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It outlines key joinery methods such as mortise-and-tenon with moisture-cured polyurethane glue, and explains New Zealand Building Code considerations for external moisture compliance. Detailed consent documentation items cover flashing treatments, air sealing, rough opening preparation, and construction drawings for head, sill, and jamb.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/how-to-build-guide-timber-windows/663274/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/how-to-build-guide-timber-windows/663274.png","ImageObject",300,407,{"name":92,"@type":93},"cksankcs","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What window durability does the New Zealand Building Code require for timber windows?","Question",{"text":112,"@type":113},"Timber windows are required to have a durability of not less than 15 years under the New Zealand Building Code.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What finish is recommended for exterior timber windows and why?",{"text":117,"@type":113},"Paint is recommended for exterior windows because it provides the best protection against ultraviolet light and weathering.",{"name":119,"@type":110,"acceptedAnswer":120},"Why is a building consent recommended for timber window replacement, and what compliance evidence is needed?",{"text":121,"@type":113},"Because replacement affects the external fabric of the building, obtaining a building consent is recommended. Installation is treated as an Alternative Solution, requiring demonstration that the detailing meets Building Code Clause E2 (External moisture), typically supported by detailed drawings.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},663274,1793226166,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":46},3985747882755,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","# HOW-TO-BUILD GUIDETIMBER WINDOWS\n\n## WHAT YOU CAN BUILD USING THIS GUIDE\n\nThis guide shows you how to install a factory-made timber casement window into a house with a weatherboardclading.Casement windows typicallyhave side hung (outward opening)sashes and may incorporate a fan light ortop light opening sash.  \nBEFORE YOU BEGIN  \nYou need to consider the durability required of the window and the timber species you choose,construction typeand finish.  \nUnder the New Zealand Bulding Code,windows are required to have a durability of not less than 15 years.  \nTimber windows in New Zealand have traditionally been made from locally grown softwoods such as:rimu(frames),matai (sil),totara and kauri(sashes),and Californian redwood.As native timbers have become increasingly scarce,other timbers have come into common usage such as:  \n·western red cedar (imported)  \n·pinus radiata(both clears and finger-jointed,the latter for paint finish only)  \n·cypress species such as macrocarpa,Mexican cypress,and Lawson's cypress  \n·kwila(imported).  \nA combination of timbers may be used in a window,for example,western red cedar for sashes and pine for framesand sill.The choice of material is largely determined by the type of finish required and the degree of exposure ofthe window.Joinery will perform better when made from a stable and durable timber such as western red cedar.  \n## Window construction\n\nMortise and tenon joints are still used as the primary sash stile-to-rail joint for most window types.This involves atenon,or tongue,from the rail being fitted,glued and pinned into a slot in the stile (Figure 1).  \nMoisture-cured polyurethane glue,which has good water resistance and retains its flexibility,is generally used forwindow joints.  \n## Decorative finish\n\nPaint is the recommended finish for exterior windows as it affords the best protection against the effects ofultraviolet light and weathering generally.Semi-transparent and transparent finishes (stains)have limited durability.  \n## BUILDING CODE CONSIDERATIONS\n\nWhen replacement of a timber window becomes necessary,it has to be done to comply with the performancerequirements of the Building Code.The replacement of a window affects the external fabric of the building andobtaining a building consent is recommended.  \nTimber window installation is not covered by Building Code compliance document E2/AS1 and must be consentedas an Alternative Solution.This means that you must demonstrate to your local building consent authority that thedetail meets the performance requirements of Building Code Clause E2 External moisture.  \nProvided the existing window has given good service in its setting for years,the replacement by the same detailing(together with the modifications suggested in the Figures)can be used to show compliance with Clause E2.  \nTo obtain a building consent it will be necessary to provide detailed drawings.It is usual to provide scale drawingsof the head,sill and jamb,similar to Figures 5,6,and 7.  \n## DOCUMENTING THE ALTERNATIVE SOLUTION\n\nThe following aspects of the replacement window will need to be detailed for consent:  \n·the treatment of the rough opening to follow the principles of window detailing in E2/AS1  \n·sill tray flashing  \n·window head detailing  \n·perimeter air seal.  \nDesigns to E2/AS1 require the wall underlay to be dressed into all framed openings to protect the timber fromany moisture that may get through the other lines of defence.When replacing an existing window this will not becompletely possible,however flexible flashing tape must be installed:  \n● at corners of the window head  \n·over the full width of the sill and turned up 100mm at both sides,and  \n·carried 50 mm down the external face of the cladding  \nUnder E2/AS1,where the cladding is direct-fixed,a full-width sill tray should be fitted.The il tray must have  \n·a minimum 5°slope  \n·stop-ends lapped under the jamb packers.  \nHead flashings under E2/AS1 must have:  \n● a minimum 15°cross fall  \n·a minimu","cbCaidk7LniiVB6v","https://ap.wps.com/l/cbCaidk7LniiVB6v","pdf",1605901,"English","# What you can build using this guide\n# Window construction\n# Decorative finish\n# Building code considerations\n# Documenting the alternative solution\n# HOW-TO-BUILD GUIDE TIMBER WINDOWS (CONTD)\n## Replacement of a timber window in an existing opening\n## Ordering the new window\n## Removal of the existing window","[{\"question\":\"What window durability does the New Zealand Building Code require for timber windows?\",\"answer\":\"Timber windows are required to have a durability of not less than 15 years under the New Zealand Building Code.\"},{\"question\":\"What finish is recommended for exterior timber windows and why?\",\"answer\":\"Paint is recommended for exterior windows because it provides the best protection against ultraviolet light and weathering.\"},{\"question\":\"Why is a building consent recommended for timber window replacement, and what compliance evidence is needed?\",\"answer\":\"Because replacement affects the external fabric of the building, obtaining a building consent is recommended. Installation is treated as an Alternative Solution, requiring demonstration that the detailing meets Building Code Clause E2 (External moisture), typically supported by detailed drawings.\"}]","HOW-TO-BUILD GUIDE TIMBER WINDOWS | PDF"]