Polystyrene instead of studs+chipboard?

[jon_h]

EPS insulation with concrete on top? You probably mean EPS insulation with self-leveling compound on top? Why concrete

But.. EPS insulation is exactly the same thing as Styrofoam. I thought we already covered why not to use self-leveling compound on Styrofoam.

EPS Cement otherwise sounds like the safest option if weight isn't an issue? Sounds like I should read up a bit on EPS Cement...

As I said, the weight of regular concrete is probably not a problem, and this only weighs one-fifth.

Is it "forbidden" to use studs+floor chipboard+fiber-reinforced self-leveling compound after July 1st as a floor construction?

No, absolutely not. Why do you ask? Gluing floor gypsum will not be allowed in wet rooms eventually, though.

 

[B6304S1]

Ok, now I've read through it again

I've also read up on EPS cement, and it seems absolutely right to pour "all the way" up to the leveling level and skip the foam entirely.
(Especially considering that the concrete slab isn't completely even, which would mean I'd have to level the slab before covering it with foam...)

The reason I'm wondering if it would be "forbidden" to go with joists + chipboard is that;

Since chipboard is an organic material, there should be a risk of problems with the chipboard as well as the plasterboard if there would be moisture migration through the sealing layer. Edit
(I assume that's why the requirements have been changed to moisture-resistant materials instead, such as minerit or masterboard)

* Risk of the paper on the plasterboard getting moldy
* Risk of the chipboard "rising" (?)

It was my inspector who thought it would be better to skip the "organic" option since I have the opportunity to do so.

However, the decisive question that remains for me is whether there is a huge price difference.

Option 1 Joists + Chipboard 5m2
Option 2 EPS cement 100mm on 5m2

Do you have any idea about the price?

Best regards,
Kim

 

[jon_h]

If there wouldn't be any moisture migration through the waterproofing layer? You mean if there would be, I assume.. Well, the slight moisture migration that can occur since no waterproofing layer is vapor-tight can be handled by the chipboard and wooden structure without problems. It is completely allowed and will surely work excellently to do so in your case. But I agree with the inspector that it's better to use inorganic materials if you have the opportunity; the margins become much larger then, both against execution errors and against potential damage to the waterproofing layer. I think you should go with inorganic, even if it's a bit more expensive. I don't know what EPScement costs off the top of my head, so I can't compare, though.

Edit: Found it on Fredells' webshop, would guess the consumer pays around 200 for 50 liters of EPScement. Gives a cost of a couple of thousand in your bathroom. Joists, glue, chipboard flooring, and mounting plate for the drain might be a third or half of that.

 

[Watchmen]

I had used Styrolit and it doesn't sink at all. But S80 cellplast works on the boards, I don't really see why it wouldn't work in the bathroom. S80 sinks very little even under several tons of pressure.

 

[jon_h]

Watchmen, no one has said that S80 or better EPS doesn't work in bathrooms.

By the way, what do you mean by several tons of pressure? On what surface?

 

[Watchmen]

we use 4 pcs of s80 skiver when laying down 7-15 ton walls on the ground; the skiver only sinks around 10mm, which is quite good for such a light material. We often use it as a layer between different plates when we send them away... cheaper than strö

 

[B6304S1]

I have decided to cast with EPS Cement. But I have a few more questions...

The plan is to use both waterborne floor heating and supplement with electric heating for summer operation.

I plan to use PEX pipes.

* What diameter of the PEX pipe should I use? (12 or 20 mm?)
* Which type of electric floor heating; T2 Blue or the really thin one that lies on a pre-made mat intended to be cast into the fix?

* Where should I cast the PEX pipe into the construction? (I understand it shouldn't be cast into the EPS cement). Is it okay to cast it into the fiber-reinforced levelling compound? Then the levelling compound will be very thick if you need to have 3 cm above the PEX pipe...

Or are there other possibilities?

Thanks in advance!

Best regards, Kim