Can cork flooring be laid over laminate flooring that has been glued to a concrete floor?

I've never installed cork flooring, but if the laminate is firmly glued down, then it's no different from any other flooring installation where you glue one flooring down over another. So, I don't see why not. Gluing one flooring down over another glued down flooring is very common in the flooring installation business.

But, you should be aware that the old glue holding the laminate down to the concrete is the weakest link in the chain. Once that OLD glue starts to let go, that's the beginning of the end of the NEW cork flooring too. Ideally, it'd be best to remove the laminate and glue holding it down and glue the cork down to the concrete, but practical considerations always end up trumping ideals.

If there are any gouges or gaps in the old laminate, I'd fill them in with a cement based floor leveler (like Mapei "Planipatch" available at Home Depot) and sand the floor leveler down flush with the surrounding floor before glueing down the cork. Planipatch also has a recommended additive (pronounced "adhesive") called "Planipatch Plus". Basically the Plus additive is just a liquid glue that makes the Planipatch stickier and dry harder than it otherwise would. You don't need the Plus additive if you're spreading the Planipatch over wood or concrete, but I expect you'd need it to stick to laminate. Either that, or sand the old laminate down to roughen it's surface.

Planipatch shrinks as it dries, so you'll need two coats; the second to fill in the shrinkage.

I would glue a piece of cork down to your laminate in an inconspicuous area to make sure the glue you intend to use sticks to the laminate. If the glue works better than expected, you can always get that cork off your laminate with a sharp wood chisel and a hammer.

This message has been edited. Last edited by: Nestor,