Ondutiss Vapour Permeable Underlay 120g 1 x 50m roll

Ondutiss Air120 is a 120gsm high vapour permeable membrane, suitable for cold and warm roof applications. High vapour permeability ensuring the membrane absorbs the vapour so insulation layer dry. No ventilation gap needed. Totally waterproof, offering a secondary layer of protection against driving rain or snow. Overlap indicators on the membrane for fast and easy installation.