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My basement floor was previously a combination of carpet and vinyl tile. There was no subfloor when I removed it. Both were just on the bare concrete slab. I have no moisture issues and the basement is always dry. Was thinking of laying down some peel and stick tiles. Is it ok to do so on the bare concrete as was done before? The previous tiles were probably put down in 1990 when the house was built.
 

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Basement walls and floors ALWAYS have moisture vapor passing through, that's why they look dry. If that vapor is blocked the moisture level will increase until the space under the tile is just as wet as the source of moisture. How much of a problem this will create is unknown so it falls back to you to try or use a more vapor permeable material/method.

Bud
 

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I have peel and stick tile in the basement bath and laundry room. Never had a problem.
 

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It might work and if it does not, you haven't lost a lot of money.
 
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