What is flashing?
Flashing is a construction detail used to seal and protects
joints in a building from water penetration. The joints created by the
intersection of the roof and roof mounted structures and projections, such as
parapets, hatches, skylights, chimneys, vent stacks, or towers, are among the
most vulnerable areas of roofing systems. They constantly expand and contract
in response to changes in humidity and temperature. Greater the number of such projections,
greater the potential for leaks.
Roof flashing represents a very simple and intuitive
engineering technique that has been known for hundreds of years. The whole idea
depends almost entirely on gravity. If the flashing has been installed
correctly, gravity will work with the flashing material to shed the water onto
the regular roofing materials, where it is then directed harmlessly to the
ground. Roof flashing is commonly used around chimneys, fan vents, plumbing
vent stacks, and other items that project out of residential roofs.
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