{"product_id":"classi-seal","title":"Classi Seal Waterproofing Strip — Sold Per Metre — Self-Adhesive — 15mm Movement","description":"\u003ch2\u003eClassi Seal Waterproofing Strip — Sold Per Metre — Self-Adhesive — 15mm Movement\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eClassi Seal Waterproofing Strip\u003c\/strong\u003e is a professional self-adhesive tanking strip designed to create a reliable secondary waterproof seal between shower trays or baths and bathroom walls. Applied before installation, it creates a flexible membrane behind the tiles that accommodates up to 15mm of building movement — providing far superior long-term protection compared to silicone sealant alone. Sold per metre, cut fresh from a 25m roll, so you order exactly what you need with no waste.\u003c\/p\u003e\n\u003cdiv style=\"background: #f8f8f8; border: 1px solid #ddd; border-radius: 4px; padding: 12px 16px; margin-bottom: 20px;\"\u003e\n\u003cstrong\u003e📏 Sold per metre — enter the quantity in metres at checkout.\u003c\/strong\u003e\u003cbr\u003eQuantity 3 = 3 metres (£36) · Quantity 5 = 5 metres (£60) · Quantity 10 = 10 metres (£120)\u003cbr\u003e\u003cstrong\u003eHow much do you need?\u003c\/strong\u003e Standard shower tray or bath (3 sides): approx. 3–3.5m · Large enclosure: 4–5m · Add 10% for trimming.\u003c\/div\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold per metre\u003c\/strong\u003e — cut to your exact length from a 25m roll; no waste\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-adhesive backing\u003c\/strong\u003e — pressure-sensitive; quick, clean installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm movement accommodation\u003c\/strong\u003e — flexes with building settlement without compromising the seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTile immediately\u003c\/strong\u003e — no curing time required after application\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior to silicone alone\u003c\/strong\u003e — creates a waterproof membrane behind the tiles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible strip\u003c\/strong\u003e — conforms to shower tray and bath edges\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specification\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Classi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e CS025\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Self-adhesive flexible waterproofing tanking strip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold:\u003c\/strong\u003e Per metre (cut from 25m roll)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 100–120mm (upstand + base)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15kg per metre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement accommodation:\u003c\/strong\u003e Up to 15mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdhesive:\u003c\/strong\u003e Pressure-sensitive self-adhesive backing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Flexible waterproof membrane\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication temperature:\u003c\/strong\u003e 5°C to 35°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable surfaces:\u003c\/strong\u003e Clean, dry, dust-free\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Tile over upstand; seal base with neutral cure silicone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum roll length:\u003c\/strong\u003e 25 metres\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrepare:\u003c\/strong\u003e Ensure tray or bath edges are clean, dry, and dust-free\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply:\u003c\/strong\u003e Remove backing and press Classi Seal firmly to the wall-facing edges of the tray or bath\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Install the tray or bath — the upstand extends up the wall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTile:\u003c\/strong\u003e Apply tiles over the upstand immediately — no curing wait\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal:\u003c\/strong\u003e Apply neutral cure silicone to the bottom edge once tiling is complete\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eShower tray to wall junctions — typically 3–3.5m for a standard 3-sided installation\u003c\/li\u003e\n\u003cli\u003eBath to wall junctions — typically 3–3.5m for a standard 3-sided installation\u003c\/li\u003e\n\u003cli\u003eWet room former edges — measure perimeter and add 10% for trimming.\u003c\/li\u003e\n\u003cli\u003eLarge shower enclosures — typically 4–5m\u003c\/li\u003e\n\u003cli\u003eCommercial bathrooms — hotels, gyms, care facilities\u003c\/li\u003e\n\u003cli\u003eMultiple projects — order longer lengths to cover several bathrooms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAlso Available\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/waterproofing\"\u003eBrowse all waterproofing \u0026amp; tanking products\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/shower-trays\"\u003eShower Trays\u003c\/a\u003e — browse compatible flat and low profile trays\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I order the right length?\u003c\/h3\u003e\n\u003cp\u003eEnter the number of metres you need as the quantity at checkout. For example, quantity 3 = 3 metres (£36), quantity 5 = 5 metres (£60). We cut your exact length fresh from a 25m roll. As a guide: a standard shower tray or bath on 3 sides requires approximately 3–3.5 metres. Add 10% for trimming. If in doubt, order slightly more — offcuts can be used for future repairs or smaller projects.\u003c\/p\u003e\n\u003ch3\u003eWhy use a tanking strip instead of silicone alone?\u003c\/h3\u003e\n\u003cp\u003eSilicone sealant is the first line of defence but has limitations — building movement, settlement, and thermal expansion can cause silicone to crack or separate over time. Classi Seal provides a critical secondary barrier: a flexible waterproof membrane behind the tiles that accommodates up to 15mm of movement without failing. Even if the silicone joint cracks, the tanking strip prevents water from reaching the substrate. This dual-layer approach is considered best practice by professional bathroom installers and helps meet UK Building Regulations Part C requirements for wet areas.\u003c\/p\u003e\n\u003ch3\u003eCan I tile immediately after applying Classi Seal?\u003c\/h3\u003e\n\u003cp\u003eYes — one of the key advantages of Classi Seal is that \u003cstrong\u003eno curing time is required\u003c\/strong\u003e. Once the strip is applied and the tray or bath is positioned, you can tile over the upstand immediately. The base edge should be sealed with neutral cure silicone once tiling is complete.\u003c\/p\u003e\n\u003ch3\u003eWhat type of silicone should I use with Classi Seal?\u003c\/h3\u003e\n\u003cp\u003eAlways use \u003cstrong\u003eneutral cure silicone\u003c\/strong\u003e (not acetic\/vinegar cure). Acetic cure silicone releases acetic acid during curing, which can damage the adhesive and membrane of the strip. Neutral cure silicone is widely available and is the correct choice for use with tanking strips and most bathroom materials.\u003c\/p\u003e\n\u003ch3\u003eWhat surfaces is Classi Seal suitable for?\u003c\/h3\u003e\n\u003cp\u003eClassi Seal is suitable for clean, dry, dust-free surfaces. Ensure the edges of the shower tray or bath are free from grease, dust, and moisture before application. Apply in temperatures between 5°C and 35°C for best adhesion.\u003c\/p\u003e\n\u003ch3\u003eIs there a pre-cut version available?\u003c\/h3\u003e\n\u003cp\u003eYes — if you need a standard length for a single installation, a pre-cut 3.2m version is also available. The per-metre option (this product) is ideal when you need a specific custom length, are completing multiple bathrooms, or want to avoid waste from a pre-cut length that may not suit your installation.\u003c\/p\u003e\n\u003ch3\u003eCan I order if the item shows as out of stock?\u003c\/h3\u003e\n\u003cp\u003eYes — this product is available to order even when stock shows as zero. Please allow additional lead time and contact us on \u003ca href=\"tel:01603381095\"\u003e01603 381095\u003c\/a\u003e to confirm availability.\u003c\/p\u003e","brand":"Classi","offers":[{"title":"Default Title","offer_id":52747054252369,"sku":"CS025","price":12.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/3687\/9441\/files\/classi-seal-step4.jpg?v=1770390021","url":"https:\/\/bubblegumbathrooms.com\/products\/classi-seal","provider":"Bubblegum Bathrooms","version":"1.0","type":"link"}