The horizontal top surfaces of walls are the most vulnerable point for water to enter the wall.
Roof flashing and coping.
There are a number of ways of protecting this surface with waterproof membranes and flashing.
Such a system usually consists of copper counterflashing and base flashing in conjunction with roof composition flashing or coping.
The roof side of the copper is cleated to the nailable cant strip.
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The counterflashing diverts water to the base flashing which in turn diverts it to the composition flashing.
Copper flashing is used wherever a wall intersects a roof.
The roof composition flashing extends up the cant strip over the coping and part way down its face under the copper flashing.
Standard coping materials include concrete metal stone and terra cotta see types of wall coping.
On the opposite side a continuous copper edge strip is attached to the coping and the lower edge is bent to form a drip.
All properly made copings should be waterproof and fireproof should be slightly wider than the wall itself should have drip edges on both sides to.
Coping not only helps to protect a roof wall structure from water damage and helps to direct water away from the building facade it also provides a sleek look.
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