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masraum masraum is online now
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Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 57,056
Insulating a 100 yr old home, no sheathing

We've got an old wood frame pier and beam home that was built by the original owner a hundred years ago. We're working on it and in many places/cases will have access inside the walls. I've discovered that insulation is spotty at best. I think all of it is <30 years old, but there's just not much of it.

We've got the bathroom gutted. From inside the bathroom, I can see to outside at the bottom of the walls. I was thinking that running some caulk down the cracks, but then I thought that it might be easier to run some low expansion "Great Stuff" (foam in a can) in that area. What do you guys think.

I'm also going to pull some of the shiplap, put in f/g bat insulation and then put the shiplap back unless someone has some other genius idea that is better/easier. On interior walls where there's plumbing, should I put insulation around the plumbing as an extra safety precaution? We had no frozen/broken pipes inside the house last year (mostly PVC, a little copper, new/remodel stuff is all pex).

The bathroom looks a little different now. The old plumbing has been removed and new plumbing put in place, but the important part is where you can see light at the bottom of the walls (red square), and the confusing insulation in the yellow square.
On the west wall (left side of the pic) left of the window (not in the pic) there's some insulation at the top of the wall, but it only comes part way down. But in the portion of the pic that you can see, the insulation seems to be in the middle of the wall, but does not extend to the top of the wall. I also don't see any insulation on the north facing wall, but I suppose it's possible that there's some there that I just can't see. Of course, none of the insulation made it to the bottom of the wall. (what I'd love to do is pull all of the siding, insulate, add sheathing and then put new siding on, but that's not in the cards, at least, not currently).



I'm talking about something like this (to seal the gap)


NOT this...
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Last edited by masraum; 11-15-2021 at 07:34 PM..
Old 11-15-2021, 11:08 AM
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