{"product_id":"classicbond-epdm-internal-corner-patch","title":"ClassicBond EPDM Internal Corner Patch","description":"\u003ch3\u003eUncured EPDM Patch for Internal Corners on Wall Edges and L-Shaped Roof Details\u003c\/h3\u003e\n\n\u003cp\u003eThe ClassicBond Internal Corner Patch is an uncured, formable EPDM flashing patch used to waterproof internal corners, returns, and complex junctions on EPDM rubber roofing systems.\u003c\/p\u003e\n\n\u003cp\u003eIt is designed to stretch and mould cleanly into internal angles where cured EPDM membrane cannot be folded or dressed without cutting, making it the correct detailing solution for internal corners on walls, L-shaped roofs and in box gutters.\u003c\/p\u003e\n\n\u003c!-- COLLAPSIBLES --\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; list-style:none;\"\u003e\n    What This Internal Corner Patch Actually Is\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\u003eThis internal corner patch is made from uncured EPDM, the same material used in ClassicBond 9″ PS Elastoform uncured flashing tape.\u003c\/p\u003e\n    \u003cp\u003eIn practical terms:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eIt is a pre-cut, 6\" section of 9\" uncured EPDM flashing tape\u003c\/li\u003e\n      \u003cli\u003eLaminated to a pressure-sensitive adhesive backing\u003c\/li\u003e\n      \u003cli\u003eSupplied in a size suited to standard internal corners\u003c\/li\u003e\n      \u003cli\u003eDesigned for quick, reliable corner detailing without buying a full metre of tape\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eLike all uncured EPDM flashing, it is self-curing once installed, allowing it to adapt to the detail and form a long-lasting waterproof seal.\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; list-style:none;\"\u003e\n    When to Use an Internal Corner Patch\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\u003eThis uncured EPDM internal corner patch is ideal for:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eInternal corners where two walls meet\u003c\/li\u003e\n      \u003cli\u003eReturns on upstands\u003c\/li\u003e\n      \u003cli\u003eL-shaped EPDM roof layouts\u003c\/li\u003e\n      \u003cli\u003eInternal corners at:\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003col\u003e\n      \u003cli\u003eWalls\u003c\/li\u003e\n      \u003cli\u003eParapet walls \u0026lt;150mm high\u003c\/li\u003e\n      \u003cli\u003eRoof returns\u003c\/li\u003e\n      \u003cli\u003eBoxed details\u003c\/li\u003e\n      \u003cli\u003eInternal changes in roof direction\u003c\/li\u003e\n    \u003c\/ol\u003e\n    \u003cp\u003eIt is suitable for \u003cstrong\u003eupstands up to approximately 150mm high\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003cp\u003eUsing uncured EPDM here avoids cutting, folding, or overlapping the main membrane, which can otherwise create potential leak paths.\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; list-style:none;\"\u003e\n    When to Use a Longer Length of 9″ Uncured EPDM Tape Instead\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\u003eIf you are dealing with:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\u003cstrong\u003eHigher upstands\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003e\u003cstrong\u003eMultiple internal corners\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003e\u003cstrong\u003eLonger internal details\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003e\u003cstrong\u003eMore complex shapes\u003c\/strong\u003e\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eIt is usually more practical to use \u003cstrong\u003eClassicBond 9″ uncured EPDM flashing tape\u003c\/strong\u003e, which can be cut to any length required.\u003c\/p\u003e\n    \u003cp\u003e👉 The internal corner patch is best seen as a ready-cut convenience option, while uncured tape offers more flexibility for larger or repeated details.\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; list-style:none;\"\u003e\n    How the Internal Corner Patch Is Installed (Best Practice)\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\u003eEnsure the membrane surface is clean and dry\u003c\/li\u003e\n      \u003cli\u003eIf weathered, clean with \u003ca href=\"\/products\/classicbond-epdm-weathered-membrane-cleaner\"\u003e\u003cstrong\u003eWeathered Membrane Cleaner\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n      \u003cli\u003eApply \u003ca href=\"\/products\/classicbond-epdm-rubber-roofing-primer\"\u003e\u003cstrong\u003eClassicBond EPDM Primer\u003c\/strong\u003e\u003c\/a\u003e to the membrane and upstand\u003c\/li\u003e\n      \u003cli\u003eAllow primer to become touch dry\u003c\/li\u003e\n      \u003cli\u003eRound off the corners of the patch using scissors\u003c\/li\u003e\n      \u003cli\u003ePosition the patch and press it firmly into the internal corner, stretching it gently to follow the profile\u003c\/li\u003e\n      \u003cli\u003eRoll immediately with a seam roller and penny roller working from the centre outwards\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003e⚠️ \u003cstrong\u003eClassicBond Rubber Primer is required\u003c\/strong\u003e and is \u003cstrong\u003enot included\u003c\/strong\u003e with this patch.\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; list-style:none;\"\u003e\n    A 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\u003eInternal corners are where EPDM detailing can quickly go wrong if the wrong material is used.\u003c\/p\u003e\n    \u003cp\u003eUsing uncured EPDM, whether as a pre-cut internal patch or from a roll of 9″ tape, allows the material to mold around the weak point in the rubber, forming a long-lasting watertight seal.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e","brand":"The Flat Roofing Shop","offers":[{"title":"Default Title","offer_id":56483792814411,"sku":"CB-Corner-Patch-Int","price":3.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/4054\/9451\/files\/Internal-corner-patch-for-epdm-rubber-roofing.jpg?v=1773495044","url":"https:\/\/theflatroofingshop.co.uk\/products\/classicbond-epdm-internal-corner-patch","provider":"The Flat Roofing Shop","version":"1.0","type":"link"}