Residential metal roof systems require
underlayment, and it is critical for three
reasons. One is to keep the structure dry during
the roof system installation process. Another
reason is to provide redundant protection. And
third is to keep condensation on the back of the
roof panels from saturating roof substrates.
Although for many years, 30 lb. asphalt
saturated felt was the standard underlayment
beneath metal roofing, many contractors have
switched to newer synthetics underlayments that
are lightweight and offer more coverage per
roll. Self-adhering underlayments can also be
used. However, it is critical these products
always are smooth rather than mineralized so as
not to damage the back of the metal panels.
During installation of the roof, the
individual roofing panels are fastened together
with special screws that are color coordinated
with the metal roof. The fasteners have a
grounded washer that prevents water infiltration
around the fastener.
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