Forum Title: Replacing windows in a very old house that doesn't have wood sheathing (ex:OSB)
I have an old old house built in the 1940s. It does not have the 1/2 or 3/4 wood sheathing (plywood or OSB board) that is nowadays more commonly nailed to the framing, and upon which the window's flanges are nailed too. Here is my dilemma. I have a bunch of new windows with flanges waiting to be installed. I don't want to nail the flanges to the 2x4 stud framework. I've been told that would be inappropriate because the flanges are supposed to be nailed to the wood sheathing which my house does not have. Since my house does not have wood sheathing, would it be ok to nail the flanges to the siding of the house which also happen to be 3/4? One consideration - in about 4-6 years time, I may replace the siding for the entire house. I suppose I could also put in a wood sheathing (plywood or OSB) layer at that time right before putting in new siding.
Category: Windows & Doors Post By: TIFFANY WILLIS (Trenton, NJ), 01/10/2019

Around doors and windows, you will want to use minimally expanding foam meant for that purpose. The regular great stuff will expand too much and will bow the framing of doors and windows.

- PAUL TAYLOR (Chico, CA), 02/24/2019

Thanks for the advice. What I ended up doing was almost exactly like you recommended. Since my windows were a little undersized relative to the rough opening. I added some framing to make the rough opening smaller. The siding was a good 3 inches or more from the rough opening, and I filled that 3 inches with 3/4 thick wood sheathing. Once that was done, my 3 wide wood sheathing butted up smoothly to the 3/4 siding. I then concealed the transition between siding and my sheathing strips with window trim. Of course, I also added all the necessary layers of thin window membrane layers in between all that. Thanks for your great suggestions.

- DANIELLE FULLER (South Gate, CA), 02/15/2019

Quote: I don't want to nail the flanges to the 2x4 stud framework. I've been told that would be inappropriate because the flanges are supposed to be nailed to the wood sheathing which my house does not have. Whoever told you that was wrong. Glad it turned out to your liking, and sorry I didn't see this post until now.

- Ron Allen (Newark, NJ), 03/06/2019

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