I live in a condo and am looking to replace an existing hardwood floor. I would have to glue down cork on the concrete and then glue a layer of 3/8" fire-treated plywood subfloor on top of the cork. A second layer of 3/8" plywood (in the opposite direction) would have to be put on top of the first layer, with the final hardwood on top. The wood floor would be prefinished bamboo.

What options do I have in terms of the glue? I've been told Bostik but that's pretty pricey and I'd like to know if there are other products out there of more or less comparable quality.

Also, what is (approximately) the price difference between fire-treated and non-fire treated plywood?

This is a concrete high-rise. How important is it to have fire-treated plywood?

Thanks in advance!

That seems over kill. Is the bambo engineered or soild? What state are you in? Is the fire rated plywood a state law or is the condo association saying it has to be. A little more iformation would help so we understand the whats and whys. Posts alittle more Thanks

I'm in Illinois (City of Chicago). I am not aware of a state law on this matter. I think it's the condo being finicky. They're also asking for 60 db and higher cork and that the plywood not penetrate the cork in any way! Thanks!

I've never heard it used in this scenerio. I don't get the reason. I can't see any fire affecting the plywood to begin with.

Not to mention the flooring is not going to be fire retardant.

Hi, Thanks for your replies. I got the sense that the fire-resistent plywood is somewhat "redundant". Any help on the glue question would also be highly appreciated!

I can't help you on the cork adhesive question because I don't have any experience with that.

I believe fire-treated plywood concern is because when plywood is treated, be it wolmanized PT or Fire-treated, it is usually very wet... unless it has been kiln dried "again" after the treatment.

Plywood subfloors and underlayments should not exceed 12% moisture content. If it comes to you at say 19% (or higher)...and you sandwich that wet layer between the cork and the underlayment, that would be very problematic.

I understand the assoc. makes you use it, but it will need to checked for moisture content, before you cover it up.

Poor guy ... Chicago .... doh!!

Thank you all for your comments! Appreciate it!