I bought some 3/4 inch Brazilian Cherry plants 2/1/4 inch wide from a friend at a special price. I planned to glue them down to my concrete slab. Now I am being told by everyone that I cannot glue them directly to the slab, but must have a subfloor over the concrete. The adhesive dealers say that the thickest plank that can be glued down is 5/8". I don't understand why I can't glue down 3/4"

Ya, that's the way it reads. Personally, I won't gluedown a 3/8 solid, over concrete.


Are you fishing for someone to say it is OK? You won't find it here.

http://www.sikaconstruction.com/tds-cpd ... T55-us.pdf

This adhesive manufacturer says 3/4" solid over concrete is fine.

That is the nastiest glue I have ever used. Better have a respirator and some eye protection from the fumes! You also better have the substrate as flat as 1/16 in 10 feet or your going to have massive hollow spots, as it sags/slumps and doesn't hold ridges.


With that said, call Sika, and see just what they warranty as far as gluing solids down.

Elmers glue can make that same claim, too!!!!

Now call the wood manufacturer and see what they say about gluing their solid to concrete, and if they will stand behind it!!!!! That's who matters!

I spoke with the SIKA rep about gluing down 3/4" solid to concrete and he affirmed what Perry said. That the slab needs to be nearly perfectly flat and that there IS NOT a moisture warranty.. All SIKA warrants is that the adhesive won't "fail", whatever that means. You'd get nearly the same performance from any quality urethane flooring adhesive like Chemrex, Bostik's or Franklin.

I was talking with a rep for a hardwood company out of the bay area and he was telling me his products can be glued. I will try to get documentation before they sell it as a glue down. I will need it before I even think about putting it down, along with moisture and cc tests for my protection. And they are saying to use the sika glue(I think the name of the company might sum up the other issues with it). I would rather use bostics or taylor if it does the same thing.

You can use Stauf and get a lifetime guarantee.

I'm having a new house built on a concrete slab and I'm going to use a 5/8 engineered product. I personally would never glue down a solid piece of wood to concrete.....no matter what any manufactuer said about their glue product and warranty. The newer 5-7 ply stuff with a thicker top layer that can be sanded and refinished if necessary is the way to go. It looks and feels just like solid, but it will be a lot more stable to work with.