Old roofing made of tar paper very often, in addition to the renovation itself, also require adequate ventilation. It is extremely important, if only to avoid the accumulation of water in the structure of a given layer.
Ventilation problems usually begin when a new one is applied to the old layer of tar paper. One of the ways to deal with this problem is to lay a perforated roofing felt on the old substrate, which is loosely laid on the substrate and primed with a dispersive asphalt-rubber mass. This issue is also connected to chimney flashing and gutter repairs.
