Rvalue Edition 2 Roofs

8/7/2019 Rvalue Edition 2 Roofs

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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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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 3.8 3.7 Metal 3.6 3.7


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R2. PITCHED ROOF, REFLECTIVE FOIL LAMINATE (RFL), FLAT CEILING, (Without and with) BULK INSULATION BETWEENJOISTS


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 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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R3. PITCHED ROOF, FLAT CEILING, BULK INSULATION BETWEEN JOISTS, CONCERTINA RFL ON TOP OF BULK INSULATION


(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



Tiles 4.5 4.2 Metal 4.3 4.3


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R4. PITCHED ROOF, THERMO-CELLULAR REFLECTIVE INSULATION, FLAT CEILING, (Without and with) BULK INSULATIONBETWEEN JOISTS


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 4.4 4.0 Metal 4.5 4.0



Tiles 5.1 4.8 Metal 5.3 4.9


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R5. PITCHED ROOF, FLAT CEILING, RIGID BULK INSULATION OVER JOISTS


(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


Tiles 5.0 4.5 Metal 5.0 4.6


Tiles 5.5 5.1 Metal 5.5 5.1


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R6. PITCHED ROOF, FLAT CEILING, CONCERTINA RFL BETWEEN JOISTS


(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


(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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R8. METAL ROOF, CEILINGS WITH EXPOSED RAFTERS, BULK INSULATION &RFL


(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


Slope: 15o

to 35o


R9. TILED ROOF, CEILINGS WITH EXPOSED RAFTERS, BULK INSULATION


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


7. Plasterboard

8. Exposed rafter R3.0 bulk insulation 3.0 3.2

Slope: 15o

to 35o



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R10. TILED ROOF, CEILINGS WITH EXPOSED RAFTERS, FOIL-BACKED POLYSTYRENE BOARD INSULATION



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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R11. METAL ROOF, RAKED CEILING WITH CONCEALED RAFTER, RFL, (Without and with) BULK INSULATION


(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



R12. TILE ROOF, RAKED CEILING WITH CONCEALED RAFTER, BULK INSULATION



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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R13. METAL ROOF, RAKED CEILING WITH CONCEALED RAFTER, THERMO-CELLULAR REFLECTIVE INSULATION, (Withoutand with) BULK INSULATION


(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




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R14. TILE ROOF, RAKED CEILING WITH CONCEALED RAFTER, THERMO-CELLULAR REFLECTIVE INSULATION, (Without andwith) BULK INSULATION



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


Rvalue Edition 2 Roofs

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