Flashing As Siding

It is used to protect the horizontal joints between sheets of siding from water infiltration.

Flashing as siding.

The water then runs off the flashing because it can t go up the flashing as it extends up behind the siding. It requires no nails. The water runs down the siding and at the bottom of the first row of vinyl siding it drips off and contacts the metal flashing as it runs across the top of the fascia board. Galvanized z flashing so called because of its z shaped profile keeps water from getting through horizontal joints between sheets of plywood siding.

You set flashing upon top edge of each piece of plywood over a fat bead of caulk and hold it in place with just heads of roofing nails driven into sheathing. Depending on the reveal of your siding the flashing length will be inch less than the reveal. Flashing between brick and siding is a relatively similar process on all types of brick to siding transitions although there may be slight variations based on manufacturer recommendations. The following series of pictures will detail how to make a simple flashing that can be slid up behind the joint.

The large leg of the metal goes against the wall leaving the seat and face covering the top edge of the siding. Even if the roof has been properly flashed against the sidewall this one hasn t water can still run down the side of the house and behind the siding causing rot. The best solution is a preformed or custom bent kick out flashing to divert the water away from the siding. Where the step flashing terminates along a sidewall is a common trouble spot for moisture problems.

The caulk has failed and water can find its way behind the siding. But many builders fail to protect the most vulnerable areas of siding. Galvanized steel z flashing is made from 28 gauge galvanized steel. Siding is the first line of defense against water intrusion and the multitude of problems it causes including the dreaded mold.

Failed caulk joint with no flashing behind. Use a felt paper spline wrapped around the corner and extending 6 inches beyond the corner board to protect the joints where the siding meets the corner boards see figure 1 5 at left. With the flashing in place let s see what happens. The solution to rotting sidewalls is a small piece of bent metal called a kickout flashing at roofing suppliers which simply directs all that water away from the wall.

Continue installing the z flashing at the top edge of the siding panels across the full length of wall. The seat dimension 3 8 in corresponds to the siding thickness.