Hi all,
I’m in a quandary. My extension is 340mm from excavated ground to finished floor level. I will be installing underfloor heating so the order of materials from bottom up is as follows;
Hardcore
Sandbinding
DPM
Concrete slab
Sand binding to level imperfections
Rigid insulation
Underfloor heating embedded in 65mm screed
Tiles
The insulation I have bought is 100mm. With this in mind it means that with a concrete slab of 80mm, I would only have a hardcore layer of 75mm.
The ground is stable IMO. There are no large trees nearby etc, but as you can see I’m cropping the hardcore my 75mm and the concrete slab by at least 25mm.
Am I making a catastrophic error here. It wound be very inconvenient but I could exchange the insulation which is being delivered in a few days for 60mm rather than 100mm.
Any advice would be greatly appreciated. BTW excavating more soil out is not an option.
I’m in a quandary. My extension is 340mm from excavated ground to finished floor level. I will be installing underfloor heating so the order of materials from bottom up is as follows;
Hardcore
Sandbinding
DPM
Concrete slab
Sand binding to level imperfections
Rigid insulation
Underfloor heating embedded in 65mm screed
Tiles
The insulation I have bought is 100mm. With this in mind it means that with a concrete slab of 80mm, I would only have a hardcore layer of 75mm.
The ground is stable IMO. There are no large trees nearby etc, but as you can see I’m cropping the hardcore my 75mm and the concrete slab by at least 25mm.
Am I making a catastrophic error here. It wound be very inconvenient but I could exchange the insulation which is being delivered in a few days for 60mm rather than 100mm.
Any advice would be greatly appreciated. BTW excavating more soil out is not an option.