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Old 08-01-2020, 07:03 AM   #1
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Vapor barrier under shed floor?


I keep reading various opinions on this so I thought Iíd get some opinions here. Iím going to be building a small storage shed about 10 x 12 and saw an article saying that a vapor barrier between the plywood and the floor joists is a good idea to help keep moisture getting into the shed and rusting your equipment.

The shed floor will be put on blocks about 4 to 6 inches above ground. I wasnít planning on putting any gravel or stone underneath it since itíll be off the ground several inches but I wasnít sure about the vapor barrier under the plywood is that a good idea?


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Old 08-01-2020, 07:18 AM   #2
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Re: Vapor barrier under shed floor?


If you aren't going to allow for any air circulation, I would want to keep the amount of moisture in that space to a minimum.
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Old 08-01-2020, 08:21 AM   #3
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Re: Vapor barrier under shed floor?


while i do not "know", i would say it can't hurt and may help. for the cost, cheap, do it. had i know about it, i would have done it to mine.
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Old 08-01-2020, 08:34 AM   #4
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Re: Vapor barrier under shed floor?


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while i do not "know", i would say it can't hurt and may help. for the cost, cheap, do it. had i know about it, i would have done it to mine.


I just wasnt sure if it would trap moisture below and accelerate the rot of the floor joists.


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Old 08-01-2020, 08:44 AM   #5
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Re: Vapor barrier under shed floor?


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I just wasnt sure if it would trap moisture below and accelerate the rot of the floor joists.


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is the area prone to flooding ?
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Old 08-01-2020, 11:16 AM   #6
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Re: Vapor barrier under shed floor?


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is the area prone to flooding ?


No, never seen any standing water in that corner of the yard.


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Old 08-01-2020, 11:27 AM   #7
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Re: Vapor barrier under shed floor?


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No, never seen any standing water in that corner of the yard.


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ground contact boards, up off the ground with airspace = your good to go.

oh, perhaps you should look into some kind of critter control.
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Old 08-01-2020, 12:13 PM   #8
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Re: Vapor barrier under shed floor?


Slope the dirt with a hump in the middle so water won't lay there cover the dirt with sheet poly and cover that with enough gravel to keep it in place.
That will stop moisture from coming up from the dirt and keep the weed grass from growing under there.

A T&G plywood floor is a vapour barrier.
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