Install-Wood-Floors.com

With the work you have already done, it sounds as if it maybe too tightly fitted around the edges not allowing any expansion with moisture/temperature differences

You have to wait at least 60 days before installing solid wood flooring over a concrete slab, and even after that you should test for moisture before installation. Depending on where your floor is (at grade or below grade) it may be more or less susceptible to moisture problems. Another possible problem is poor installation. There should be a gap between the floor and the walls, and between the floor and any obstructions such as posts, to allow the floor to expand as needed. If it cannot expand it will buckle.

Engineered wood flooring is less susceptible to moisture problems and expansion problems because of its construction. It is very stable and more suited to use over a concrete slab, particularly below grade. The flooring can be installed by nailing it in place or as a floating floor (that’s what you’d choose over concrete).

How to Install a Floating Floor,,1055047,00.html?xid=yahoo-answers&partner=yes

Check the link below for recommendations about installing solid wood flooring over concrete.

Hi, when you relaid the floor did you have the under side of the wood cleaned off. It sounds to me that the under side of the wood is already sealed by previous layers of bonding agents and there is no way for bonding agent to properly get absorbed into the wood.

Your problem is the moisture in the concrete slab. If it is below grade (slab below level of outside ground) you should have not attempted any floor that use glue as it will eventually fail below grade.
We always ask our flooring subcontractor to do a moisture test on any concrete slab job we are in charge of.
They cut 4-5 16″ squares of clear plastic and duct tape them over the slab in different areas. Wait 24 hours and then pull up plastic squares. If there is any moisture on the underside of the plastic or on the slab-we will not install any flooring that requires adhesive. We will apply a sealer to this concrete and then install pad and carpet or floating floor but only under the understanding that we cannot guarantee moisture problems even with sealing the concrete.
We always place 6mil visqueen(plastic) under slabs to keep moisture from wicking up through the ground and into the concrete, then we also like to seal the top of the slab with a sealer.
Most flooring manufacturers will not honor a warranty on the floor if it is below grade installation. They do have suggested installation procedures for on slab above grade, but this can still be open to problems sometimes.
The only other thing you might try is to seal the backside of all the flooring materials with a high quality polyurethane 2 coats.
I am wondering how you delt with doorways when you raised floor up using plywood and the finish wood floor, and transitions into other floor levels?

You said solid wood floors..Are you saying 3/4 ” flooring? If so this must be nail down and obviously you can t do that on cement. Engineered flooring is the only way to go over cement. You can glue or nail this down ( over plywood subfoor) You cannot always do a floating floor w/ a engineered wood unless its specialy made to do so. Some are , some are not. When the flooring is fixed or repaired where is the glue? Mostly on the floor? If so moisture may not be the trouble since it will still bond to the wood. If its the other way around ( stuck to the wood ) then maybe you do and it s “blowing” off the glue from the hydrostatic pressure. Any questions you can e mail me GL