Suspended timber floor construction


When insulating your suspended timber floors, SuperFOIL has the perfect solution to minimise draughts, moisture absorption, and ensure it’s suitable for the weight capacity of the floors.


SuperFOIL’s thin multifoil range is ideal for floors with limited depth, and it doesn’t add weight to your floors. With a built-in vapour resistance of 1200MNs/g, you can choose from a range of multifoil solutions that best suit your build-up without compromising performance, functionality, space, and design.

SuperFOIL’s flexibility extends to its application; you can use it on its own, in single/duet configurations, or in combination with traditional insulation types like mineral wool or PIR boards.

Direct Application

Begin by positioning SuperFOIL at the edge of the wall, leaving an overlap folded up the wall, and roll SuperFOIL out over the joists. For an air cavity, secure SuperFOIL to the side of the joist, about 50mm from the top, using the correct staples and batten if needed. Continue rolling and securing at each joist, creating air cavities across the entire floor.

Butt joint lengths on top of the joist, stapling securely, and use SuperFOIL 100mm tape to seal all joints. Trim SuperFOIL around the joists at the perimeter and seal to the wall plate or Cavity wall insulation if present. Finish by taping any tears or cuts. Proceed to install your chosen flooring following the manufacturer’s recommendations.

Battened Application

Begin at the edge of the wall, leaving an overlap of the product folded up the wall, and roll SuperFOIL out over the joists. While rolling out the product, ensure it is held taut and staple it into place at 50mm-100mm intervals.

Butt joint lengths on top of the joist and staple them securely into place. Seal all joints, tears, and holes with SuperFOIL 100mm tape to ensure an airtight finish.

To complete the installation, use the correct size battens to batten the product before placing your internal flooring finish.

Best Products for Suspended Timber Floor Application


SF19+ SF40 SF60
Core performance 1.63 R Value 2.57 R Value 3.58 R Value
Roof Performance* 2.27 R Value 3.47 R Value 4.42 R Value
Wall Performance* 2.73 R Value 3.91 R Value 4.88 R Value
Floor Performance* 4.37 R Value 5.22 R Value 6.53 R Value
Emittance 0.05 0.05 0.05

*Core value + 2 air spaces / EN 16012

SF19+ SF40 SF60
Thickness (Nominal) 45mm 65mm 100mm
Length 10m 10m 8m
Width 1.2m/1.5m 1.5m 1.5m
Coverage 12m²/15m² 15sqm 12m²
Weight 10kg/13kg 15kg 17.75kg

*Core value + 2 air spaces / EN 16012

SF19+ SF40 SF60
Reaction To Fire (Euroclass) Class E Class E Class E

*Core value + 2 air spaces / EN 16012

SF19+ SF40 SF60
Water Vapour Resistance 2,500MNs/g 2,500MNs/g 2,500MNs/g
Resistance To Water Penetration W1 W1 W1
Tensile Properties (Length) 757/ 784 N/50mm 757 N/50mm 757/ 784 N/50mm
Tensile Properties (Width) 726 / 757 N/50mm 726 N/50mm 726 / 757 N/50mm
Resistance to Tearing (Length) 450N 450N 450N
Resistance to Tearing (Width) 491N 491N 491N
Elongation (Length) 15% / 17% 15% / 17% 15% / 17%
Elongation (Width) 14% / 16% 14% / 16% 14% / 16%
Flexibility at Low Temp. -40°C -40°C -40°C

*Core value + 2 air spaces / EN 16012

SF19+ SF40 SF60
Reinforced Heavy Duty Double Foil Laminated Outer Layers 2 2 2
Mesh Reinforced Foil Laminated Outer Layers 0 0 0
Aluminium Coated Reflective Foil PET Layers 4 8 11
Thermo Foam Separation Layers 0 0 0
Loft Quilt 80g/sqm Layers 5 9 12
Total Layers 11 19 25

*Core value + 2 air spaces / EN 16012

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