flashing vinyl window in wood wall
I removed vinyl siding on a 1950 house, exposing original tongue-and-groove boards underneath. Now the nailing fins and J-channel of the vinyl window are exposed (see photo).
The plan is to keep the window and simply paint the wood; the issue is how to flash the head trim. Usual flashing techniques won’t work, as the wall consists simply of the T&G boards nailed to studs. Behind the wall is an unfinished attic used only for storage. There’s very little roof overhang, although I will be adding rake boards. (The photo shows two mockups of rake boards: a 1×6 over a 2×6 on the left side, and a 1×6 by itself on the right side.)
I would like to trim the window with 1×4 PVC slipped into the J-channel. If I cut a shallow kerf in the wood wall, I could slip flashing into the kerf, with a drip edge extending over the top of the 1×4. Any other suggestions? Should I also put flashing tape over the nailing fins before slipping the 1×4 in?
Replies
Va
I see the J channel-don't see the nailing fins.
See the built up and covered or just bent alum. casing.
Were the windows installed to sheeting, then this wood siding applied over the nailing fin?
flashing vinyl window in wood wall
Calvin, you're right; I should have been more careful in my description. The nail slots visible in the photo are the J-channel. These are replacement windows, not original to the house. I don't know exactly how they were installed, but the vertical wood siding was definitely not installed after the windows, it was installed about 50 years before the windows.
My question is still the same: what's the best way to flash the head trim?
Andy
va
The best way?
Well, the head flash needs to be up behind the siding.
But,
that still leaves the sides and bottom of that window vulnerable to water penetration.
Had there not been any leaking at least back behind or onto the existing siding prior to removing the vinyl?