The house I’m remodeling has lap siding with no sheathing… it’s an old house.
We’ve stripped all the drywall out, and where their was no insulation in the exterior walls before, we want to put some now.
My question is, since no siding is waterproof, what concerns should i have about putting fiberglass, or perhaps some other kind of insulaton in a wall that has no sheathing, but wood lap siding nailed direct to the studs.
house is in raleigh, nc
thanks
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Replies
First off, fill in your profile. Location would really help.
Closed cell spray foam insulation might be a solution. That is virtually waterproof. I down side is that it would stick to the lap siding and that would require keeping that as long as the insulation is there.
You could install rigid foam board, meant for basement wall applications.
My own house is the same deal. It's a story and a half bungalow and the lower portion of the house has no sheathing no felt, no nuthin, but 3/4 fir lap siding cut in a 'double v' nailed right to the old-growth fir studs.
The siding also runs UNDER all the trims too and the resulting spaces in from the v's are caulked.
I don't like it.
On this thread, however, would it be stupid, then as drbgwood is inquiring, to blow in insulation as I was thinking to do this summer?
There is sheathing on the 1/2 story though.
Thank you,
Pat
thanks to all,
I'm getting that it would be a bad idea to just go with fiberglass strait into the walls as the owner requested. at a minimum, with the current siding, i'm leaning toward sticking foam sheathing in between the stud bays, then glass on top of that. I'll have to check the thicknesses of everything though.
Or, another idea, put the foam panels in first, then spray foam over the top to them. that would keep the foam from sticking to the siding. how does the price of spray foam compair to fiberglass?
one vairiable here is that we might be going to go with vinyl siding over the lap boards anyway. If we do that, fiberglass craft face by its self should be just fine. right?
talked with the homeowner today, he's getting an "insulation guy" to take care of the walls. The plan offered is to just turn the insulation around, put the kraft paper against the siding... This aint a good idea, is it? I thought the paper went toward the inside.
It's a rental house, and the ho is going for cheap everything. My sugestion was to at least put strips of tar paper up in the stud bays, then insulate as normal.