Envirotile Roof Underlay MembraneThe Envirotile Envirolay Roofing Underlay is an essential component for new builds or reroofs, providing high performance fireproof protection while ensuring compliance with BS 476 3. This Type HR underlay is suitable for a wide range of roof structures, including cold roofs, warm roofs, and solid roofs, and requires ventilation at both high and low levels. Made from flame retardant woven glass fibre with aluminium foil, it offers excellent nail tear