Kerabit Protect underlay can be used on roof pitches of 1:3 and steeper. Tightness can be ensured by glueing the seams with a mesh-reinforced Kerabit Butyl Strip, laid between the lengths of the underlay, or by glueing Isola Wind Barrier Tape over the seams. The overlaps must be at least 15 cm.
Kerabit Protect is installed longitudinally, starting from the eaves. Before the installation of the first length of the underlay, a supportive board and an eave flashing must be installed on the lower section of the roof plane.