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R-values for timber framed building elements - roofs Page
Pitched roof, flat ceiling 7
R1. Bulk insulation between joists
R2. Reflective foil laminate (RFL) plus bulk insulation between joists
R3. Bulk insulation between joists, concertina RFL on top of bulk insulation
R4. Thermo-cellular reflective insulation (TCRI) plus bulk insulation between joists
R5. Rigid bulk insulation over joists
R6. Concertina RFL between joists
Pitched roof, raked ceiling 13
R7. Metal roof, exposed rafters, foil-backed blanket
R8. Metal roof, exposed rafters, bulk insulation & RFL
R9. Tiled roof, exposed rafters, bulk insulation
R10.Tiled roof, exposed rafters, polystyrene board insulationR11. Metal roof, concealed rafters, bulk insulation
R12. Tile roof, concealed rafters, bulk insulation
FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1)
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PRESENTATION OF RESULTS
Roof/CeilingsFor roof/ceiling elements the R-values are presented for the two directions ofheat flow, DOWNand UP.
.
R8. METAL ROOF, CEILINGS WITH EXPOSED RAFTERS, BULK INSULATION &RFL
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP
1. Metal decking R1.5 bulk insulation 1.6 1.72. Sarking
3. Bulk Insulation R2.0 bulk insulation 2.0 2.24. Vapour barrier
5. Timber batten R2.5 bulk insulation 2.4 2.6
6. Ceiling lining
7. Exposed rafter R3.0 bulk insulation 2.9 3.1
Slope: 15o
to 35o
R3.5 bulk insulation 3.3 3.5
Notes: 1) Heat flow DOWN means the heat flows into the internal spaces of the building.
2) Heat flow UP means the heat flows from the internal spaces of the building.
3) RFL may be corrugated as shown or sheets fixed to joists
Heat flow DOWN
(Hot Weather)
Heat flow UP
(Cold Weather)
Description of element
FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 7
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 8
R1. PITCHED ROOF, FLAT CEILING, (Without and with) BULK INSULATION BETWEEN JOISTS
Total R-value for roof/ceiling
(m2
K/W)
Heat flow DOWN Heat flow UP1. Roof cladding No bulk insulation2. Attic space (non-reflective) Tiles 0.8 0.43. Bulk insulation Metal 0.6 0.44. Timber ceiling joists R1.5 bulk insulation5. Plasterboard Tiles 2.2 1.9 Metal 2.0 1.9 R2.0 bulk insulation
Tiles 2.6 2.4Metal 2.4 2.4
R2.5 bulk insulation
Tiles 3.0 2.8 Metal 2.8 2.9 R3.0 bulk insulation
Tiles 3.4 3.3 Metal 3.2 3.3 R3.5 bulk insulation
Tiles 3.8 3.7 Metal 3.6 3.7
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 9
R2. PITCHED ROOF, REFLECTIVE FOIL LAMINATE (RFL), FLAT CEILING, (Without and with) BULK INSULATION BETWEENJOISTS
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP1. Roof cladding No bulk insulation2. Airspace (non-reflective) Tiles 1.9 1.23. RFL Metal 1.9 1.24. Attic space (reflective) R1.5 bulk insulation
5. Bulk insulation Tiles 3.2 2.76. Timber ceiling joists Metal 3.2 2.87. Plasterboard R2.0 bulk insulation
Tiles 3.6 3.2 Metal 3.6 3.3 R2.5 bulk insulation
Tiles 4.0 3.6 Metal 4.0 3.7
R3.0 bulk insulationTiles 4.4 4.1
Metal 4.4 4.2 R3.5 bulk insulation
Tiles 4.8 4.5 Metal 4.8 4.6 1.9 1.2
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 10
R3. PITCHED ROOF, FLAT CEILING, BULK INSULATION BETWEEN JOISTS, CONCERTINA RFL ON TOP OF BULK INSULATION
Total R-value for roof/ceiling
(m2
K/W)
Heat flow DOWN Heat flow UP1. Roof cladding R1.5 bulk insulation2. Attic space (semi-reflective) Tiles 2.9 2.43. Concertina RFL Metal 2.8 2.54. Air space (reflective) R2.0 bulk insulation5. Bulk insulation Tiles 3.3 2.96. Timber ceiling joists Metal 3.2 3.07. Plasterboard R2.5 bulk insulation
Tiles 3.7 3.4Metal 3.6 3.4
R3.0 bulk insulation
Tiles 4.1 3.8 Metal 3.9 3.8 R3.5 bulk insulation
Tiles 4.5 4.2 Metal 4.3 4.3
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 11
R4. PITCHED ROOF, THERMO-CELLULAR REFLECTIVE INSULATION, FLAT CEILING, (Without and with) BULK INSULATIONBETWEEN JOISTS
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP1. Roof cladding No bulk insulation2. Airspace (non-reflective) Tiles 2.2 1.53. Thermo-cellular reflectiveinsulation
Metal 2.3 1.54. Attic space (reflective) R1.5 bulk insulation5. Bulk insulation Tiles 3.5 3.06. Timber ceiling joists Metal 3.7 3.17. Plasterboard R2.0 bulk insulation
Tiles 4.0 3.5 Metal 4.1 3.6 R2.5 bulk insulation
Tiles 4.4 4.0 Metal 4.5 4.0
R3.0 bulk insulation
Tiles 4.8 4.4 Metal 4.9 4.5 R3.5 bulk insulation
Tiles 5.1 4.8 Metal 5.3 4.9
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 12
R5. PITCHED ROOF, FLAT CEILING, RIGID BULK INSULATION OVER JOISTS
Total R-value for roof/ceiling
(m2
K/W)
Heat flow DOWN Heat flow UP1. Roof cladding R1.5 bulk insulation
2. Airspace (non-reflective) Tiles 3.6 3.03. RFL Metal 3.5 3.04. Attic space (reflective) R2.0 bulk insulation
5. Bulk insulation Tiles 4.1 3.56. Airspace (non-reflective) Metal 4.0 3.67. Timber ceiling joists R2.5 bulk insulation
8. Plasterboard Tiles 4.5 4.0Metal 4.5 4.1
R3.0 bulk insulation
Tiles 5.0 4.5 Metal 5.0 4.6
R3.5 bulk insulation
Tiles 5.5 5.1 Metal 5.5 5.1
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 13
R6. PITCHED ROOF, FLAT CEILING, CONCERTINA RFL BETWEEN JOISTS
Total R-value for roof/ceiling
(m2
K/W)
Heat flow DOWN Heat flow UP1. Roof cladding One layer of foil batts
2. Airspace (non-reflective) Tiles 2.6 1.8
3. RFL Metal 2.6 1.8
4. Attic space (reflective) Two layers foil batts at right angles
5. Concertina RFL Tiles 3.3 2.4
6. Airspace (reflective) Metal 3.3 2.47. Timber ceiling joists
8. Plasterboard
R7. METAL ROOF, CEILINGS WITH EXPOSED RAFTERS, FOIL-BACKED BLANKETOR THERMO-CELLULAR REFLECTIVEINSULATION
Total R-value for roof/ceiling
(m2K/W)
Heat flow DOWN Heat flow UP1. Metal decking
2. Foil-backed blanket orthermo-cellular reflectiveinsulation (reflective foil DOWN)
TCRI 1.2 0.9
3. Timber battens R1.5 insulating blanket 1.7 1.8
4. Plasterboard5. Exposed rafter R2.0 insulating blanket 2.1 2.3
Slope: 15o
to 35o
R2.5 insulating blanket 2.6 2.7
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 14
R8. METAL ROOF, CEILINGS WITH EXPOSED RAFTERS, BULK INSULATION &RFL
Total R-value for roof/ceiling
(m2
K/W)
Heat flow DOWN Heat flow UP1. Metal decking
2. Sarking R1.5 bulk insulation 1.6 1.7
3. Bulk Insulation
4. Vapour barrier R2.0 bulk insulation 2.0 2.2
5. Timber batten
6. Plasterboard R2.5 bulk insulation 2.4 2.67. Exposed rafter
R3.0 bulk insulation 2.9 3.1
Slope: 15o
to 35o
R3.5 bulk insulation 3.3 3.5
R9. TILED ROOF, CEILINGS WITH EXPOSED RAFTERS, BULK INSULATION
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP1. Tiles
2. Timber tile battens R1.5 bulk insulation 1.8 1.93. RFL
4. Bulk insulation R2.0 bulk insulation 2.2 2.45. Counter battens
6. Breathable buildingmembrane
R2.5 bulk insulation 2.6 2.8
7. Plasterboard
8. Exposed rafter R3.0 bulk insulation 3.0 3.2
Slope: 15o
to 35o
R3.5 bulk insulation 3.4 3.7
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 15
R10. TILED ROOF, CEILINGS WITH EXPOSED RAFTERS, FOIL-BACKED POLYSTYRENE BOARD INSULATION
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP1. Tiles
2. Timber tile battens Expanded polystyrene3. Airspace (non-reflective) 10mm 1.8 1.64. RFL 15mm 2.0 1.75. Counter battens
6. Reflective airspace Extruded polystyrene7. Polystyrene board 25mm 2.5 2.28. Plasterboard 30mm 2.7 2.49. Exposed rafter
Slope: 15o
to 35o
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 16
R11. METAL ROOF, RAKED CEILING WITH CONCEALED RAFTER, RFL, (Without and with) BULK INSULATION
Total R-value for roof/ceiling
(m2K/W)
Heat flow DOWN Heat flow UP1. Metal roofing
2.RFL No bulk insulation 1.5 1.33. Timber roofing batten
4. Airspace (Reflective) R1.5 bulk insulation 2.6 2.45. Bulk insulation
6. Timber rafter R2.0 bulk insulation 3.0 2.97. Vapour barrier
8. Plasterboard R2.5 bulk insulation 3.5 3.5
Slope: 15o
to 35o
R3.0 bulk insulation 4.0 4.0
R3.5 bulk insulation 4.5 4.5
R12. TILE ROOF, RAKED CEILING WITH CONCEALED RAFTER, BULK INSULATION
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP1. Tiles
2. Timber tile batten R1.5 bulk insulation 2.1 2.2
3. RFL4. Timber rafter R2.0 bulk insulation 2.5 2.65. Bulk insulation
6. Vapour barrier R2.5 bulk insulation 3.0 3.27. Plasterboard
R3.0 bulk insulation 3.5 3.7Slope: 15
oto 35
o R3.5 bulk insulation 3.9 4.2
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 17
R13. METAL ROOF, RAKED CEILING WITH CONCEALED RAFTER, THERMO-CELLULAR REFLECTIVE INSULATION, (Withoutand with) BULK INSULATION
Total R-value for roof/ceiling
(m2K/W)
Heat flow DOWN Heat flow UP1. Metal roofing
2. Thermo-cellular reflective insulation No bulk insulation 1.3 1.03. Timber roofing batten
4. Airspace (Reflective) R1.5 bulk insulation 2.7 2.65. Bulk insulation
6. Timber rafter R2.0 bulk insulation 3.2 3.17. Vapour barrier
8. Plasterboard R2.5 bulk insulation 3.7 3.6
Slope: 15o
to 35o
R3.0 bulk insulation 4.2 4.2
R3.5 bulk insulation 4.6 4.7
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FWPRDC: R-values for Timber Framed Building Elements (Edition 2.1) 18
R14. TILE ROOF, RAKED CEILING WITH CONCEALED RAFTER, THERMO-CELLULAR REFLECTIVE INSULATION, (Without andwith) BULK INSULATION
Total R-value for roof/ceiling(m2K/W)
Heat flow DOWN Heat flow UP1. Tiles
2. Timber tile batten No bulk insulation 1.2 1.03 Thermo-cellular reflective insulation
4. Timber rafter R1.5 bulk insulation 2.8 2.6
5. Bulk insulation6. Vapour barrier R2.0 bulk insulation 3.2 3.27. Plasterboard
R2.5 bulk insulation 3.6 3.6Slope: 15
oto 35
o R3.0 bulk insulation 4.2 4.2
R3.5 bulk insulation 4.7 4.7
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