Butynol is a cost effective and durable waterproofing membrane. When applied correctly and maintained, this product will easily outlast its 15-20 year manufacturers warranty Butynol come in variety of colours. Normally black for roofs and gray for decks. Butynol is made up of 3 different thicknesses 1mm, 1.2mm and 1.5mm.Only the black comes in 1mm thickness that is used in internal gutters. The second most popular colour is dove gray this comes in 1.2mm for roofs and 1.5mm for walk out decks.