20m² Waterproofing DIY Kit
20m² Waterproofing DIY Kit
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DIY Waterproofing Kit
Seal & Protect Medium-Sized Projects
The 20m² Waterproofing Box is a complete DIY waterproofing kit designed for medium-sized waterproofing projects. With double the coating of our 10m² box, it's built to tackle larger jobs in one go — professional results without the professional price tag.
What's Included
Ideal For
Why Choose the 20m² Box?
Built around our high-performance S400 waterproof coating, this kit gives you two 4L buckets of coating, Muckoff cleaner for the prep, reinforcing tape, and a full set of application tools — enough to cover up to 20 square metres in a single project. Ideal for larger caravan roofs, medium roof repairs, gutter and flashing systems, and ongoing waterproof maintenance, it takes the guesswork out of the job with results that last.
We also offer a 10m² box for small projects and a 30m² box for larger ones, plus the S400 coating on its own in larger sizes — and we can colour match almost any standard roof colour. Get in touch and we'll help you find the right fit.
DIY-applied products are covered by your statutory rights under the Consumer Guarantees Act 1993. Because we can't control site conditions or how the product is applied, DIY application does not carry a performance warranty — see our warranty information for full details.