Page 90 - Glow Insulation Product Guide
P. 90

Solid Ground Floor insulated below groundbearing slab with Quinn Therm QF
Design and Installation
Installing thermal insulation below the slab brings the thermal mass of slab within the insulated envelope, giving the building a steady thermal response.
Where radon control measures are required, a gas-resistant membrane should be specified for the dpm. The gas-resistant membrane should extend to the outer faces of all external walls. Cavity walls will require gas-resistant cavity trays.
Quinn Therm QF boards should be butted tightly together, to give a continuous layer across the whole floor. Boards should be cut neatly around service penetrations to minimise heat loss.
To prevent thermal bridging at the perimeter of the floor a continuous run of Quinn Therm QF boards should be fitted vertically against the perimeter walls, for the whole depth of the slab. The edge insulation should be at least 25mm thick and the exposed top edge should be protected from damage until covered by the wall finish and/or skirting. Insulation in perimeter walls should extend at least 150mm below the top of the floor insulation.
A polyethylene slip sheet should be laid across the insulation, to isolate it from the slab and prevent concrete working down between boards. The slip sheet will also function as a VCL, reducing the risk of condensation forming beneath the insulation.
Quinn Therm QF must be protected from damage while the concrete slab is being poured.
• Suitable
refurbishment projects.
for new build and
•Quinn Therm QF has a high compressive strength to withstand the dead and imposed loads transmitted through the slab. It is suitable for domestic and most commercial applications.
• Quinn Therm QF is durable, with a service life comparable to that of the building.
• Quinn Therm QF has a low thermal conductivity, minimising the thickness required to achieve the design U-value.

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