Sustainability is a major consideration for specifiers choosing building materials and is mirrored in the product development strategies of many manufacturers, including Kemper, the UK's leading producer of liquid-applied waterproofing.

The company has announced that its Kemperol 2K-PUR product - the only solvent-free liquid waterproofing in the UK - now uses resin with an 80% renewable component sourced from castor oil. For specifiers looking for products with a low environmental footprint, this gives the option of zero solvents, a largely renewable composition... and yet no sacrifice in performance or economy. Used with Kemperol fleece - which itself has a 25% recycled content - it has a 20-year warranty and an (ETAG) "expected working life" of at least 25 years.