Sticking wood floor to concrete???

[dave_s13]

I'm planning on starting to lay my new oak wood floor at the weekend. It's 18mm thick T&G.

The "issue" is the different substrated involved. It's 75% new chipboard type floorboards in the new extension, 10% old floor board and the remaining 15% is a screed poured over the old kitchen concrete floor (to level it up).

The chipboard and floor board bit is easy. I'll just secret nail it using the floorboard nailer.

Can anyone recommend some specific products for glueing down the screeded portion though. The number of different types/brands of ashesive is confusing. Fecked if I know??!!

[B17NNS]

Sikabond T54

[Mad Dave]

Do you need to stick it? Could you not just like it as a 'floating floor' like laminate/veneer flooring?

[Mad Dave]

Do you need to stick it? Could you not just like it as a 'floating floor' like laminate/veneer flooring?

[dave_s13]

Mad Dave said:

Do you need to stick it? Could you not just like it as a 'floating floor' like laminate/veneer flooring?

I want to stick it really. Theory being that if this smaller patch is floating but the rest securely nailed then any expansion/contraction of the wood might mean I end up with some weird, incinsistent bowing/gapping just in this area.

I'm not sure though. In theory it shouldn't move that much in that direction...might shrink a bit though????

[Tacagni]

If you are going to fully bond it then the sikabond is a good adhesive

[dave_s13]

Thanks.

It's not cheap is it? This is a good thing mind....must be good gear.

[Tacagni]

Make sure you have damp tested the concrete floor and primed the floor. In fact make sure everything is spot on. You do not want any problems

[dave_s13]

Tacagni said:

Make sure you have damp tested the concrete floor and primed the floor. In fact make sure everything is spot on. You do not want any problems

The concrete floor in the old kitchen has been down for 80 years and it felt (and looked) dry as a bone. The screed was laid about 4 weeks ago and is fully cured (only about 1.5" at it's thickest point).

Only issue I can see (which may not be an issue) is the screed is levelled exactly as the wooden floor portions. I'm assuming the adhesive can be spread very thinly, in order to maintain the level as much as possible i.e. within a couple of mm or so?? I would imagine the flooring will have enough natural give in it to accomodate the adhesive underneath it?

[Tacagni]

The adhesive can be troweled on so should not be a problem, you might want to put a liquid dpm on the concrete floor though

[dave_s13]

Do Sikabond sell a compatible DPM or have a helpline you can ring for advice (as per BAL)?

[Tacagni]

Sikabond do a dpm 2.5kg/10m2 or 10kg/40m2

[dave_s13]

Cheers fella.

I assume you do this for a living??

[Tacagni]

sure do

[dave_s13]

Well, in that case.....

Can you sell me some cheap (but top quality) DPM and adhesive please

It's feckin pricey isn't it

[Tacagni]

Just had a quick look on fleabay price for T54 is about right (use the best you can afford)