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Carter Holt Harvey Woodproducts Australia >
R-Flor® Radiant Barrier Flooring
R-FLOR® RADIANT BARRIER FLOORING
Technical Data :
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R-Flor Radiant Barrier Flooring
 a) Low emittance metallised foil surface (underside of board)
- Increases overall "Total R-value" of the flooring system
- Perforated to provide sheet stability and drying
b) Blue protective film (topside of board)
- Protects against moisture ingress
- Robust - sufficient to withstand normal building activity
- Removable - designed to peel away prior to installation of surfacing materials and provides ideal base for decorative surface finishes such as timber strip flooring
- No residual film adhesive
c) Blue wax edge sealant
- Additional protection against moisture ingress at joins
- Easy identification
Termite Treated
- H2 Termite protected flooring
- 25 year chemical supplier guarantee
R-Flor Product Range
| Description |
Sheet Dimensions |
Max Joist Spacing |
Item No. |
| R-Flor Yellow Tongue |
3600 x 900 x 19 mm |
450 |
452256 |
| R-Flor Red Tongue |
3600 x 900 x 22 mm |
600 |
452257 |
| R-Flor Blue Tongue* |
3600 x 600 x 25 mm |
600 |
452258 |
* Made to order
 How R-Flor works
Heat energy always migrates in the direction of high to low temperature. The heat transfer can be by conduction, convection or radiation. At the underside surface of a floor the heat flow (up or down) is governed by convection and radiation.
Convection allows heat from the flooring material to flow into (or from) the subfloor air, while radiation heat transfer occurs between the underside of the floor and the other surfaces it can "see" across the air space. In the case of a floor this is mainly the ground.
Disconnected (Blocked) Cavity Detail
The ability of a material's surface to give off radiant heat is described by its emittance. The lower the emittance of a material, the lower the heat radiated from its surface. Low-emittance high-reflectance surfaces significantly reduce the radiative heat transfer across an air space.
The combined effect of convection and radiation heat transfer from a surface is described by the surface or air film thermal resistance. This value depends on orientation of the surface, direction of heat flow, air movement across the surface and the nature of the surface. Standard values to be used in the calculation of heat transfers through building elements are given in Australian Standard AS 4859.1.
The underside air film resistance of R-Flor is significantly higher than normal flooring and this contributes to an increase in the overall R-value of the floor system.
| R-Flor Yellow Tongue - Total R-Values |
| Cavity |
Floor Covering |
Enclosed Subfloor |
Unenclosed Subfloor |
| Blocked(disconnected) |
Bare |
1.75 |
1.16 |
| Carpeted |
2.16 |
1.57 |
| Unblocked(connected) |
Bare |
1.36 |
1.16 |
| Carpeted |
1.77 |
1.57 |
Notes:
- R-Values for heat flow down, standard brick veneer construction. Typical suburban location, floor height 0.5 m. hyJOIST® 240mm joist. Ground floor area/perimeter: 180m2/72m. Clay soil type.
- R-Values calculated in accordance with the relevant provisions of Australian Standard AS/NZS 4859.1-2002. Materials for the thermal insulation of buildings Part 1: General criteria and technical provisions and the International Standards Organisation standard ISO 13370-2005. Thermal performance of buildings-Heat transfer via the ground- Calculation Methods is used as the methodology for determining the R-Value of suspended floors.
- Assumption for carpet: 10 mm carpet, 10 mm underlay both with a conductivity of 0.05 W/m²K.
R-Flor Calculator
 As part of Carter Holt Harvey's research and development program, The University of Adelaide was commissioned to evaluate the thermal performance of timber flooring and to establish Total R-Values for timber flooring systems incorporating R-Flor (as summarised in table above).
The R-Flor - Total R-Value Calculator has been developed to assist designers assess the thermal performance of R-Flor and various suspended timber flooring systems and options quickly and easily for both enclosed and unenclosed situations.
For a free copy of the R-Flor - Total R-Value Calculator contact Cater Holt Harvey or visit the website at www.chhwoodproducts.com.au/r-flor
Thermal Insulation
As particleboard flooring is a relatively light-weight wood product, when used as part of a floor system, it is a useful thermal insulator. It has a low thermal capacity (specific heat is approximately 2.1 kJ/kg.K) and, like natural timber, gives a feeling of warmth and comfort.
- The thermal conductivity of general purpose particleboard flooring is 0.12 W/mK. The thermal resistance "R" values for the nominated thicknesses are:
Thickness (mm)
Product |
19 mm Yellow Tongue |
22 mm Red Tongue |
25 mm Blue Tongue |
Thermal resistance
R-Values m²K/W |
0.16 |
0.18 |
0.21 |
How insulation performance is calculated
R-Value
Also known as the overall thermal resistance, it rates the performance of a building element or system as an insulator (i.e. ability to restrict heat flow) - the higher the R-value, the greater the insulating effect and expressed using metric units m²K/W, where:
- m² = one metre squared of the material of a specified thickness;
- K = one degree temperature difference (Kelvin or Celsius) across a material; and
- W = the amount of heat flow across the material in watts
The overall thermal resistance of a suspended floor system is given as:RT = RF + Rgx
Where:
RT is the overall R-Value of the floor system, m²K/W
RF is the thermal resistance of the suspended part of the floor, m²K/W
Rgx is the thermal resistance of the combined ground heat flow and the equivalent thermal resistance between underfloor space and the outside air, accounting for heat flow through subfloor walls and by ventilation of the underfloor space, m²K/W.
The Thermal Resistance of the suspended floor platform RF includes surface thermal resistances of the air on either side of the building element. This may be calculated by the expression;
RF = Rsi + R1 + R2 + . . . . . + Rn + Rse
Where: RF is the total resistance
Rsi is the internal surface resistance;
R1, R2, ....Rn are the thermal resistances of each layer, including bridged layers;
Rse is the external surface resistance.
R-Flor Material Properties
| Reflective Foil |
| Emissivity |
0.05 (nominal) |
| Reflectivity |
0.95 |
| Foil Thickness (metallic coating) |
9 microns |
| Particleboard Flooring |
| Density |
710 kg/m³ (typical) |
| Sheet Dimensions |
3600 x 900 mm (std sheet size) |
| Thermal Conductivity |
0.12 W/mK |
| Specific Heat |
2.1 kJ/kg.K (approx) |
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All products contained herein © Carter Holt Harvey Woodproducts Australia. Page layout © 1996-2008 Architecture Media (Selector) Pty Ltd.
All rights reserved.
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