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phriver1
installing new moisture barrier to outside stone wall
phriver1

We had the water line for the water softener come loose in the middle of the night and flood the garage. When we woke up and discovered it, we immediately tore all the wet sheet rock, etc out, dried everything with fans and treated for mold. Now for the repair, we are totally stumped. It's an older house - about 38 yrs old. There is the outside wall which is limestone, then there was this thin, cardboard like moisture barrier, then the framing 2x4's. After pulling out the wet moisture barrier which was like paper when wet, there was just the stone wall. Because the 2x4's are anchored to the stone wall you can't easily just slip new moisture barrier behind them for a quick fix. We've gotten a variety of opinions from six different carpenters,contractors and a mason guy, which include taking down the outside stone wall to install new moisture barrier, installing new barrier between studs, and removing stud frame inside to attach moisture barrier to and then anchor back in place. There are minor cracks in stone wall (from stones not being placed correctly we're told), however one carpenter who also has a number of yrs of masonry experience told us the wall was very stable. He's the one that recommended pulling studs down, putting moisture barrier on studs/frame and re-anchoring to stone wall. We can't get a hold of him though to get work done. Makes me think he's maybe nervous or unsure about job? What would you say is the most economical, and adequate fix? Please Help!

Sombreuil_mongrel
Re: installing new moisture barrier to outside stone wall
Sombreuil_mongrel

It was not "moisture barrier" it was fibreboard wall sheathing; i.e.: what kept the wooden structure from racking/folding like a house of cards.
The best thing to do is to replace it with plywood sheathing nailed into the studs (on the interior side) with a typical sheathing nailing schedule. You can paint the plywood. I would not recommend sandwiching drywall on top of the sheathing.
Casey

phriver1
Re: installing new moisture barrier to outside stone wall
phriver1

we were told that this moisture barrier or sheathing was there bc the limestone sweats (we're in central Tx) and the barrier was there to protect the 2x4 frame from the moisture, which is why we're hesitant to just put something up on the inside of the wall, leaving the 2x4 frame exposed to sweating from limestone wall. We don't want to run into mold or other issues later....

Mastercarpentry
Re: installing new moisture barrier to outside stone wall
Mastercarpentry

I'm wondering if a closed-cell foam insulation sprayed into that space from the inside wouldn't form an adequate moisture barrier? The CC kind is waterproof and expands into place to fill the gaps plus then you wouldn't need to move or remove any framing. On the inside you could add diagonal strap bracing to handle racking loads and cover with sheetrock etal as the foam isn't rated for exposure (fire codes). You may not need the insulation properties of the foam but the end cost might make it your best alternative here. It would sure beat rebuilding that stone wall.

Phil

Sombreuil_mongrel
Re: installing new moisture barrier to outside stone wall
Sombreuil_mongrel

Closed-cell would be ideal, but I bet they will not like the price!
Casey

Mastercarpentry
Re: installing new moisture barrier to outside stone wall
Mastercarpentry
Sombreuil_mongrel wrote:

Closed-cell would be ideal, but I bet they will not like the price!
Casey

Well, compared to doing a stone demo or reworking the wall and sheathing from inside it may actually be cheaper. It would certainly be faster and easier which also has value.

Phil

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