Vapor Barrier for Laminate Flooring


  #1  
Old 09-19-23, 10:43 PM
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Vapor Barrier for Laminate Flooring

hi all!

tried doing some research about vapor barriers and didn't really find a clear cut yes/no. seems like it's dependent on a variety of factors.

wanted to know what you guys thought about my situation:

1) ground floor: subfloor is plywood over concrete. plan on using a vapor barrier (there was already one when i removed the old laminate floor)

2) 2nd floor: subfloor is plywood. was not planning on putting vapor barrier. it's just a master bedroom and master closet. i did vapor barrier in the bathrooms with vinyl planks.

i bought some laminate flooring from costco when it was on sale. and was reading the installation instructions but they don't really go over vapor barriers much.

https://www.costco.com/mohawk-home-w...3atownview+oak

i live in Seattle. so somewhat humid.

thanks!
 
  #2  
Old 09-20-23, 04:56 AM
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Most concrete will sweat some, so a vapor barrier over the plywood could hold moisture in and cause the plywood to mold.
 
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Old 09-20-23, 06:28 AM
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How old was the old floor over the concrete.
If the plywood is good (no rot) then I would use a vapor barrier again.

I would not change what has worked in the past. You just have to check that it actually worked.
 
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Old 09-20-23, 08:46 PM
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thanks for the advice. so far from the planks i've pulled up the plywood still looks like it's in good condition. no rot or mold but will definitely be cognizant of it now.

thanks!
 
 

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