Because window sills are flat surfaces sitting external to the house, they serve as primary landing zones for rain droplets and morning dew. Over decades, if paint layers are allowed to crack and glaze sealants fail, moisture penetrates deep into the porous timber grain. Fungal spores (coniophora puteana or dry rot) flourish, eating away at the cellulose inside the wood, rendering the sill soft, spongy, and structurally compromised.<\/p>\n\n\n\n
When homeowners see spongy sills, they often assume the entire window frame is ruined and must be thrown in the rubbish. This is a costly misconception. In heritage timber restoration, we approach rotting timber with the precision of a surgeon, choosing conservation over replacement wherever possible.<\/p>\n\n\n\n
The first step of our restoration process is surgical excavation. We use specialized, sharp chisels and router tools to clean out all spongy, infected wood fibers, traveling all the way down to the solid, healthy heartwood of the original frame. We then coat the remaining sound timber with liquid chemical timber preservatives to neutralize any remaining dormant fungal spores.<\/p>\n\n\n\n
Next, we apply a low-viscosity, deep-penetrating stabilizing resin. This liquid timber consolidator is drawn into the micro-pores of the remaining timber via capillary action, binding weak wood fibers and solidifying them into a rock-hard composite block. Once this base is fully cured, we profile the missing wood sill section using high-density architectural two-part epoxy compounds. These specialized epoxies can be shaped, carved, planed, and sanded to replicate the window’s original historic profile perfectly.<\/p>\n\n\n\n
For windows where rot has consumed more than 30% of the sill depth, epoxy is insufficient. In these catastrophic cases, we practice traditional joinery splicing. Our carpenters cut out the entire decayed section using a strong, clean mortise or sliding dovetail joint. We then glue and secure a custom-machined splice of seasoned, kiln-dried old-growth WA Jarrah timber. This splice is secured with expanding polyurethane structural adhesives, leaving the new sill stronger than the original frame while maintaining the classic, clean carpentry profile.<\/p>\n","protected":false},"excerpt":{"rendered":"
Window sills and bottom timber rails bear the brunt of Perth’s coastal elements, making them highly vulnerable to decay. Before replacing entire sashes, explore how surgical wood excavation, rot-retarding resins, and Jarrah splicing can save your original timber permanently.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[22,21,20,19],"class_list":["post-103","post","type-post","status-publish","format-standard","hentry","category-rot-repair","tag-dry-rot-conservation","tag-jarrah-splicing","tag-sill-repairs","tag-wood-decay"],"_links":{"self":[{"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=\/wp\/v2\/posts\/103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=103"}],"version-history":[{"count":0,"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=\/wp\/v2\/posts\/103\/revisions"}],"wp:attachment":[{"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/melbourne.sashwindows.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}