FOERFARANDE FOER FRAMSTAELLNING AV TAKFILT BESTAOENDE AV FIBERMATTA VECKAD METALLFOLIE OCH BITUMEN

摘要

The flame resistance of a bituminized roof sheet consisting of a reinforced fleece, a metal foil and bitumen is improved substantially by applying a metal foil to one face. A rupture of the metal foil in the case of stress due to elongation is prevented by wrinkling it. The elongation reserve thus obtained is in the range of from 2 to 35%.