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Sidewall flashing question

3K views 9 replies 4 participants last post by  DannyColpo 
#1 · (Edited)
Roof to Sidewall flashing question

I tore 3 layers of shingles off my side porch today to get it ready for new shingles, and I'm not sure how to install the flashing - I would love a recommendation.

The siding of this 1942 house was installed before the 8' side porch was attached, but the porch is original to the house (it was not an add-on) - the siding below the shingle line is bare wood, never been painted. There is a 1/4"-1/2" gap between the 1x4 porch roof deck and the siding. The sidewall edge of the first layer of shingles was cut longer and bent back so that the shingles curved up against the siding, and the shingle-to-siding joint was caulked with roof tar. The 2 subsequent layers were laid in the same fashion, but without the roof tar. I'm going to assume the sidewall on the other side of the house is "flashed" the same way.

There have not been any leaking issues (the overhang is 24" and is no more than 4' above the porch), but I want to flash the sidewalls correctly when I put the new shingles on. I know step flashing is the best way to flash a sidewall, and I know the step flashing needs to be installed behind the siding. I'm thinking I can cut a 5" section of the siding (I can use a toe-kick saw to cut flush to the top of the roof deck) above and parallel with the roof deck, install step flashing with the shingles, and cover the cut lines with 1x6 trim that would match the rest of the house trim. Is there a better way to flash the porch roof?
 
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#9 ·
More information:



I just remembered that there is no sheathing behind the siding - the siding is nailed directly to the wall studs. If I cut the siding sections, there would be nothing to hold the step flashing in place to the sidewall.


Bent at 90*, the step flashing doesn’t need to be nailed to the vertical edge.

One high nail on the roof deck will hold it.


Sent from my iPhone using Tapatalk
 
#4 ·
It looks like, in your article, that I could apply I&W on the sidewall-to-roof-deck joint (at least 6-8" on the sidewall), then step flash while installing the shingles, and finish with counter-flashing over the step flashing. Am I reading that right?

Driving through our neighborhood, I saw a house that has a newer roof (<5 years) which was replaced after a tornado went through the neighborhood that has the step flashing applied to the face of the sidewall. If that was not code for this area, I'm sure it would not have passed inspection.
 
#6 ·
There is no WRB or sheathing behind the 1x8 pine-lapped siding; the siding is attached directly to the studs.

The sidewall was sided bottom to top before the porch roof was attached. The porch roof deck is not attached to the sidewall; there is a 1/4"-1/2" gap between the roof deck and the sidewall.

There is no way to attach WRB or sheathing to the studs behind the pine siding without removing the porch roof.
 
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