Concrete Floor. Underfloor heating, engineered covering

[Dan Robinson]

Hi there,

Bit a quandary on this one.

Solid concrete slab with dense gypsum board on top with UFH pipes set inside the boards.

Common pipe runs filled with sand cement.

Thin layer of foam underlay rolled out on top of the pipes.

Then an engineer floor laid on top of that.

In some places, especially near the skirting and where the original floor meets the new extension (block and beam) there is a distinct bounce.

We also have, where the pipes run in groups and through doorways, dipping.

Now we laid the UFH panels and infilled the gaps around the pipes.

Builders then paid a floor company to come in put the underlay and engineered floor down.


Soooo.

We're wondering who is ultimately responsible for the bounce, and how much is acceptable.

Some parts of the floor have no UFH and still have issues.

Could one argue that the floor people shouldn't have laid the wood if the sub floor was inadequate? Or is it our responsibility (as heating guys) to ensure a suitable surface to lay onto?

TIA!

P.S.

I should add that there are some gaps appearing in the butt joints too. THe floor guy did try and fill them but they have cracked since.

 

[doitall]

Sounds crazy Dan, normally you would have 65mm + screed over the pipes/insulation.

 

[Dan Robinson]

This is an overlay system. You're supposed to put finished floor straight on top.

 

[doitall]

Don't think it's supposed to have a foam underlay over the pipes first though, and I've never seen cement between the pipes as you describe,

Ones we've done have alu plates that fit into groves in the insulation and the pipe clips into the trays. vapor sheet over the top and floating floor.