Sub-floor board

[Simons70]

I have to raise the floor in bathrooms with 109 mm before tiles.
The client want use Knauf dry screed board (23mm) before tiles.
What suitable substrate for tiles, as we want to avoid the subfloor construction moving or collapsing in the future ?

 

[Andy Allen]

You can get 50mm insulation boards ...Maybe double them up ..

 

[Simons70]

You can get 50mm insulation boards ...Maybe double them up ..

I find this but I don't know if is suitable and how can be fixed.
Kingspan Insulation Boards,70mm 4 sheets or 11.52m 2

 

[widler]

Im a bit confused ? But why not construct a timber floor ?

 

[Simons70]

Im a bit confused ? But why not construct a timber floor ?

Im a bit confused ? But why not construct a timber floor ?

Offices bathrooms,concrete floor,around 120 sqm floors in total.Ask us to sort out...

 

[Andy Allen]

Kingspan is what they put under floating floors.....not sure it would be suitable to tile to.

 

[Simons70]

Kingspan is what they put under floating floors.....not sure it would be suitable to tile to.

Anything suitable?

 

[Chalker]

View attachment 86853
I find this but I don't know if is suitable and how can be fixed.
Kingspan Insulation Boards,70mm 4 sheets or 11.52m 2

That's exterior insulation for attaching to the building and rendering. Not sure if it has much strength in compression.
Like above, two layers of 50mm adhesives together , or 50mm kingspan with 59mm liquid, or sand/cement screed.

Personally the insulation board will be quicker. Lay one layer, then the next one at 90degrees.

 

[Dumbo]

Offices bathrooms,concrete floor,around 120 sqm floors in total.Ask us to sort out...

120 sqm pump in liquid screed on top of celotex

 

[Simons70]

120 sqm pump in liquid screed on top of celotex

I suggest but seems to be too heavy.

 

[hmtiling]

It's the 50mm marmox sandwich then

 

[Dumbo]

Is it suspended floor then

 

[Simons70]

It's the 50mm marmox sandwich then

I find marmox now,60 mm is what I need.How can be fixed on concrete floor,like usual,adhesive and screws?

 

[hmtiling]

I find marmox now,60 mm is what I need.How can be fixed on concrete floor,like usual,adhesive and screws?

On solid floors I've always just fixed with adhesive. I've only used marmox up to 20mm on floors so id ring their technical ti be safe

 

[Chalker]

Redone plenty of shower trays 100mm thick. But never sat a bath on it, so would need to be titled fully under a bath.