This technique enables the roof to have a display pitch with out fear of leakage. Rafts were just wood platforms with inflated animal skins beneath them. Next we apply Peel & Adhere Ice & Water Defend to all the penetrations (Chimney, Skylight, Plumbing Stacks, B-Vents, Air Vents, and so on. https://Ypages.in/index.php?page=user&action=pub_profile&id=18456