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LVP in raised house, subfloor rot?
Posted on 10/15/23 at 2:34 pm
Posted on 10/15/23 at 2:34 pm
I'm in the middle of a major renovation and about to change out flooring. House was built in the 80s and is 8 feet off the ground. Had tarpaper under solid maple hardwood floor. Under the plywood the previous owner sprayed a 3"-4" layer of open cell spray foam insulation. Never had any subfloor rot issues.
I plan on putting down LVP since I have dogs and they scratched up the maple floor that was previously in the house. Now the LVP manufacturers are saying no more to raised home installations as they are seeing subfloor rot. I can see how the LVP on top of ply with closed cell insulation under the subfloor could create a moisture trap. I plan on using a mat such as DMX 1 Step 2.0 under the LVP with a painted on waterproofing membrane on top the plywood subfloor.
Anyone here with first hand experience with issues? How were you built if so?
I plan on putting down LVP since I have dogs and they scratched up the maple floor that was previously in the house. Now the LVP manufacturers are saying no more to raised home installations as they are seeing subfloor rot. I can see how the LVP on top of ply with closed cell insulation under the subfloor could create a moisture trap. I plan on using a mat such as DMX 1 Step 2.0 under the LVP with a painted on waterproofing membrane on top the plywood subfloor.
Anyone here with first hand experience with issues? How were you built if so?
2
Posted on 10/15/23 at 6:30 pm to GoAwayImBaitn
I’m curious as to where you’re seeing the info on no more LVP on raised subfloors?
Especially since I have one that was built 3 years ago.
Especially since I have one that was built 3 years ago.
Posted on 10/15/23 at 6:35 pm to Grassy1
I have a cousin who does flooring and he sent me this. Came off of one of the products he installs. Went to a flooring store the other day and the first thing they ask is "is this a raised home?"
Posted on 10/15/23 at 7:35 pm to GoAwayImBaitn
You only want one vapor barrier, if you have a water leak and water gets trapped between the vapor barriers, it will rot out all that sub flooring
Posted on 10/15/23 at 10:31 pm to wickowick
There aren't many floors that aren't some form of a vapor barrier though. Carpet and ??. Solid wood flooring would have very limited permeability even without a sealant.
If I was OP I would just go with whatever flooring and be extremely diligent about areas that can leak. You can buy battery operated water alarms you can under appliances and sinks. An automatic main water shutoff valve for when on vacation wouldn't be a bad idea if it isn't a huge deal to install. And be aware if a leak ever does occur, even for possibly a few hours, a lot of flooring will need to be pulled up and the subfloor dried.
If I was OP I would just go with whatever flooring and be extremely diligent about areas that can leak. You can buy battery operated water alarms you can under appliances and sinks. An automatic main water shutoff valve for when on vacation wouldn't be a bad idea if it isn't a huge deal to install. And be aware if a leak ever does occur, even for possibly a few hours, a lot of flooring will need to be pulled up and the subfloor dried.
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