Description
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✓ Pre-cut 3.2m length - perfect for standard shower trays and baths
The Classi Seal Waterproofing Strip is a professional-grade, self-adhesive tanking solution designed to create a reliable secondary seal between shower trays or baths and bathroom walls. This flexible waterproofing strip prevents water ingress caused by building movement and settlement, offering superior long-term protection compared to silicone sealant alone.
Key Features & Benefits
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Pre-Cut 3.2m Length – Ideal for standard shower trays and baths (covers three sides)
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Accommodates 15mm Movement – Flexes with building settlement without compromising the seal
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Self-Adhesive Backing – Quick, easy installation with no mess or waiting
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Immediate Tiling – No curing time required, tile straight away
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Superior to Silicone Alone – Creates a watertight barrier that lasts longer
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Professional Finish – Combines with neutral cure silicone for complete protection
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Flexible Strip Design – Conforms perfectly to shower tray and bath edges
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Prevents Leak Damage – Protects against costly water damage and mould growth
Why 3.2m Length?
This pre-cut 3.2m length is specifically designed for standard UK shower trays and baths. It provides enough material to seal three sides (typically two long edges at 900mm each and one short edge at 700-800mm) with minimal waste. This eliminates guesswork, reduces material waste, and ensures you have exactly what you need for typical bathroom installations.
How Classi Seal Works
Classi Seal creates a dual-layer waterproofing system that far exceeds the protection offered by silicone sealant alone:
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Application: The self-adhesive strip is applied to the wall-facing edges of the shower tray or bath before installation
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Installation: The tray/bath is positioned, and the upstand portion of the strip extends up the wall
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Tiling: Tiles are applied over the upstand, creating a waterproof barrier behind the tiles
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Sealing: The bottom edge is sealed with neutral cure silicone for a complete watertight seal
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Protection: The flexible strip accommodates up to 15mm of building movement without cracking or leaking
Technical Specifications
- Manufacturer: Classi
- Product: Waterproofing tanking strip
- Length: 3.2 metres (pre-cut)
- Width: Typically 100-120mm (upstand + base)
- Type: Self-adhesive flexible strip
- 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 surfaces
- Finish: Tile over upstand, seal base with neutral cure silicone
- Coverage: Standard shower tray or bath (3 sides)
- Barcode: 5060062840094
- SKU: CS032
Applications & Use Cases
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Shower Tray Installations: Seal between tray and wall on three sides
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Bath Installations: Waterproof bath-to-wall junctions
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Wet Rooms: Additional waterproofing for former edges
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Bathroom Renovations: Upgrade existing installations with superior protection
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New Builds: Professional waterproofing for new bathroom projects
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Commercial Bathrooms: Hotels, gyms, care facilities, schools
Why Choose Classi Seal Over Silicone Alone?
Traditional silicone sealant is the first line of defence, but it has limitations. Building movement, settlement, and thermal expansion can cause silicone to crack or separate from surfaces over time. Classi Seal provides a critical secondary barrier that:
- Accommodates building movement without failing
- Creates a waterproof membrane behind the tiles
- Prevents water from reaching the substrate even if silicone fails
- Extends the life of your bathroom installation
- Meets and exceeds building regulations for wet areas
- Prevents costly water damage, rot, and mould growth
Installation Instructions
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Prepare Surface: Ensure shower tray or bath edges are clean, dry, and dust-free
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Apply Strip: Remove backing and apply Classi Seal to the wall-facing edges of the tray/bath
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Press Firmly: Ensure good adhesion along the entire length
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Position Tray/Bath: Install the tray or bath with the upstand against the wall
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Tile Over: Apply tiles over the upstand portion of the strip
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Seal Base: Once tiling is complete, apply neutral cure silicone to the bottom edge
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Cure: Allow silicone to cure as per manufacturer's instructions
What You'll Need
- Classi Seal 3.2m strip (this product)
- Neutral cure silicone sealant
- Silicone gun
- Clean cloth and degreaser for surface preparation
- Scissors or knife for trimming (if required)
Professional Tips
- Always use neutral cure silicone (not acetic/vinegar cure) to avoid damaging the strip
- Apply to clean, dry surfaces for maximum adhesion
- Work in temperatures between 5°C and 35°C for best results
- Press firmly along the entire length to ensure complete adhesion
- Trim excess length with scissors or a sharp knife if needed
Building Regulations Compliance
Classi Seal helps ensure compliance with UK Building Regulations Part C (Site Preparation and Resistance to Contaminants and Moisture) by providing effective waterproofing in wet areas. The dual-layer approach (tanking strip + silicone) is considered best practice by professional bathroom installers and exceeds minimum requirements.
About Classi
Classi specializes in professional waterproofing and tanking solutions for the bathroom industry. Their products are trusted by professional installers, bathroom fitters, and builders across the UK for reliable, long-lasting protection against water damage.
Perfect for: Professional bathroom installers, plumbers, tilers, builders, property developers, and competent DIY enthusiasts seeking reliable, professional-grade waterproofing that exceeds building regulations and prevents costly water damage.
🛡️ PROFESSIONAL WATERPROOFING: Pre-Cut 3.2m Strip - Save £23.30 🛡️
