Flashing Under Cedar Siding

Install roofing felt before starting step flashing.

Flashing under cedar siding.

It is always recommended to install step flashing behind stucco dryvit wood panel lap siding vinyl siding cedar shingle siding etc. If your house has a roof line that extends past a corner of two walls make the first piece of step flashing a corner. Proper flashing is critical for any exterior wall assembly. Flashing should be installed per international building code section 1405 3 flashing or consult your local building inspector for more stringent local codes.

Improper flashing and excessive caulking can force and trap water in the wall. The objective of flashing around doors windows and other junctures is to keep water flowing down and out to the surface of the wall. If the shingle already has flashing on it the kickout flashing has to slip beneath it and you ll have to loosen or remove siding to do this. 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.

Step flashings on a cedar shake roof are typically installed every 10 inches. If the sidewall is stucco or solid wood like ours and you can t open it to get flashing behind it continue the step flashing to the peak of the roof then cover the step flashing with cap flashing photo 2. Failing to replace step flashings when a cedar shake roof is replaced with a composition shingle roof. Use overlapping 1x4s or 1x6s at outside corners or use 5 4 stock for a heavier look.