{"product_id":"grp-through-wall-outlet-520mm","title":"GRP Through Wall Outlet – Parapet Drain (520mm)","description":"\u003ch3\u003eHorizontal parapet outlet for GRP flat roofing systems.\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eGRP Through Wall Outlet\u003c\/strong\u003e is a pre-formed fibreglass parapet drain designed to discharge water horizontally through a wall or upstand.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from robust GRP, it integrates directly into the laminate on the deck side and connects to rectangular 65mm x 100mm pipework externally.\u003c\/p\u003e\n\n\u003cp\u003eIts internal profile follows the \u003cstrong\u003e\u003ca href=\"\/products\/grp-wall-fillet-trim-d260-3m\"\u003eD260 Wall Fillet Trim\u003c\/a\u003e\u003c\/strong\u003e, allowing clean integration at the deck-to-wall junction.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with \u003cstrong\u003e\u003ca href=\"\/products\/restec-grp-roof-1010-base-coat-resin\"\u003eGRPROOF 1010\u003c\/a\u003e\u003c\/strong\u003e, \u003cstrong\u003e\u003ca href=\"\/products\/flexitec-resin\"\u003eFlexitec\u003c\/a\u003e\u003c\/strong\u003e, and standard polyester GRP roofing systems.\u003c\/p\u003e\n\n\u003cdetails style=\"margin-bottom:12px; border:1px solid #333; border-radius:10px; background:#1a1a1a; overflow:hidden;\"\u003e\n  \u003csummary style=\"cursor:pointer; font-weight:700; padding:16px 48px 16px 16px; font-size:18px; position:relative;\"\u003e\n    Application\n    \u003cspan style=\"position:absolute; right:16px; top:50%; transform:translateY(-50%);\"\u003e▸\u003c\/span\u003e\n  \u003c\/summary\u003e\n  \u003cdiv style=\"padding:16px; border-top:1px solid #333;\"\u003e\n    \u003cul\u003e\n      \u003cli\u003eParapet wall drainage\u003c\/li\u003e\n      \u003cli\u003eBalcony drainage where vertical outlets are not suitable\u003c\/li\u003e\n      \u003cli\u003eGRP flat roof perimeter drainage\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eUsed where water needs to drain out through a wall instead of down through the roof.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom:12px; border:1px solid #333; border-radius:10px; background:#1a1a1a; overflow:hidden;\"\u003e\n  \u003csummary style=\"cursor:pointer; font-weight:700; padding:16px 48px 16px 16px; font-size:18px; position:relative;\"\u003e\n    Why It’s Used\n    \u003cspan style=\"position:absolute; right:16px; top:50%; transform:translateY(-50%);\"\u003e▸\u003c\/span\u003e\n  \u003c\/summary\u003e\n  \u003cdiv style=\"padding:16px; border-top:1px solid #333;\"\u003e\n    \u003cp\u003eWhere gutters are not present and internal outlets are not practical, a through-wall outlet provides controlled discharge without compromising the GRP system.\u003c\/p\u003e\n\n    \u003cp\u003eUsing a GRP outlet:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eEnsures full material compatibility\u003c\/li\u003e\n      \u003cli\u003eAllows the flange to be laminated directly into the base coat\u003c\/li\u003e\n      \u003cli\u003eReduces risk of detailing failure at the drainage point\u003c\/li\u003e\n      \u003cli\u003eMaintains a consistent system build-up\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003cp\u003eThe D260-compatible internal profile ensures the laminate transitions cleanly into the outlet flange.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom:12px; border:1px solid #333; border-radius:10px; background:#1a1a1a; overflow:hidden;\"\u003e\n  \u003csummary style=\"cursor:pointer; font-weight:700; padding:16px 48px 16px 16px; font-size:18px; position:relative;\"\u003e\n    Installation Overview\n    \u003cspan style=\"position:absolute; right:16px; top:50%; transform:translateY(-50%);\"\u003e▸\u003c\/span\u003e\n  \u003c\/summary\u003e\n  \u003cdiv style=\"padding:16px; border-top:1px solid #333;\"\u003e\n    \u003cul\u003e\n      \u003cli\u003eCore or form opening through the wall to suit outlet body.\u003c\/li\u003e\n      \u003cli\u003ePosition outlet so internal flange sits flat on the deck.\u003c\/li\u003e\n      \u003cli\u003eBed in with \u003cstrong\u003e\u003ca href=\"\/products\/pu-sealant-for-grp-trims\"\u003ePU trim adhesive\u003c\/a\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n      \u003cli\u003eMechanically fix to the deck.\u003c\/li\u003e\n      \u003cli\u003eReinforce and laminate the flange joint to surrounding areas with CSM and base resin.\u003c\/li\u003e\n      \u003cli\u003eConsolidate fully to remove air pockets.\u003c\/li\u003e\n      \u003cli\u003eApply top coat as part of the system.\u003c\/li\u003e\n      \u003cli\u003eConnect external spigot to 65mm x 100mm pipework.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eEnsure correct roof falls to direct water towards the outlet.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom:12px; border:1px solid #333; border-radius:10px; background:#1a1a1a; overflow:hidden;\"\u003e\n  \u003csummary style=\"cursor:pointer; font-weight:700; padding:16px 48px 16px 16px; font-size:18px; position:relative;\"\u003e\n    Specification\n    \u003cspan style=\"position:absolute; right:16px; top:50%; transform:translateY(-50%);\"\u003e▸\u003c\/span\u003e\n  \u003c\/summary\u003e\n  \u003cdiv style=\"padding:16px; border-top:1px solid #333;\"\u003e\n    \u003cul\u003e\n      \u003cli\u003eType: Horizontal Through Wall \/ Parapet Outlet\u003c\/li\u003e\n      \u003cli\u003eLength Through Wall: Approx. 520mm\u003c\/li\u003e\n      \u003cli\u003eInternal Flange Width: Approx. 300mm\u003c\/li\u003e\n      \u003cli\u003eUpstand Height: Approx. 140mm\u003c\/li\u003e\n      \u003cli\u003ePipe Compatibility: 65mm x 100mm rectangular outlet\u003c\/li\u003e\n      \u003cli\u003eMaterial: Hot-pressed GRP\u003c\/li\u003e\n      \u003cli\u003eColour: Grey\u003c\/li\u003e\n      \u003cli\u003eCompatible With: D260 Wall Fillet Trim, GRPROOF 1010 \u0026amp; Flexitec\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom:12px; border:1px solid #333; border-radius:10px; background:#1a1a1a; overflow:hidden;\"\u003e\n  \u003csummary style=\"cursor:pointer; font-weight:700; padding:16px 48px 16px 16px; font-size:18px; position:relative;\"\u003e\n    Summary\n    \u003cspan style=\"position:absolute; right:16px; top:50%; transform:translateY(-50%);\"\u003e▸\u003c\/span\u003e\n  \u003c\/summary\u003e\n  \u003cdiv style=\"padding:16px; border-top:1px solid #333;\"\u003e\n    \u003cp\u003eThe GRP Through Wall Outlet (520mm) provides a fully compatible parapet drainage solution for fibreglass flat roofs. Designed to laminate directly into the GRP system and connect to 65mm x 100mm pipework, it delivers reliable horizontal discharge without compromising the integrity of the roof.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e","brand":"The Flat Roofing Shop","offers":[{"title":"Default Title","offer_id":56721106731339,"sku":"PG-Wall-Parapet-Outlet","price":56.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/4054\/9451\/files\/grp-through-wall-outlet.jpg?v=1774182584","url":"https:\/\/theflatroofingshop.co.uk\/products\/grp-through-wall-outlet-520mm","provider":"The Flat Roofing Shop","version":"1.0","type":"link"}