Screws with gaskets

The second layer of the waterproofing film closes the heat -reinforced layer of the roof from the inside, from the inner moisture of the attic. Between the surface flooring of the roof and the roofing material, a ventilation gap must be created. The sheets of corrugated board are attached to wooden bars along the upper and lower profile. To fasten the corrugated board, special screws with gaskets are used that protect the holes from the course.