{"id":36100,"date":"2026-03-31T12:27:07","date_gmt":"2026-03-31T12:27:07","guid":{"rendered":"https:\/\/leadworx.innuvo-dev.co.uk\/uncategorized-ie\/window-tray\/"},"modified":"2026-03-31T12:27:07","modified_gmt":"2026-03-31T12:27:07","slug":"window-tray","status":"publish","type":"post","link":"https:\/\/www.leadworx.com\/ie\/leadwork-guides\/window-tray\/","title":{"rendered":"Lead Window Tray Flashings: Types, Sizes &amp; Installation Guide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Introduction:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where windows meet exterior walls, particularly on dormer builds, the risk rises. Water can track behind the window frame, slip behind the cladding, and end up soaking into the timber structure below. It&#8217;s a detail that&#8217;s easy to overlook. Mistakes here go unnoticed early yet lead to serious damage later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A window tray flashing is the component designed to stop that happening. If you&#8217;re building or specifying a dormer or clad wall, understanding how this piece works, and which type you need, can save time, money, and future repairs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a window tray flashing?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A window tray flashing is a pre-formed lead tray that sits beneath a window where it meets a clad external wall, most commonly on a dormer, but also on any timber-framed structure clad with slates, tiles, shiplap or similar. Its job is to collect any water that gets behind the window frame and direct it away from the structure, turning it over the face of the cladding below rather than letting it soak in.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical design<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A standard window tray flashing includes:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 A flat base that sits beneath the window<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Upstands at the back and sides to contain water<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 A front lip that laps down over the cladding<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Material specification<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Code 4 lead is the industry standard for this application, thick enough for durability, flexible enough for forming<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Manufactured to BS EN 12588 for consistency and quality<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Overlap requirements<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Where sections join, a minimum 100mm overlap is required<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 This ensures continuity and maintains watertight performance<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where are window tray flashings needed?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Trays are frequently necessary when dealing with dormer windows, specifically dormers clad in slates, tiles, or boards rather than rendered or tiled all the way around.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However they&#8217;re not limited to just dormers, any window set into a clad stud wall construction at roof level can need one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What about masonry construction?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In traditional brick or block construction, this aspect is addressed through specific methods:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Cavity trays<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Damp proof courses (DPCs)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yet when dealing with timber frames alongside cladding, a window tray remains the usual choice, trusted, steady in performance. Its track record stands firm.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Full length, halves, or tray ends: which do you need?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Leadworx supply three types of window tray:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Full length window tray<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>A single piece<\/strong> spanning the full width of the window<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 No joints, fewer potential failure points<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Simplest to install<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical spec:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 150mm cill depth<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 150mm front cover lap<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Standard-width openings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Jobs where handling a single piece is practical<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Window tray halves<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Supplied as <strong>two sections<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Joined at the centre with a <strong>minimum 100mm overlap<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why use them?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Easier to handle on wider openings where the opening is wider than a practical single piece<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Useful where site access is restricted<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Same spec as full length, just split for practicality<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Window tray ends (pair)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Supplied as <strong>left and right end<\/strong> sections only<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The central flat section is formed on site from lead sheet by a roofer<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Traditional roofing workflows<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Roofers comfortable dressing lead<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Projects where flexibility is needed on site<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The ends handle the <strong>most complex part (corners and upstands)<\/strong>, while the centre is cut and fitted to suit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>All three options are:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Made from <strong>Code 4 lead<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Compliant with <strong>BS EN 12588<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Manufactured in Cornwall<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Available in standard and bespoke sizes. Leadworx often makes bespoke trays with a welded rear upstand.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key installation points to be aware of<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Getting the installation right is what makes a window tray flashing actually do its job. These are the core details that matter on site:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Maintain minimum 100mm overlap where sections join. This is essential for maintaining a continuous watertight barrier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Tray must turn up behind the window frame (not just sit under it) to form a watertight upstand. This is essential to stop water running back into the building.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Front ledge of the tray should turn down over the face of the cladding, and extend to cover fixings and the cladding edge<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Avoid fixing the window frame directly through the lead tray.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <a href=\"https:\/\/leadsheet.co.uk\/\">The Lead Sheet Association <\/a>guidance should be followed for full specification detail <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Bespoke sizes are available if standard sizes don&#8217;t fit the opening<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common mistakes to avoid<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Undersizing the tray<\/strong>: You need enough depth (typically 150mm) to form a proper upstand. Undersized trays are one of the most common causes of failure. Measure twice!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Insufficient overlap:<\/strong> 100mm is the minimum; more is safer<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Poor front detailing:<\/strong> The front edge must extend far enough to cover cladding fixings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Fabricating from flat sheet when pre-formed trays are available<\/strong>: Pre-formed trays save time and reduce the risk of weak corners<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Conclusion<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Finding the correct window tray flashing comes down to a practical decision:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Full length<\/strong> for simplicity and speed<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022<strong> Halves<\/strong> for wider openings or easier handling<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 <strong>Ends <\/strong>for traditional, on-site formed solutions<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">All achieve the same goal of blocking water, but the correct type makes installation smoother and more reliable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A bespoke tray might work better if your space is unusual. When measurements fall outside of typical ranges, custom options may be necessary. Bespoke trays can be made to order, ensuring a proper fit and performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next step: Explore the <a href=\"https:\/\/www.leadworx.com\/product-category\/window-trays\/\">Window Trays range<\/a> to find the right configuration for your project<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction: Where windows meet exterior walls, particularly on dormer builds, the risk rises. Water can track behind the window frame, slip behind the cladding, and end up soaking into the timber structure below. It&#8217;s a detail that&#8217;s easy to overlook. Mistakes here go unnoticed early yet lead to serious damage later. A window tray flashing [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":36101,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[440],"tags":[],"class_list":["post-36100","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-leadwork-guides"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lead Window Tray Flashings: Types, Sizes &amp; Installation Guide<\/title>\n<meta name=\"description\" content=\"Introduction: Where windows meet exterior walls, particularly on dormer builds, the risk rises. 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