How To Flash An Existing Window
Fine Homebuilding Project Guides
Windows & Doors
Flashing for Old Windows
How do you get a good weathertight seal on sometime windows that don't have a flange?
I'yard stripping the siding off of my firm, and have added housewrap to replace the erstwhile breakable building paper. I won't be replacing the windows or casing (which seems to be part of the window itself), but I would like to weatherize them while I have the chance. Everything I see these days is about flashing flanged windows. How do you get a skillful weathertight seal on old windows that don't have a flange?
—Tim, via email
Editorial advisor Mike Guertin: It's non uncommon for erstwhile windows to have the exterior casing keyed into the jamb with a lap joint and gum. In this case, they probably can't exist removed without damaging the jamb and/or the casing. In the past, I've had good luck with a workaround, though.
Start by using a thin flat bar or potent putty pocketknife and pry the side casings away from the wall well-nigh 1/viii in.—just plenty to fit the blade of an oscillating multitool or reciprocating saw to cut any nails within 1-1/2 in. of the casing edge without damaging the casing-to-jamb joint. With the nails out of the style, slide in a iv-in.-wide strip of self-adhering flashing tape with the sticky side facing out. To brand the strips manageable, put them in a cooler or freezer for 30 minutes before installing so the agglutinative is less aggressive.
The strips should extend a couple inches above the top of the caput casing and a couple inches beneath the bottom of the sill. Y'all may have to back-cutting the sill a niggling to permit the tape to slide backside information technology. The portion of the side strips below the sill will need to overlap the new housewrap later, so don't fasten them to the wall. Slide a putty knife backside the flashing record and employ information technology to printing the agglutinative side of the record onto the back side of the casing.
Next, apply strips of 4-in. flashing tape over the exposed face of the installed strips—sticky side to sticky side—and also to the sheathing. Go out the release sheet on the bottom corners of these strips of tape that extend below the sill and so that the housewrap can be slid beneath later on. At present employ a strip of self-adhering membrane—six in. to 9 in. broad—along the top of the head trim, with most 1⁄4 in. of the tape wrapping over onto the face of the trim. This piece should extend past the 4-in. flashing tape on both sides.
Stop up by installing a sloped metallic or plastic cap flashing over the head casing with a 1/2-in. or greater drip leg on the front and finish dams on each terminate.
Unfortunately, this flashing method won't do a cracking job of air-sealing. In gild to go at that place, or at to the lowest degree go closer, yous will likely need to remove the exterior casing.
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Source: https://www.finehomebuilding.com/project-guides/windows-doors/flashing-old-windows
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