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Concrete Slab Glue Down Vapor Barrier?

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Concrete Slab Glue Down Vapor Barrier? Mark 07-11-2006
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Posted by Mark on July 11, 2006, 9:41 am
I need some guidance from the group. I have an existing slab on grade
and I'm hoping to install engineered wood flooring. Most likely glue
down. I received some advice from an installer to glue down a vapor
barrier underlayment first then glue the wood flooring to the vapor
barrier. Sounded strange to me. He said there was flooring underlayment
product intended for the job....but I have not found anything yet. Any
suggestions?
thanks
Mark


Posted by Bob Morrison on July 11, 2006, 10:33 am
In a previous post Mark wrote...
> I need some guidance from the group. I have an existing slab on grade
> and I'm hoping to install engineered wood flooring. Most likely glue
> down. I received some advice from an installer to glue down a vapor
> barrier underlayment first then glue the wood flooring to the vapor
> barrier. Sounded strange to me. He said there was flooring underlayment
> product intended for the job....but I have not found anything yet. Any
> suggestions?
>

There is a plywood underlayment available that has a built-in vapor
barrier. I suspect that is the product the installer has in mind. You
will most likely not find this product in a big box store, but will need
to go to a "regular" lumber store.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by Muff on July 11, 2006, 5:52 pm
Mark, there should be a vapor barrier under the slab, get a moisture meter
and check the moisture content of the concrete. If cured properly and it has
a vapor barrier under the slab you should be good to go and glue the
engineered wood to the concrete. I had my new home done this way a year ago
and have no problems. I'm in Tampa Florida.
Muff


> I need some guidance from the group. I have an existing slab on grade
> and I'm hoping to install engineered wood flooring. Most likely glue
> down. I received some advice from an installer to glue down a vapor
> barrier underlayment first then glue the wood flooring to the vapor
> barrier. Sounded strange to me. He said there was flooring underlayment
> product intended for the job....but I have not found anything yet. Any
> suggestions?
> thanks
> Mark
>



Posted by John Reddy on July 12, 2006, 6:57 am

> Mark, there should be a vapor barrier under the slab, get a moisture meter
> and check the moisture content of the concrete. If cured properly and it has
> a vapor barrier under the slab you should be good to go and glue the
> engineered wood to the concrete. I had my new home done this way a year ago
> and have no problems. I'm in Tampa Florida.
> Muff
>

You don't need a moisture meter. Take a one foot square piece of
polyethyne sheeting and duct tape it to the slab on all four sides. If
there is moisture under it after 24 hours, you need a vapor barrier.

Posted by Glenn on July 12, 2006, 10:31 am


>
> You don't need a moisture meter. Take a one foot square
> piece of polyethyne sheeting and duct tape it to the slab
> on all four sides. If there is moisture under it after
> 24 hours, you need a vapor barrier.

I would suggest you do that after a prolonged wet spell.

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