Type of concrete for underfloor heating ?

[hemglass]

What type of concrete is preferable when you want a quick-drying concrete that is ready for tile laying quickly? I have previously used Ardex A35, but is there anything else equivalent and preferably cheaper?

 

[Silver78]

Weber dry-mix 85 is probably one type, but I have no idea if it's cheaper. It costs around 150-170 SEK per bag. I only use this variant if it's absolutely necessary. It's so easy to get plastic cracks in this if you don't do it right. Plus, it's expensive too.

 

[hemglass]

Root concrete? Is that the kind of concrete that is preferred for, for example, short drying time and when embedding underfloor heating pipes?

 

[Matti_75]

Depends entirely on what you are going to cast.

 

[hemglass]

Pouring a floor

 

[C.Lundin]

Cast a floor

A floor or a vault/slab?
If you're just going to "cast" a floor, self-leveling compound is preferred.

 

[hemglass]

Well.. I'm going to do a topping of a concrete slab where I've placed pipes and reinforcement on the existing slab. I guess that topping must be at least 5cm. So filler is not an option then.

 

[C.Lundin]

Well.. I'm going to do a topping on a concrete slab where I've laid tubing and reinforcement on the existing slab. I guess the topping needs to be at least 5cm. So self-leveling compound is out then.

Why should the topping be done and why is it reinforced? Is it something required for the construction? Most self-leveling compounds can be applied up to 50mm in one go, otherwise, you can do it in stages. If you just need to reach a certain height, you could throw out EPS concrete and then lay the underfloor heating and cover it with the compound.

We need a bit more info to give concrete suggestions. Generally speaking, 50 mm is too thin to cast.