{"product_id":"c3-grp-external-wall-fillet-corner","title":"C3 GRP External Wall Fillet Corner","description":"\u003ch3\u003ePre-formed fibreglass corner for neat external wall-to-wall and upstand junctions\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eC3 GRP External Wall Fillet Corner\u003c\/strong\u003e is a hot-pressed, pre-formed fibreglass corner designed for use where two wall fillet trims meet at an external 90° corner.\u003c\/p\u003e\n\n\u003cp\u003eIt is commonly used at \u003cstrong\u003eexternal wall junctions\u003c\/strong\u003e and at the base corners of \u003cstrong\u003eskylight and rooflight upstands\u003c\/strong\u003e, creating a clean, uniform finish without the need to mitre or hand-form trims on site.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with \u003cstrong\u003e\u003ca href=\"\/products\/grp-wall-fillet-trim-d260-3m\"\u003eD260 fillet trim\u003c\/a\u003e\u003c\/strong\u003e profiles.\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    What It’s Used For\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\u003eForming external 90° wall-to-wall fillet corners\u003c\/li\u003e\n      \u003cli\u003eCreating neat base corners on skylight upstands\u003c\/li\u003e\n      \u003cli\u003eJoining D260 fillet trims at external junctions\u003c\/li\u003e\n      \u003cli\u003eReplacing site-cut mitred fillet corners\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eDesigned specifically for GRP roofing systems where detail quality and consistency matter.\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 Matters\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\u003eExternal fillet corners are high-visibility and high-movement areas within a GRP roof system.\u003c\/p\u003e\n\n    \u003cp\u003eHand-cut mitred fillet trims can:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eLook uneven\u003c\/li\u003e\n      \u003cli\u003eCreate inconsistent angles\u003c\/li\u003e\n      \u003cli\u003eTake longer to install\u003c\/li\u003e\n      \u003cli\u003eRequire additional finishing\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003cp\u003eA pre-formed C3 corner:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eSpeeds up installation\u003c\/li\u003e\n      \u003cli\u003eEnsures consistent 90° geometry\u003c\/li\u003e\n      \u003cli\u003eDelivers a cleaner, more professional finish\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003cp\u003eOnce laminated and top coated, it produces a seamless and professional external junction.\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    \u003col\u003e\n      \u003cli\u003ePosition the C3 corner and mechanically fix to the deck (each end and centrally).\u003c\/li\u003e\n      \u003cli\u003eApply a thin bead of \u003cstrong\u003e\u003ca href=\"\/products\/pu-sealant-for-grp-trims\"\u003ePU trim adhesive\u003c\/a\u003e\u003c\/strong\u003e at trim junctions.\u003c\/li\u003e\n      \u003cli\u003eFit adjoining D260 fillet trims into place.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/products\/grp-taping-mat-75mm\"\u003eBandage\u003c\/a\u003e\u003c\/strong\u003e the joint using taping mat and wet out with base resin.\u003c\/li\u003e\n      \u003cli\u003eUse finishing tissue if required for a smooth edge.\u003c\/li\u003e\n      \u003cli\u003eTop coat as part of the GRP system.\u003c\/li\u003e\n    \u003c\/ol\u003e\n    \u003cp\u003eEnsure all surfaces are clean and dry prior to bonding and laminating.\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    Technical 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    \u003cp\u003e\u003cstrong\u003eType:\u003c\/strong\u003e C3 External Wall Fillet Corner\u003cbr\u003e\n    \u003cstrong\u003eMaterial:\u003c\/strong\u003e Hot press moulded GRP\u003cbr\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e D260 Fillet Trim\u003cbr\u003e\n    \u003cstrong\u003eUse:\u003c\/strong\u003e External wall-to-wall fillet junctions and upstand base corners\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    Roofer’s Perspective\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\u003eExternal wall corners and skylight bases are where messy mitres show up. A moulded C3 corner keeps the junction sharp and uniform without having to cut and shape fillets on site.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e","brand":"The Flat Roofing Shop","offers":[{"title":"Default Title","offer_id":56660352532811,"sku":"PG-C3-Ext-Wall","price":13.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/4054\/9451\/files\/c3-external-corner-grp.jpg?v=1774110737","url":"https:\/\/theflatroofingshop.co.uk\/products\/c3-grp-external-wall-fillet-corner","provider":"The Flat Roofing Shop","version":"1.0","type":"link"}