Roof to wall flashing for asphalt shingles
A signifiacnt portion of my light-weight cement tile roof blew away in our last 90mph windstorm, so I am getting a new roof. The contractor (recommended by my insurance comapny) wants to reuse the 15-yead-old 4×5 strip flashing where the roff intersects with verticle walls. Is this normal? I have put a few roofs on myself many years ago and each time we used step flashing. I would think that rain running down the walls might get under the shingles using this strip flashing. Is step flashing out of date? Thanks
Replies
Roof-to-wall flashing for asphalt shingles
To clarify, the new roofing material is Owens Corning Woodmoor asphalt shingles.
Step flashing is still used. The difference today is that we often run a strip of ice and water shield/bituminous membrane that wraps up the wall and on the roof before roofing and siding. If the current step flashing is in good condition, it can be reused without removing. Otherwise, you will be removing siding. From the look, you may have live edge clapboards, which may or may not be easy to get your hands on. There is no need to make extra work. If you haven't had problems before, a properly installed asphalt roof won't allow water to run up and in.
There are a half dozen ways to do every detail in a roof, varying according to climate, materials, and individual situation.
Typically, tile is flashed with a single trough flashing and asphalt shingles are flashed with individual "step" flashings. I've never seen a single sloped wall flashing allowed in any shingle manufacturer's installation instructions. Don't allow it.
But it is what is required in Florida, with seal strip