Floor construction

[hoppo4.2]

I'm in the process of digging out the floors in my 1880's place. The plan is to install a Dpm and underfloor heating.

The question is do I dig it out put in insulation then Dpm then concreet then pipes and screed

Or do I just have a solid slab with Dpm then insulate on top and clip the pipes to that?

I guess I'm asking do I need to but insulation in the sub floor or not?

[B17NNS]

DPM
Concrete
Insulation
UFH
Screed

[JCB123]

B17NNS said:

DPM
Concrete
Insulation
UFH
Screed

This - or

DPM
Insulation
Concrete with U/F Heating Pipes

This has a better thermal mass, which suits UFH.....i.e. the concrete holds the temperature better than a thin screed.

But both are fine.

[dickymint]

JCB123 said:

B17NNS said:

DPM
Concrete
Insulation
UFH
Screed

This - or

DPM
Insulation
Concrete with U/F Heating Pipes

This has a better thermal mass, which suits UFH.....i.e. the concrete holds the temperature better than a thin screed.

But both are fine.

From my experience it's down to the individual builing inspectors preference.

It always seems daft to put screed on top of Kingspan but hey-ho it works I suppose.

[Grandad Gaz]

dickymint said:

JCB123 said:

B17NNS said:

DPM
Concrete
Insulation
UFH
Screed

This - or

DPM
Insulation
Concrete with U/F Heating Pipes

This has a better thermal mass, which suits UFH.....i.e. the concrete holds the temperature better than a thin screed.

But both are fine.

From my experience it's down to the individual builing inspectors preference.

It always seems daft to put screed on top of Kingspan but hey-ho it works I suppose.

It works well actually

It means you are not heating up the concrete as well as the screed

[dickymint]

Grandad Gaz said:

dickymint said:

JCB123 said:

B17NNS said:

DPM
Concrete
Insulation
UFH
Screed

This - or

DPM
Insulation
Concrete with U/F Heating Pipes

This has a better thermal mass, which suits UFH.....i.e. the concrete holds the temperature better than a thin screed.

But both are fine.

From my experience it's down to the individual builing inspectors preference.

It always seems daft to put screed on top of Kingspan but hey-ho it works I suppose.

It works well actually

It means you are not heating up the concrete as well as the screed

I realise that. It's just the fact that you can lay screed over such a flimsy/collapsible material that gets me. Just seems wrong.