In
recent years many problems have developed with the use of asphalt
shingles in compact roof design. When shingles are installed over
nailable organic substrates such as plywood or OSB, changes in the
moisture content of these substrates can cause them to shrink or swell.
This can lead to buckling or splitting of the shingles. When shingles
are installed over insulated decks there can be a build up of heat
in the shingles that can dramatically reduce the shingles life. These
problems have led the Asphalt Roofing Manufacturer Association (ARMA)
to issue statements discouraging the installation of their products
over insulated deck without providing adequate ventilation to carry
off the heat and humidity. Depending on the installation, the recommended
minimum amount of venting space is between 1/150 and 1/300th of the
total roof area.
The Solution - Duraflex Mineral Board
Loadmaster
uses only inorganic and dimensionally stable Duraflex gypsum based
mineral boards as the substrate upon which shingles are nailed. This
dimensional stability eliminates any shrinking or swelling of the
boards. Loadmaster's installation techniques eliminate gaps between
the boards while the engineered fastener patterns eliminate substrate
movement. These factors eliminate any shingle buckling due to substrate
movement. Its heat sink properties absorb the heat from the sun and
provide protection from any damaging heat buildup.
