Floor construction with platon

[Saxpy]

I have an old garage where the slab is uninsulated. I have built a workshop at the far end of the garage that I want to be heated year round. I was thinking of laying a Platon mat, a substantial layer of foam insulation, and then 22mm chipboard on that to avoid the cold concrete slab.

Is it an OK construction to lay the chipboard floating or do you need to frame it up?

 

[mikaelbe]

We have done something similar in a room, but with thin Depron instead of foam. The chipboards were laid floating without battens. It should work without battens for you as well, as the floorboards are joined together and glued into a stable unit.

 

[Saxpy]

Anyone know if/where you can buy Platon mat by the meter? Buying a whole roll doesn't feel great when you only need a fraction.

...and how much cellplast should you lay before insulating unnecessarily?

 

[magnu]

Before you decide on platon, I recommend taking a look at Nivell or similar systems, I believe it's called Ghia.

I don't like the construction with platon, foam plastic, chipboard, as that type of floor risks becoming "soft." I think a joist floor is more stable.
But it's good enough for the lowest price (money and labor) that applies.

 

[Jan-Å]

We have Platon/cellplast but without floor particleboard in 2 rooms inside, so I haven't used "your" construction myself.
But the Platon mat has a lot of contact points with the floor, the cellplast is basically completely flat so with a whole board consisting of glued floor particleboard on top, it should be more stable than laying the floor particleboard on joists, right? It's 2 flat surfaces against each other lying on Platon + you should have a floor as well, I believe that will be at least as good as joists, the joists will also worsen the insulation.

 

[Saxpy]

Well, I'm going to lay some kind of floor on the sawdust afterwards, but I haven't decided what yet.

 

[magnu]

We have platon/styrofoam but without floor chipboard in 2 rooms inside so I haven't used "your" construction myself.
But the platon mat has a lot of contact points against the floor, the styrofoam is basically completely flat, so with a whole sheet consisting of glued floor chipboard on top, it should be more stable than laying the chipboard on joists, right? There are 2 flat surfaces against each other that lie on platon plus you'll have a floor too, I think that will be at least as good as joists, the joists will also reduce the insulation.

But that assumes that the floor under the platon mat is flat. Also, I have bought 75mm styrofoam that doesn't have the same dimension.

With platon required:
Even surface to lay the platon mat on.
Platon laid flat
Styrofoam sheets that have the same thickness on all edges. Easy to measure - measure the thickness in 2 places on each of the four edges of one or two sheets in the package.