Composite bituminous sheet, particularly for sealing members

摘要

This invention relates to a composite bituminous sheet, particularly useful for sealing members. Said sheet consists of a main or external zone (1) formed of a cloth which is substantially non-extensible under low stress surrounding at least one central zone (2) to which it is bound, which is formed of an extensible elastic cloth having a tensile elongation at break of at least 100%, the central and external zones being coated with the same bituminous composition having a high elongation at break and a softening point at least equal to 100 DEG C. when determined according to the standard Ring and Ball test.