INSULATION REQUIREMENTS
FOR ROOFS
(a) Flat roof, skillion roof and For Class 1 Residential Dwellings Tocathedral ceiling — Ceiling linin Comply With The BCA 2010 DTS
Edition 4-2010 Master Builders Executive Council President – Ross Barrett Treasurer – Simon Butt Commercial Builders Council Chair – Sam DeLorenzo Civil Contractors Council Chair – Peter Middleton Residential Builders Council Chair – Andrew Kerec Professional Consultants Council Chair – Hans Sommer Suppliers and Subcontractors Council Chair – Peter Fairburn Master Builders Management team Executive Director – John Miller Deputy Executive Director – Jerry Howard Director Industrial Relations – Mike Baldwin Senior Management Accountant – Louise MacCallum Senior Manager - Marketing & Membership Services – David Leitch Master Builders Group Training General Manager – Wendy Tengstrom
In Climate Zone 7, which covers the ACT, the direction of heat-flow is upwards. We have included some typical roof structures with an upper surface solar absorptance value of greater than 0.4, but not more than 0.6.
minimum insulation, based on the above criteria, is R4.6 less the (a) Flat roof, skillion roof and cathedral ceiling — Ceiling lin allowance for the building elements.
The Total R-Value of the roof and ceiling construction is based on there (b) Flat roof,below skillion roof and cathedral ceiling — Exposed ra being a roof space. If the roof space is filled, the roof space R-Value needs to be subtracted from the Total R-Value of the roof and ceiling materials.
We have included the required added insulation for the typical roof types which can be made up of sarking material and insulation. The required a) Flat roof, skillion roof and cathedral ceiling — Ceiling lining under rafter
roof with flat ceiling — ceiling Tiled roof (b) c) FlatPitched roof, skillion roof and cathedral — Exposed
UNVENTILATED
UNVENTILATED
VENTILATED
0.41
0.23
0.48
(c) Pitched roof with flat ceiling — Tiled roof
(a) Flat roof, skillion roof and cathedral ceiling — Ceiling lining under rafter
Unventilated
Down
0.4
Up
0.3
(c) Pitched roof with flat ceiling — Tiled roof (a) Flat roof, skillion roof and cathedral ceiling — Ceiling lining under rafter
Unventilated
Down (b) Flat roof, skillion roof and cathedral ceiling — Exposed (d) rafters Unventilated Pitched roof with flat ceiling — Metal roof
Added insulation = 4.6 – 0.23 = R4.27 Down without sarking and with sarking R4.19
Added insulation = 4.6 – 0.48 = R4.12
b) Flat roof, skillion roof and cathedral ceiling — Exposed rafters UNVENTILATED
UNVENTILATED
(b) Flat roof, 0.38 skillion roof and cathedral ceiling — Exposed rafters
0.39
VENTILATED Unventilated 0.21 Up Down
0.3 0.44
(d) Pitched roof with flat ceiling — Metal roof
(c) Pitched roof with flat ceiling — Tiled roof
The Total R-Value of the roof and ceiling construction in F the roof space is filled, the roof space R-Value needs to b ceiling materials.
Ventilated
Down Up
Unventilated
Up
Down Up
(c) Pitched roof with flat ceiling — Tiled roof
1
0.4
d) Pitched roof with flat ceiling — Metal Up roof 0.36
1.
Master Builders Association of the ACT 1 Iron Knob St, Fyshwick ACT 2609 PO Box 1211, Fyshwick ACT 2609 Tel: (02) 6247 2099 Fax: (02) 6249 8374 Email: canberra@mba.org.au Web: www.mba.org.au
0.48
Added insulation = 4.6 – 0.38 = R4.22
Ventilated
1.
The Total R-Value of the unventilated roof and ceiling construction for tiled roofs are based on there being sarking-type material
(d) Pitched roof with flat ceiling — Metal roof
Down
0.7
0.2 0.38
0.5
0.4
0.74
insulation = 4.6 0.39ceiling = R4.21 TheAdded Total R-Value of the roof– and construction in Up 0.23 andspace R4.39isfor ventilated space the roof filled, the roof roof space R-Value needs to ceiling materials. Unventilated Down 0.56
which would prevent ventilation of theUp roof Ventilated Down 0.410.7 space through the gaps in the roof tiles. Unventilated
Up
0.2
Down
0.5
Up
0.3
INSULATION REQUIREMENTS
FOR WALLS (c)
2. 2.
Clay masonry veneer
For Class 1 Residential Dwellings To Comply With The BCA 2010 DTS
The Total R-Value of the unventilated roof and ceiling construction in Figure 3.12.1.1(c) for tiled roofs are based on there being sarking-type material which would prevent ventilation of the roof space through the gaps in the roof tiles. R-Value of the unventilated roof and ceiling construction in Figure 3.12.1.1(c) for tiled roofs are based The Total
on there being sarking-type material which would prevent ventilation of the roof space through the gaps in the roof tiles. TOTAL R-VALUE FOR TYPICAL WALL CONSTRUCTION Total 2. The Total R-Value of the unventilated roof and ceiling construction in Figure 3.12.1.1(c) for tiled roofs are based Figure 3.12.1.3 TOTAL R-VALUE FOR TYPICAL WALL CONSTRUCTION wall construction description Ron there being sarking-type materialExternal which would prevent ventilation of the roof space through the gaps in the External wall construction description Value roof tiles. Total Figure 3.12.1.3 TOTAL R-VALUE FOR TYPICAL WALL CONSTRUCTION Ra) Weatherboard (a) Weatherboard External wall construction description d) Cavity clay masonry (e) Cavity clay masonry Value Total Figure TOTAL R-VALUE FOR TYPICAL WALL CONSTRUCTION (a) 3.12.1.3 Weatherboard RExternal wall construction description Value (a)
Weatherboard 0.48
Total R-Value
0.48 Total R-Value
0.48
0.69 0.48
(b) (b)
(b)
Fibre cement sheet
b) Fibre cementsheet sheet Fibre cement
(f)
e)Externally Externally insulated masonry insulated clayclay masonry
Fibre cement sheet (f)
0.42
Externally insulated clay masonry
0.42
0.42 (c) (c)
(c)
Total R-Value
Clay masonry veneer
0.42
Clay masonry veneer veneer c) Clay Claymasonry masonry veneer
Total R-Value (g)
(g)
Autoclaved aerated concrete masonry
0.53
f)Autoclaved Autoclaved aerated concrete masonry aerated concrete masonry 0.56 0.56
(e)
Cavity clay masonry
(e)
Cavity clay masonry
0.56
Total R-Value
2.42
0.56 (e)
Total R-Value
Added required insulation for some typical wall types Clay brick veneer R2.24 Weather board R2.32 0.69 Fibre cement sheet R2.38 Added insulation R2.11 for some typical wall types Cavity required clay masonry 0.69
Cavity clay masonry
Added required insulation for some typical wall types listed Clay brick veneer R2.24above Weather board
R2.32
Clay brick veneer
cementclay sheet R2.24 Fibre Cavity masonryR2.38 R2.11
Weather board
R2.32
Fibre cement sheet
R2.38
Cavity clay masonry
AAC Masonry
R2.11
R0.38
Note: Added insulation can be made up with sizlation, bulk insulation or any approved product with the specified R value
2
0.69