{"product_id":"classi-seal","title":"Classi Seal Waterproofing Strip | Sold Per Metre | Self-Adhesive | 15mm Movement","description":"\u003cp\u003eThe \u003cstrong\u003eClassi Seal Waterproofing Strip\u003c\/strong\u003e (SKU: CS025) 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\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\u003eFor example, quantity 3 = 3 metres, quantity 5 = 5 metres. \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. For a standard pre-cut length, see the \u003ca href=\"\/products\/classi-seal-3-2m-length-waterproofing-strip\"\u003eClassi Seal 3.2m Pre-Cut Strip (CS032)\u003c\/a\u003e.\n\u003c\/div\u003e\n\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, no offcuts\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\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\u003eMaximum Roll Length:\u003c\/strong\u003e 25 metres\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\n\u003ch2\u003eAlso Available\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/classi-seal-3-2m-length-waterproofing-strip\"\u003eClassi Seal 3.2m Pre-Cut Strip (CS032)\u003c\/a\u003e — ready-to-use pre-cut length for a standard shower tray or bath on 3 sides\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/flexi-seal-2-0m-length-waterproofing-strip\"\u003eFlexi-Seal 2.0m Waterproofing Strip\u003c\/a\u003e — alternative; shorter pre-cut length for smaller installations\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/flexi-seal-4-0m-length-waterproofing-strip\"\u003eFlexi-Seal 4.0m Waterproofing Strip\u003c\/a\u003e — alternative; longer pre-cut length for larger baths and shower trays\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\u003cli\u003e\u003ca href=\"\/collections\/waterproofing\"\u003eBrowse All Waterproofing \u0026amp; Tanking Products\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I order the right length?\u003c\/strong\u003e\u003cbr\u003eEnter the number of metres you need as the quantity at checkout. 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\n\u003cp\u003e\u003cstrong\u003eWhy use a tanking strip instead of silicone alone?\u003c\/strong\u003e\u003cbr\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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I tile immediately after applying Classi Seal?\u003c\/strong\u003e\u003cbr\u003eYes — no curing time is required. 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\n\u003cp\u003e\u003cstrong\u003eWhat type of silicone should I use?\u003c\/strong\u003e\u003cbr\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. Neutral cure silicone is widely available and is the correct choice for use with tanking strips and most bathroom materials.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs there a pre-cut version available?\u003c\/strong\u003e\u003cbr\u003eYes — the \u003ca href=\"\/products\/classi-seal-3-2m-length-waterproofing-strip\"\u003eClassi Seal 3.2m Pre-Cut Strip (CS032)\u003c\/a\u003e is ideal for a single standard shower tray or bath installation with no measuring required. The per-metre option (this product) is best when you need a specific custom length, are completing multiple bathrooms, or want to avoid waste.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I order if the item shows as out of stock?\u003c\/strong\u003e\u003cbr\u003eYes — we can fulfil this product even when stock shows as zero. Place your order as normal and we’ll confirm lead time with you. For urgent enquiries, call us on \u003ca href=\"tel:01603381095\"\u003e01603 381095\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eDelivery Information\u003c\/h2\u003e\n\u003cp\u003eThis is a small, postable item covered by a one-off small item delivery charge. You can combine it with other small items in a single order and pay just one delivery charge. \u003ca href=\"\/collections\/small-items\" target=\"_blank\"\u003eBrowse all items covered by the small delivery charge\u003c\/a\u003e.\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=1787645625","url":"https:\/\/www.bubblegumbathrooms.com\/products\/classi-seal","provider":"Bubblegum Bathrooms","version":"1.0","type":"link"}