Hi,
First time posting so apologies if I break any rules or social norms...
We are looking to install a retrofit UFH system to our bedrooms which sit on top of an uninsulated/unheated garage space below.
Current floor buildup is:
- 150mm precast concrete beam floor
- 38mm screed topping.
No space to add insulation above the slab without having to raise external glazing that goes to floor so current plan is to insulate the soffit with about 150mm PIR (max. before restricting head height of garage below) and replace the 38mm screed topping with the following:
- 20mm retrofit UFH (Wunda rapid response)
- 7mm Wunda duoboard
- 11mm UFH compatible carpet underlay
- low tog Carpet
I appreciate that this will likely mean a less responsive UFH system as it will be heating the 150mm slab but hoping the insulation below will still retain enough heat to make the system effective.
Really just looking for a critique of the above plan, any thoughts or suggestions welcome.