Installing Vinyl Plank Question

I did this in my house last year. 1200 sq ft of it and it was very easy and came out looking great. I read conflicting opinions as you did, I ended up just doing the visqueen to have that extra piece of mind.

I bought from Daltile and they recommended it.

I think different manufacturers have different recommendations. I'd read your specific instructions for your product.

My house is pier and beam. Whole house was installed with LVP, no visqueen. 2.5 years later, no issues.

We got moisture up through our slab (possible AC sucking it up or high water table) that ruined our previous flooring (black mold spots popping up all over). We pulled up 1200 SQFT sealed the slab with sealant, put visquene, and used LVP with the moisture proof backing.

You never know how much protection you need until you need it.

Visquene is cheap.

Moisture weeping up through slab is a common problem. First check to see if a plastic barrier is built into your slab. On my house you can find exposed small bits of heavy black plastic sticking out of the concrete mostly in corners where it was harder to trim the excess. Second, if no built-in barrier check for weeping. A common test is to lay a square of clear plastic sheeting directly on an exposed section of slab...maybe 5'x5'. Tape or weight down the edges and wait a few days. If the covered slab gets damp or you get condensation under the sheet you need a barrier. Weeping is most likely next to an outside wall.

My house was built by DSLD and they did have the plastic barrier before pouring the slab

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My house was built by DSLD

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You can pick up a 2 in 1 for like 100sf at home Depot for like $40. I would put it under the LVP just for inexpensive peace of mind

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sealed the slab with sealant

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This is the best way.

110% put moisture barrier. Contractor didn’t on install (conflicting info per contractor; I read installation manual which states to use it in high moisture environments) and they popped up after a year. Get the lovely task of ripping out and replacing flooring for basically the entire house this fall. Not sure specifically which LVP you have, ours specifically was stone composite core which is brittle. When the moisture caused it to warp, the locking mechanisms cracked off causing the movement.

Save $15?