{"id":2627,"date":"2026-01-19T15:33:21","date_gmt":"2026-01-19T15:33:21","guid":{"rendered":"https:\/\/www.millboard.com\/en-gb\/?p=2627"},"modified":"2026-01-22T21:58:02","modified_gmt":"2026-01-22T21:58:02","slug":"composite-decking-joists","status":"publish","type":"post","link":"https:\/\/www.millboard.com\/en-us\/latest-news\/composite-decking-joists\/","title":{"rendered":"Composite Decking Joists\u00a0"},"content":{"rendered":"\n<p>The Ultimate Guide to Composite Decking Joists: Everything You Need to Know for a Lasting Deck&nbsp;<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>If you&#8217;re investing in composite decking, don&#8217;t overlook one of the most critical components: the <a href=\"https:\/\/www.millboard.com\/en-us\/en-gb\/2026\/01\/19\/your-guide-to-choosing-the-best-subframe-for-your-deck\/\">subframe<\/a>. While the decking boards steal the spotlight with their aesthetics and tactile appeal, it\u2019s the joists and substructure beneath that truly determine the longevity, performance, and safety of your outdoor space. This guide explores everything you need to know about composite decking joists \u2014 their types, materials, spacing, installation methods, and how they pair with premium decking like Millboard.&nbsp;<\/p>\n\n\n<section aria-label=\"DuoSpan\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"543\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Framework-Image_Large-Joist-Structure-768x543.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Framework-Image_Large-Joist-Structure-768x543.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Framework-Image_Large-Joist-Structure-300x212.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Framework-Image_Large-Joist-Structure-1024x724.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Framework-Image_Large-Joist-Structure-600x424.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Framework-Image_Large-Joist-Structure.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-what-are-decking-joists-nbsp\">What Are Decking Joists?&nbsp;<\/h3>\n\n\n\n<p>Decking joists are horizontal support elements fixed atop posts or beams to create the framework on which decking boards are laid. Their primary role is to distribute weight evenly, resist movement, and ensure structural stability. For composite decking, choosing the right joist material and layout is vital to achieving a deck that lasts for decades with minimal maintenance.&nbsp;<\/p>\n\n\n\n<p><\/p>\n\n\n<section aria-label=\"Plaspro\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Decking-Enhanced-Grain-Antique-Oak-3-15.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Decking-Enhanced-Grain-Antique-Oak-3-15.webp 640w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Decking-Enhanced-Grain-Antique-Oak-3-15-300x225.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Decking-Enhanced-Grain-Antique-Oak-3-15-600x450.webp 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-why-the-subframe-matters-nbsp\">Why the Subframe Matters&nbsp;<\/h3>\n\n\n\n<p>The subframe is the silent hero of any decking project. A poor-quality or incorrectly installed subframe can lead to costly problems: sagging boards, unsafe movement, moisture retention, and even structural failure. Given that composite decking is designed to outlast traditional timber, your joists need to match or exceed that longevity to avoid premature deck failure.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-joist-material-options-nbsp\">Joist Material Options&nbsp;<\/h3>\n\n\n\n<p>Timber vs Recycled Plastic vs Aluminium&nbsp;<\/p>\n\n\n\n<p><\/p>\n\n\n<section aria-label=\"Timber\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"576\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Subframe_Timber-768x576.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Subframe_Timber-768x576.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Subframe_Timber-300x225.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Subframe_Timber-600x450.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Subframe_Timber.webp 800w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-treated-timber-joists-nbsp\">Treated Timber Joists&nbsp;<\/h3>\n\n\n\n<p>Softwood timber is a common, cost-effective option. However, it\u2019s only suitable if treated to Use Class 4, especially in ground contact or moisture-prone environments. Even with treatment, timber remains susceptible to rot, warping, and insect damage over time.&nbsp;<\/p>\n\n\n\n<p>Pros: Inexpensive, widely available, familiar to tradespeople.&nbsp;<\/p>\n\n\n\n<p>Cons: Requires airflow and proper drainage, vulnerable to moisture and decay if incorrectly specified.&nbsp;<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n<section aria-label=\"Plas Pro\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"square\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"768\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-768x768.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-768x768.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-300x300.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-1024x1024.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-150x150.webp 150w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-1575x1575.webp 1575w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-600x600.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1-100x100.webp 100w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-plas-pro-recycled-plastic-joists-nbsp\">Plas-Pro Recycled Plastic Joists&nbsp;<\/h3>\n\n\n\n<p>Plas-Pro joists are made from 100% recycled plastic, offering a rot-proof, moisture-resistant alternative. They are ideal for wet environments such as roof terraces, boardwalks, and pool surrounds.&nbsp;<\/p>\n\n\n\n<p>Pros: Maintenance-free, impervious to rot, usable in damp conditions, environmentally friendly.&nbsp;<\/p>\n\n\n\n<p>Cons: Heavier than timber, lower strength-to-weight ratio, needs closer joist spacing (300\u2013400mm centres).&nbsp;<\/p>\n\n\n<section aria-label=\"DuoSpan\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"346\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Roof-Terrace-3-768x346.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Roof-Terrace-3-768x346.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Roof-Terrace-3-300x135.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Roof-Terrace-3-600x270.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan-Roof-Terrace-3.webp 800w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h2 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-duospan-aluminium-joists-nbsp\">DuoSpan Aluminium Joists&nbsp;<\/h2>\n\n\n\n<p>The pinnacle of decking subframes. DuoSpan combines rigid aluminum with flexible recycled plastic components, enabling precision installations, strength, and complex designs such as curves, cantilevers, and floating decks.\u00a0<\/p>\n\n\n\n<p>Pros: Lifetime durability, moisture-immune, no warping or twisting, incredibly straight for quick installation.&nbsp;<\/p>\n\n\n\n<p>Cons: Higher upfront cost, but offers unbeatable long-term value.&nbsp;<\/p>\n\n\n<section aria-label=\"PlasPro\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"square\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"768\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-768x768.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-768x768.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-300x300.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1024x1024.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-150x150.webp 150w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-1575x1575.webp 1575w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-600x600.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6-100x100.webp 100w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Decking-Enhanced-Grain-Golden-Oak-Dell-Park-6.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-recommended-joist-spacing-nbsp\">Recommended Joist Spacing&nbsp;<\/h3>\n\n\n\n<p>Joist spacing should match the application and deck board orientation:&nbsp;<\/p>\n\n\n\n<p>If using Millboard decking boards (e.g., Enhanced Grain or Weathered Oak), always ensure the boards are supported by a minimum of three joists, particularly where cut sections are used.&nbsp;<\/p>\n\n\n<section aria-label=\"Base\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"512\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/PMCP010-DuoLift_Joist_Cradle_laid-out.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/PMCP010-DuoLift_Joist_Cradle_laid-out.webp 2048w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/PMCP010-DuoLift_Joist_Cradle_laid-out-300x200.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/PMCP010-DuoLift_Joist_Cradle_laid-out-1024x683.webp 1024w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-installing-joists-key-considerations-nbsp\">Installing Joists: Key Considerations&nbsp;<\/h3>\n\n\n\n<p><strong>Ventilation:<\/strong> Timber joists require airflow under and around the structure. Plas-Pro and DuoSpan do not.&nbsp;<\/p>\n\n\n\n<p><strong>Fall Gradient:<\/strong> A slight fall of 1:200 away from buildings is advised to aid water drainage.&nbsp;<\/p>\n\n\n\n<p><strong>Gapping:<\/strong> Boards need a 4mm side gap (6mm with DuoFix), and a 1mm end gap. Allow 10mm against walls or abutting structures for expansion.&nbsp;<\/p>\n\n\n\n<p><strong>Fixings<\/strong>: Use only Durafix screws for Millboard products. These fasten through the face with a \u2018lost-head\u2019 finish, or use the DuoFix side-fixing system for clean line&nbsp;<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n<section aria-label=\"DuoLift\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"512\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan_Installation-Image-2-768x512.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan_Installation-Image-2-768x512.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan_Installation-Image-2-300x200.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan_Installation-Image-2-1024x683.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan_Installation-Image-2-600x400.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/DuoSpan_Installation-Image-2.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-elevation-and-level-control-duolift-pedestal-system-nbsp\">Elevation and Level Control: DuoLift Pedestal System&nbsp;<\/h3>\n\n\n\n<p>Where height adjustment is needed \u2014 such as roof terraces or uneven patios \u2014 the <a href=\"https:\/\/www.millboard.com\/en-us\/en-gb\/2026\/01\/19\/introducing-duospan-and-duolift-engineered-for-strength-and-design-versatility\/\">DuoLift<\/a> system simplifies subframe installation. With components stacking from 15mm up to 350mm, it ensures level, precise deck builds without compromising strength.&nbsp;<\/p>\n\n\n<section aria-label=\"Sustainability\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"587\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_MDW200R_Weathered-Oak_Embered_Project-Imagery_Kew-Childrens-Garden-1-768x587.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_MDW200R_Weathered-Oak_Embered_Project-Imagery_Kew-Childrens-Garden-1-768x587.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_MDW200R_Weathered-Oak_Embered_Project-Imagery_Kew-Childrens-Garden-1-300x229.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_MDW200R_Weathered-Oak_Embered_Project-Imagery_Kew-Childrens-Garden-1-1024x783.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_MDW200R_Weathered-Oak_Embered_Project-Imagery_Kew-Childrens-Garden-1-600x459.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_MDW200R_Weathered-Oak_Embered_Project-Imagery_Kew-Childrens-Garden-1.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-sustainability-benefits-nbsp\">Sustainability Benefits&nbsp;<\/h3>\n\n\n\n<p>Millboard subframes, especially Plas-Pro and DuoSpan, reflect our commitment to <a href=\"https:\/\/www.millboard.com\/en-us\/en-gb\/2026\/01\/20\/how-millboard-products-support-principles-sustainable-drainage-systems-suds\/\">sustainable innovation<\/a>:&nbsp;<\/p>\n\n\n\n<p>Made from recycled materials.&nbsp;<\/p>\n\n\n\n<p>Designed to last decades without degradation.&nbsp;<\/p>\n\n\n\n<p>Require no chemical treatments, paints, or preservatives.&nbsp;<\/p>\n\n\n\n<p>This durability translates to less waste, fewer replacements, and a lower carbon footprint over the lifetime of your outdoor space.&nbsp;<\/p>\n\n\n<section aria-label=\"Enhanced Grain\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"512\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/X8A7830-Modifier-768x512.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/X8A7830-Modifier-768x512.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/X8A7830-Modifier-300x200.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/X8A7830-Modifier-1024x683.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/X8A7830-Modifier-600x400.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/X8A7830-Modifier.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-summary-which-joist-type-is-right-for-you-nbsp\">Summary: Which Joist Type Is Right for You?&nbsp;<\/h3>\n\n\n<section aria-label=\"Enhanced Grain Coppered Oak\"  style=\"--gallery--items-count: 1;\" class=\"gallery wp-block alignfull\">\n    <div class=\"gallery__list__wrapper\">\n        <ul class=\"gallery__list list-reset--hard\">\n                        <li data-pattern-part=\"100\" data-image-orientation=\"landscape\" style=\"--gallery--card--column: 1 \/ 13;\" class=\"gallery__card\">\n                <div class=\"gallery__card__inner img-fit\">\n                    \n                    <img decoding=\"async\" width=\"768\" height=\"494\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176C-Case-Study_Enhanced-Grain_Coppered-Oak_Wooddeck_BPB-_dsc9793-768x494.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176C-Case-Study_Enhanced-Grain_Coppered-Oak_Wooddeck_BPB-_dsc9793-768x494.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176C-Case-Study_Enhanced-Grain_Coppered-Oak_Wooddeck_BPB-_dsc9793-300x193.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176C-Case-Study_Enhanced-Grain_Coppered-Oak_Wooddeck_BPB-_dsc9793-1024x659.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176C-Case-Study_Enhanced-Grain_Coppered-Oak_Wooddeck_BPB-_dsc9793-600x386.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176C-Case-Study_Enhanced-Grain_Coppered-Oak_Wooddeck_BPB-_dsc9793.webp 2048w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>                <\/div>\n                <div class=\"gallery__card__caption is-style-typestyle-small is-style-typestyle-meta\">\n                    <div class=\"gallery__card__caption-main\">\n                                            <\/div>\n\n                                    <\/div>\n            <\/li>\n        \n            <\/ul>\n    <\/div>\n\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading is-style-typestyle-uppercase\" id=\"h-build-your-deck-to-last-nbsp\">Build Your Deck to Last&nbsp;<\/h3>\n\n\n\n<p>At Millboard, we believe every element of your decking \u2014 from the visible surface to the hidden framework \u2014 should embody quality, resilience, and design excellence. Whether you&#8217;re enhancing a home garden, constructing a rooftop terrace, or designing a commercial boardwalk, the right joist system makes all the difference.&nbsp;<\/p>\n\n\n\n<p>Ready to start your project? Find an Approved Installer or contact us for technical support and expert advice.&nbsp;<\/p>\n\n\n<section class=\"cards-automatic cards wp-block animate alignfull alignwide has-background has-brand-2-background-color\">\n    <div class=\"cards__inner\" style=\"--cards--best-column-fit: 3;\">\n        \n        <div class=\"cards__items\">\n                            <div data-type=\"post\" class=\"media-object g-card animate-element\" data-media=\"image\" data-link=\"true\" data-media-type=\"image\" data-media-position=\"before\" data-orientation=\"vertical\">\n    <div class=\"media-object__inner\">\n                <div class=\"media-object__media img-fit \">\n\n                                                            <div class=\"media-object__media--hover-effect\">\n                            <span class=\"media-object__media--hover-effect__top\">\n                                View                            <\/span>\n\n                            <span class=\"media-object__media--hover-effect__bottom\">\n                                Article                            <\/span>\n                        <\/div>\n                    \n                    <img decoding=\"async\" width=\"300\" height=\"206\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176H_Enhanced-Grain_Ashwood_Golden-Oak-Mix_Lifestyle-hero-1-300x206.jpg\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176H_Enhanced-Grain_Ashwood_Golden-Oak-Mix_Lifestyle-hero-1-300x206.jpg 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176H_Enhanced-Grain_Ashwood_Golden-Oak-Mix_Lifestyle-hero-1-1024x701.jpg 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176H_Enhanced-Grain_Ashwood_Golden-Oak-Mix_Lifestyle-hero-1-768x526.jpg 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176H_Enhanced-Grain_Ashwood_Golden-Oak-Mix_Lifestyle-hero-1-600x411.jpg 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/MDE176H_Enhanced-Grain_Ashwood_Golden-Oak-Mix_Lifestyle-hero-1.jpg 2000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\n                                                <\/div>\n        \n        <div class=\"media-object__content flex-column\">\n            \n            \n                            <div class=\"media-object__header flex-column\">\n                                            <h2 id=\"millboard-expands-global-presence-with-acquisition-of-leading-french-distributor\" class=\"media-object__heading\"><a href=\"https:\/\/www.millboard.com\/en-us\/latest-news\/millboard-expands-global-presence-with-acquisition-of-leading-french-distributor\/\">Millboard Expands Global Presence with Acquisition of Leading French Distributor\u00a0<\/a><\/h2>\n                    \n                     \n                                    <\/div>\n            \n            \n            \n                    <\/div>\n\n            <\/div>\n\n<\/div>\n                            <div data-type=\"post\" class=\"media-object g-card animate-element\" data-media=\"image\" data-link=\"true\" data-media-type=\"image\" data-media-position=\"before\" data-orientation=\"vertical\">\n    <div class=\"media-object__inner\">\n                <div class=\"media-object__media img-fit \">\n\n                                                            <div class=\"media-object__media--hover-effect\">\n                            <span class=\"media-object__media--hover-effect__top\">\n                                View                            <\/span>\n\n                            <span class=\"media-object__media--hover-effect__bottom\">\n                                Article                            <\/span>\n                        <\/div>\n                    \n                    <img decoding=\"async\" width=\"300\" height=\"169\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Remarkable-Renovation_Livingroom4-300x169.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Remarkable-Renovation_Livingroom4-300x169.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Remarkable-Renovation_Livingroom4-1024x576.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Remarkable-Renovation_Livingroom4-768x432.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Remarkable-Renovation_Livingroom4-600x338.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Case-Study_Remarkable-Renovation_Livingroom4.webp 1920w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\n                                                <\/div>\n        \n        <div class=\"media-object__content flex-column\">\n            \n            \n                            <div class=\"media-object__header flex-column\">\n                                            <h2 id=\"millboard-features-in-a-remarkable-renovation\" class=\"media-object__heading\"><a href=\"https:\/\/www.millboard.com\/en-us\/latest-news\/millboard-features-in-a-remarkable-renovation\/\">Millboard features in a \u2018Remarkable Renovation\u2019\u2026\u00a0<\/a><\/h2>\n                    \n                     \n                                    <\/div>\n            \n            \n            \n                    <\/div>\n\n            <\/div>\n\n<\/div>\n                            <div data-type=\"post\" class=\"media-object g-card animate-element\" data-media=\"image\" data-link=\"true\" data-media-type=\"image\" data-media-position=\"before\" data-orientation=\"vertical\">\n    <div class=\"media-object__inner\">\n                <div class=\"media-object__media img-fit \">\n\n                                                            <div class=\"media-object__media--hover-effect\">\n                            <span class=\"media-object__media--hover-effect__top\">\n                                View                            <\/span>\n\n                            <span class=\"media-object__media--hover-effect__bottom\">\n                                Article                            <\/span>\n                        <\/div>\n                    \n                    <img decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-300x300.webp\" class=\"\" alt=\"\" role=\"presentation\" loading=\"lazy\" srcset=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-300x300.webp 300w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-1024x1024.webp 1024w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-150x150.webp 150w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-768x768.webp 768w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-600x600.webp 600w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect-100x100.webp 100w, https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Social-Content_BBC-Your-Garden-Made-Perfect.webp 1080w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\n                                                <\/div>\n        \n        <div class=\"media-object__content flex-column\">\n            \n            \n                            <div class=\"media-object__header flex-column\">\n                                            <h2 id=\"millboard-featured-on-bbcs-your-garden-made-perfect\" class=\"media-object__heading\"><a href=\"https:\/\/www.millboard.com\/en-us\/latest-news\/millboard-featured-bbcs-your-garden-made-perfect\/\">Millboard featured on BBC\u2019s \u2018Your Garden Made Perfect\u2019\u00a0<\/a><\/h2>\n                    \n                     \n                                    <\/div>\n            \n            \n            \n                    <\/div>\n\n            <\/div>\n\n<\/div>\n                    <\/div>\n\n            <\/div>\n<\/section>\n\n\n<div class=\"navigation-tiles wp-block alignfull has-background has-brand-6-background-color\">\n    <div class=\"navigation-tiles__inner\">\n                    <div class=\"navigation-tiles__header\">\n                                \n                                    <h2 id=\"planning-your-next-project\" class=\"navigation-tiles__heading\">\n                        Planning Your Next Project?                    <\/h2>\n                            <\/div>\n        \n                    <div class=\"navigation-tiles__tiles\">\n                                    <div class=\"navigation-tiles__tile\">\n                                                    <h3 class=\"navigation-tiles__tile-title\">\n                                Decking configurator                            <\/h3>\n                                                \n                                                    <div class=\"navigation-tiles__tile-description\">\n                                <p>Estimate the boards, fixings, subframe and more you need for your space.<\/p>\n                            <\/div>\n                                                \n                                                    <a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/deckplanner.www.millboard.com\/#\/\" class=\"navigation-tiles__tile-cta g-button\">Open Configurator<\/a>\n                                            <\/div>\n                                    <div class=\"navigation-tiles__tile\">\n                                                    <h3 class=\"navigation-tiles__tile-title\">\n                                Design consultation                            <\/h3>\n                                                \n                                                    <div class=\"navigation-tiles__tile-description\">\n                                <p>Get one to one guidance on layouts, colours and details.<\/p>\n                            <\/div>\n                                                \n                                                    <a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.millboard.com\/en-gb\/request-a-consultation\/\" class=\"navigation-tiles__tile-cta g-button\">Book a consultation<\/a>\n                                            <\/div>\n                                    <div class=\"navigation-tiles__tile\">\n                                                    <h3 class=\"navigation-tiles__tile-title\">\n                                Installation guides                            <\/h3>\n                                                \n                                                    <div class=\"navigation-tiles__tile-description\">\n                                <p>Step by step fixing advice and detailing for every collection.<\/p>\n                            <\/div>\n                                                \n                                                    <a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/www.millboard.com\/en-gb\/product-brochures\/\" class=\"navigation-tiles__tile-cta g-button\">Browse Guides<\/a>\n                                            <\/div>\n                                    <div class=\"navigation-tiles__tile\">\n                                                    <h3 class=\"navigation-tiles__tile-title\">\n                                Free product samples                            <\/h3>\n                                                \n                                                    <div class=\"navigation-tiles__tile-description\">\n                                <p>Order some samples to see how Millboard works for your project<\/p>\n                            <\/div>\n                                                \n                                                    <a target=\"_blank\" rel=\"noopener\" href=\"#\" class=\"navigation-tiles__tile-cta g-button\">Order Samples Today<\/a>\n                                            <\/div>\n                            <\/div>\n            <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Ultimate Guide to Composite Decking Joists: Everything You Need to Know for a Lasting Deck&nbsp; If you&#8217;re investing in&hellip;<\/p>\n","protected":false},"author":10,"featured_media":3413,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[21,24,52,53,1],"tags":[],"class_list":["post-2627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-decking","category-enhanced-grain","category-plas-pro","category-subframe","category-uncategorised"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Composite Decking Joists Explained<\/title>\n<meta name=\"description\" content=\"Learn what composite decking joists are, why they matter, and how they support a durable, long-lasting deck. Get expert tips for choosing the right joist system with Millboard.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.millboard.com\/en-us\/latest-news\/composite-decking-joists\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Composite Decking Joists\u00a0\" \/>\n<meta property=\"og:description\" content=\"Learn what composite decking joists are, why they matter, and how they support a durable, long-lasting deck. Get expert tips for choosing the right joist system with Millboard.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.millboard.com\/en-us\/latest-news\/composite-decking-joists\/\" \/>\n<meta property=\"og:site_name\" content=\"EN-US - Residential\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-19T15:33:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-22T21:58:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.millboard.com\/en-us\/wp-content\/uploads\/sites\/5\/2026\/01\/Installation_Plas-Pro-Over-Water.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"975\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"aarondavis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"aarondavis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/\"},\"author\":{\"name\":\"aarondavis\",\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/#\\\/schema\\\/person\\\/48ac4f8bce57c40784e61a98af7ed01b\"},\"headline\":\"Composite Decking Joists\u00a0\",\"datePublished\":\"2026-01-19T15:33:21+00:00\",\"dateModified\":\"2026-01-22T21:58:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/\"},\"wordCount\":735,\"image\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/wp-content\\\/uploads\\\/sites\\\/5\\\/2026\\\/01\\\/Installation_Plas-Pro-Over-Water.webp\",\"articleSection\":[\"Decking\",\"Enhanced Grain\",\"Plas-Pro\",\"Subframe\",\"Uncategorised\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/\",\"url\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/\",\"name\":\"Composite Decking Joists Explained\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/latest-news\\\/composite-decking-joists\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/wp-content\\\/uploads\\\/sites\\\/5\\\/2026\\\/01\\\/Installation_Plas-Pro-Over-Water.webp\",\"datePublished\":\"2026-01-19T15:33:21+00:00\",\"dateModified\":\"2026-01-22T21:58:02+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.millboard.com\\\/en-us\\\/#\\\/schema\\\/person\\\/48ac4f8bce57c40784e61a98af7ed01b\"},\"description\":\"Learn what composite decking joists are, why they matter, and how they support a durable, long-lasting deck. 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