HELP - laying hard wood floor over concrete

[Benyd]

I have a open living dining that I want to lay real oak 20mm thick, 200mm wide floor boards. There tung and grove and not engineered. The dinning room has a very dry concrete floor and the living room is suspended.

Is it possible to span both rooms with them being different based?

It's easy to lay over the suspended but what's the best way to do it over the concrete and not loose loads of head room?

 

[blup]

Use an underlay over both, it doesn’t have to be thick, just enough to cushion the floor. I did mine without the recommended dpm and it has been fine. Sweep the floor clean, you will find the underlay will take up slight undulations

 

[Benyd]

Use an underlay over both, it doesn’t have to be thick, just enough to cushion the floor. I did mine without the recommended dpm and it has been fine. Sweep the floor clean, you will find the underlay will take up slight undulations

Thank you. I think I'll do a liquid DPM on the concrete just to be sure. How did you connect the wood floor to the concrete? From my research I was thinking 5/8 inch plywood underneath then blind nail to that but that adds loads of height. Did you float or stick yours? Was your underlay just a breathable fabric to stop any creaking?

 

[blup]

Thank you. I think I'll do a liquid DPM on the concrete just to be sure. How did you connect the wood floor to the concrete? From my research I was thinking 5/8 inch plywood underneath then blind nail to that but that adds loads of height. Did you float or stick yours? Was your underlay just a breathable fabric to stop any creaking?

The self weight of the boards plus a flat floor. Just used an underlay that was thick enough to slightly cushion the boards. No floor is completely flat, so you will just be reproducing any slight slopes

 

[Benyd]

The self weight of the boards plus a flat floor. Just used an underlay that was thick enough to slightly cushion the boards. No floor is completely flat, so you will just be reproducing any slight slopes

You make it sound so easy. Everywhere else advises against a floating real wood floor and says it has to be glued or nailed

 

[blup]

You make it sound so easy. Everywhere else advises against a floating real wood floor and says it has to be glued or nailed

Ive assumed it is tongue and groove

 

[Benyd]

Ive assumed it is tongue and groove

Yes. But solid not engineered

 

[foxhole]

You could use self adhesive underlay .

Take a look at this video, ''
https://share.google/AnBi1WQQVn6GGlWtU

 

[crazydaze]

You can't float a solid tongue and groove floor so you will be sticking it down. You need to 6mm or 9mm Ply the wood side of the area, then Liquid DPM the concrete and screed to level of the Ply. Then Glue the solid wood flooring direct to the subfloor.