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Highly vapour permeable and robust roof underlay with exceptional weather tightness in all conditions. Closed cell technology ensures breathability is maintained in extreme wet and cold conditions, where microporous membranes can fail.
1.5m x 15 or 50m
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We design and deliver integrated building performance systems for Passivhaus and low-energy homes across the UK. From design to site commissioning, we help create energy-efficient spaces.
© 2026 21 Degrees. All rights reserved.
21 Degrees is a trading name of GoEco Renewables Limited, our FCA registration number is 1003260. GoEco Renewables Limited is an Appointed Representative of Shermin Finance Limited who are authorised and regulated by the Financial Conduct Authority, FCA registration 727594. Shermin Finance Limited is the broker not the lender and offers credit products from a panel of lenders. The permissions of Shermin Finance Ltd as a principal firm allow GoEco Renewables Limited to undertake credit broking. Credit provided subject to age, status and affordability. Minimum spend applies.
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