Kerabit 700 UB is a bituminous underlay, that can be used laid on solid wood underlays or as a hanging, step-resistant underlay.
Both sides of the underlay are covered with a polypropylene fabric. This underlay has an adhesive edge. The surface has no sand.
Kerabit 700 UB can be used as an underlay for tin and tile roofings as well as bitumen shingles.
This product is diffusion-proof, therefore requiring ventilation in the space below the underlay.