VELAPHONE is an acoustic membrane made of polyester felt and a vapour barrier film (black film). It is specially designed to be mainly used on wood structures under a layer of 1½ in (38 mm)-thick self-levelling concrete.
- Provides structural waterproofing while concrete is poured.
- Prevents a too-rapid evaporation of water from the concrete to improve curing.
- Resists crushing; preserves its acoustic properties.