Appraisal number: 939 (2017)
Date issued: 20 Dec 2017
Watertight Wall Underlay
Watertight Wall Underlay is a synthetic wall underlay for use as a flexible wall underlay under wall claddings on timber and steel-framed buildings. The product consists of a micro-porous water-resistant polypropylene film laminated between two layers of spun-bonded polypropylene and is coloured grey.
Techno Insulation. Brochure Version No.1. Roof Underlay, November 2017
Always refer to the Appraisal in full and the technical literature.