SUSPENDED SLAB
Suspended slabs are a popular choice for strong, durable flooring in residential, commercial and industrial buildings. However, without effective insulation, they can become a major source of heat loss, making the spaces above colder and driving up energy costs.
Foilboard Insulation provides a high-performance solution designed specifically for suspended slab applications. Whether you're working on a new build or upgrading an existing structure, Foilboard helps deliver superior thermal performance, year-round comfort and long-term energy savings.
INSTALLATION ACCESSORIES
**Foilboard Insulation Panel Dimension: 240mm x 1200mm (2.88m2)**
Total System R Values Underfloor Direct Fix
FOILBOARD PANEL | HEAT FLOW DOWN | HEAT FLOW UP |
|---|---|---|
GREEN 50 | Rt2.9 | Rt2.2 |
GREEN 40 | Rt2.7 | Rt2.0 |
GREEN 20 | Rt2.2 | Rt1.6 |
System Description: 180mm concrete slab (k=1.44), direct fix Foilboard panel to underside of slab, enclosed subfloor 500mm. Ground thermal resistance based on sub floor ventilation area per perimeter length 6000mm2/m = R0.58 heat flow out and R0.56 heat flow in. Foilboard installed anti-glare side up. Fully sealed airspace assumes no dust cover on upward facing surfaces. Enclosed cavity to prevent air ingress. Calculated per AS/NZS 4859, Part 1&2 2:2018.
If elements of construction vary from that described, this may produce a different thermal resistance result.
Total System R Values Underfloor Batten Fixing
FOILBOARD PANEL | REFLECTIVE AIRSPACE ABOVE FOILBOARD | HEAT FLOW DOWN | HEAT FLOW UP |
|---|---|---|---|
GREEN 50 | 28mm | Rt3.6 | Rt2.6 |
GREEN 40 | 28mm | Rt3.4 | Rt2.4 |
GREEN 20 | 28mm | Rt2.9 | Rt1.9 |
System Description: 180mm concrete slab (k=1.44), 28mm x 38mm x 0.55 BMT space 600mm c/c, Foilboard insulation to underside of battens, anti-glare facing up, enclosed subfloor 500mm. Ground thermal resistance based on sub floor ventilation area per perimeter length 6000mm2/m = R0.58 heat flow out and R0.56 heat flow in. Foilboard installed anti-glare side up. Fully sealed airspace assumes no dust cover on upward facing surfaces. Enclosed cavity to prevent air ingress. Calculated per AS/NZS 4859, Part 1&2 2:2018.
If elements of construction vary from that described, this may produce a different thermal resistance result.
​
Total System R Values Suspended Slab Ceiling
FOILBOARD PANEL | REFLECTIVE AIRSPACE ABOVE/BELOW FOILBOARD | HEAT FLOW UP | HEAT FLOW DOWN |
|---|---|---|---|
GREEN 50 | 20mm / 28mm | Rt2.4 | Rt2.9 |
GREEN 25 | 20mm / 28mm | Rt1.9 | Rt2.4 |
GREEN 15 | 20mm / 28mm | Rt1.6 | Rt2.2 |
System Description: 200mm suspended concrete ceiling. 20mm reflective sealed airspace above Foilboard, Foilboard installed anti-glare side up, 28mm reflective sealed airspace, Foilboard, 28mm x 38mm x 0.55 BMT battens spaced 600mm c/c, 10mm plasterboard. Fully sealed airspace assumes no dust cover on upward facing surfaces. Enclosed cavity to prevent air ingress. Calculated per AS/NZS 4859, Part 1&2 2:2018.
If elements of construction vary from that described, this may produce a different thermal resistance result.
​
DISCLAIMER All statements and technical information contained herein are based on tests we believe to be reliable, but the accuracy thereof is not guaranteed. Users assume all risk and liability resulting from the use of the product and must confirm the suitability thereof by their own calculations. Conditions of Sale contain a limited warranty against manufacturing defects. Where applicable, Foilboard GREEN should be installed per the National Construction Code (NCC), state building legislation and/or a performance solution.
Added Insulation R Values Underfloor Direct Fix
Added Insulation R Values Flexifast / Timber Joist
FOILBOARD PANEL | ADDED INSULATION HEAT FLOW DOWN | ADDED INSULATION HEAT FLOW UP |
|---|---|---|
GREEN 50 | R1.9 | R1.3 |
GREEN 40 | R1.7 | R1.1 |
GREEN 20 | R1.2 | R0.7 |
System Description: 180mm concrete slab (k=1.44), direct fix Foilboard panel to underside of slab, enclosed subfloor 500mm. Ground thermal resistance based on sub floor ventilation area per perimeter length 6000mm2/m = R0.58 heat flow out and R0.56 heat flow in. Foilboard installed anti-glare side up. Fully sealed airspace assumes no dust cover on upward facing surfaces. Enclosed cavity to prevent air ingress. Calculated per AS/NZS 4859, Part 1&2 2:2018. Added insulation R value includes the material insulation R value and the R values of the associated reflective airspaces within the insulation system pathway less non-reflective enclosed sub floor air film.
If elements of construction vary from that described, this may produce a difference thermal resistance result.
Added Insulation R Values Underfloor Batten Fixing
FOILBOARD PANEL | REFLECTIVE AIRSPACE ABOVE FOILBOARD | ADDED INSULATION HEAT FLOW DOWN | ADDED INSULATION HEAT FLOW UP |
|---|---|---|---|
GREEN 50 | 28mm | R2.6 | R1.7 |
GREEN 40 | 28mm | R2.4 | R1.5 |
GREEN 20 | 28mm | R1.9 | R1.1 |
System Description: 180mm concrete slab (k=1.44), 28mm x 38mm x 0.55 BMT space 600mm c/c, Foilboard insulation to underside of battens, anti-glare facing up, enclosed subfloor 500mm. Ground thermal resistance based on sub floor ventilation area per perimeter length 6000mm2/m = R0.58 heat flow out and R0.56 heat flow in. Foilboard installed anti-glare side up. Fully sealed airspace assumes no dust cover on upward facing surfaces. Enclosed cavity to prevent air ingress. Calculated per AS/NZS 4859, Part 1&2 2:2018. Added insulation R value includes the material insulation R value and the R values of the associated reflective airspaces within the insulation system pathway less non-reflective enclosed sub floor air film.
If elements of construction vary from that described, this may produce a difference thermal resistance result.
Added Insulation R Values Suspended Slab Ceiling
FOILBOARD PANEL | REFLECTIVE AIRSPACE ABOVE/BELOW FOILBOARD | ADDED INSULATION HEAT FLOW UP | ADDED INSULATION HEAT FLOW DOWN |
|---|---|---|---|
GREEN 50 | 20mm / 28mm | R2.1 | R2.6 |
GREEN 25 | 20mm / 28mm | R1.5 | R2.1 |
GREEN 15 | 20mm / 28mm | R1.3 | R1.9 |
System Description: 200mm suspended concrete ceiling. 20mm reflective sealed airspace above Foilboard, Foilboard installed anti-glare side up, 28mm reflective sealed airspace, Foilboard, 28mm x 38mm x 0.55 BMT battens spaced 600mm c/c, 10mm plasterboard. Fully sealed airspace assumes no dust cover on upward facing surfaces. Enclosed cavity to prevent air ingress. Calculated per AS/NZS 4859, Part 1&2 2:2018. Added insulation R value includes the material insulation R value and the R values of the associated reflective airspaces within the insulation system pathway non-reflective enclosed sub floor air film.
If elements of construction vary from that described, this may produce a difference thermal resistance result.
DISCLAIMER All statements and technical information contained herein are based on tests we believe to be reliable, but the accuracy thereof is not guaranteed. Users assume all risk and liability resulting from the use of the product and must confirm the suitability thereof by their own calculations. Conditions of Sale contain a limited warranty against manufacturing defects. Where applicable, Foilboard GREEN should be installed per the National Construction Code (NCC), state building legislation and/or a performance solution.