A sound roof with an appropriate drainage system unquestionably constitutes the first line of defense against water penetration into your home. But to be effective, a good roof must include items other than just good roofing materials. One of them is flashing. The importance of flashing is often minimized, but it has an indispensable role in keeping your home watertight. Flashing is a construction detail used to seal, and it 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.
✔ Intersecting Roofs & Walls
✔ Vent Stacks
Flashing is used at these intersections to keep rainwater from leaking into the building. It makes joints at these junctions watertight, while at the same time allowing the natural expansion and contraction of materials to continue. It operates on the principle that, in order to penetrate a joint, water must work itself upward against the force of gravity, or in the case of wind-driven rain, would have to follow a tortuous path during which the force of the wind would be dissipated.
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