Tray Formers & Tanking

The Classi Seal Waterproofing Strip (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. 📏 Sold per metre — enter the quantity in metres at checkout.For example, quantity 3 = 3 metres, quantity 5 = 5 metres. How much do you need? 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 Classi Seal 3.2m Pre-Cut Strip (CS032). Key Features Sold Per Metre — cut to your exact length from a 25m roll; no waste, no offcuts Self-Adhesive Backing — pressure-sensitive; quick, clean installation 15mm Movement Accommodation — flexes with building settlement without compromising the seal Tile Immediately — no curing time required after application Superior to Silicone Alone — creates a waterproof membrane behind the tiles Flexible Strip — conforms to shower tray and bath edges Technical Specification Brand: Classi SKU: CS025 Type: Self-adhesive flexible waterproofing tanking strip Sold: Per metre (cut from 25m roll) Width: 100–120mm (upstand + base) Weight: 0.15kg per metre Movement Accommodation: Up to 15mm Adhesive: Pressure-sensitive self-adhesive backing Material: Flexible waterproof membrane Application Temperature: 5°C to 35°C Suitable Surfaces: Clean, dry, dust-free Maximum Roll Length: 25 metres How It Works Prepare: Ensure tray or bath edges are clean, dry, and dust-free Apply: Remove backing and press Classi Seal firmly to the wall-facing edges of the tray or bath Position: Install the tray or bath — the upstand extends up the wall Tile: Apply tiles over the upstand immediately — no curing wait Seal: Apply neutral cure silicone to the bottom edge once tiling is complete Also Available Classi Seal 3.2m Pre-Cut Strip (CS032) — ready-to-use pre-cut length for a standard shower tray or bath on 3 sides Flexi-Seal 2.0m Waterproofing Strip — alternative; shorter pre-cut length for smaller installations Flexi-Seal 4.0m Waterproofing Strip — alternative; longer pre-cut length for larger baths and shower trays Shower Trays — browse compatible flat and low profile trays Browse All Waterproofing & Tanking Products Frequently Asked Questions How do I order the right length?Enter 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. Why use a tanking strip instead of silicone alone?Silicone 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. Can I tile immediately after applying Classi Seal?Yes — 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. What type of silicone should I use?Always use neutral cure silicone (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. Is there a pre-cut version available?Yes — the Classi Seal 3.2m Pre-Cut Strip (CS032) 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. Can I order if the item shows as out of stock?Yes — 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 01603 381095. Delivery Information This 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. Browse all items covered by the small delivery charge.

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The Waterbarrier 5m² Floor Tanking Kit is a complete wet room floor Peel & Stick waterproofing system, that has no curing time so can be tiled over straight away, providing everything needed to fully tank a wet room floor up to 5m². Exclusively manufactured for us by Impey — one of the UK's leading wet room specialists — this high-performance waterproof membrane provides a robust, long-lasting barrier against water penetration, protecting the subfloor and structure beneath. Trusted by professional bathroom installers and backed by a 10-year guarantee. ⚠️ Professional installation recommended. Wet room tanking is a critical waterproofing stage. Incorrect application can result in water damage to the subfloor and structure. Follow the installation guidelines and ensure all joints, corners, and penetrations are correctly sealed. Key Features Covers up to 5m² — suitable for standard wet room floor areas Complete kit — membrane, 4 internal corners, and joint tape all included 4 internal corners included — pre-formed corners for a reliable seal at floor-to-wall junctions Joint tape included — sufficient tape for all membrane joints within the kit coverage area High-performance membrane — robust, long-lasting protection against water penetration 10-year guarantee Technical Specification Specification Detail Range Waterbarrier Type Floor tanking kit — waterproof membrane and accessories Coverage Up to 5m² Application Wet room floors Country of Origin United Kingdom Guarantee 10 years What's Included Waterbarrier waterproof membrane (5m² coverage) 4 × pre-formed internal corners Joint tape (sufficient for membrane joints within the kit area) Installation instructions Guarantee documentation Frequently Asked Questions What is floor tanking?Floor tanking is the process of applying a waterproof membrane system to a wet room floor before tiling. It creates a continuous waterproof layer beneath the tiles that prevents water from penetrating the subfloor and structure. It is an essential stage in any wet room installation and must be done correctly to prevent costly water damage. What area does this kit cover?This kit covers up to 5m² of floor area. For a typical wet room, measure the floor area (length × width in metres) to confirm this kit is sufficient. Call us on 01603 381095 if you need advice on coverage for your specific installation. Why are internal corners included?Internal corners — where the floor meets the wall — are the most vulnerable points in a wet room waterproofing system. The 4 pre-formed internal corners included in this kit create a reliable, consistent seal at these critical junctions. Is professional installation required?Professional installation is strongly recommended. Wet room tanking is a critical waterproofing stage — incorrect application, particularly at joints, corners, and pipe penetrations, can result in water damage to the subfloor and building structure. Can I order if the item shows as out of stock?Yes — we operate on a pre-order basis for out-of-stock items. Please contact us at customerservice@bubblegumbathrooms.co.uk or call 01603 381095 to confirm lead times before ordering.

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