Skylights often are a desired enhancement for low- and
steep-slope roof systems. As such, skylights often are installed as
part of remodeling or upgrading an existing interior space,
especially for residential construction. Skylights allow sunlight
into a building's interior and can be designed to increase
ventilation or release smoke.
Although there are several skylight types with different
features, skylights share many commonalities regarding design and
installation. And there are issues that should be understood about
what skylight installation does to a roof system, such as flashing
concerns, especially for reroofing projects; insulation concerns;
and potential vapor retarder and condensation concerns.
A typical skylight consists of a translucent or clear lens and
extruded metal frame. Lenses are made from acrylic or polycarbonate
(for impact resistance) and available in single configurations or
double configurations (for added insulation). Skylight lenses and
frames can be manufactured with an integral curb or installed on
top of a site-built curb. Site-built curbs provide greater
flexibility for installation height. However, skylights with
integral curbs are available in various heights, such as 4 inches,
9 inches and 12 inches (100 mm,...
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