PDF | 1 MB - Australian Building Codes Board
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JAMES M FRICKER PTY LTD Report i150b <strong>Australian</strong> <strong>Building</strong> <strong>Codes</strong> <strong>Board</strong><br />
Total R<br />
JMF insulation Total Total R<br />
Calc. CLAD WALLS & THERMAL BREAKS path overall loss<br />
150.11b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R1.8 BULK INSULATION & R2.04 R1.66 19%<br />
PLASTERBOARD (70MM METAL STUD ON 450MM CENTRES)<br />
(Base case: Bulk insulation not overlapping frame. R0.2 thermal break.)<br />
150.12b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R1.8 BULK INSULATION & R2.04 R1.37 33%<br />
PLASTERBOARD (70MM METAL STUD ON 450MM CENTRES)<br />
(Bulk insulation not overlapping frame. No thermal break.)<br />
Comparing this with JMF 150.11b, it is evident that the lack of an R0.2 thermal break has<br />
reduced overall Total R from R1.66 to R1.37.<br />
150.13b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R2.65 BULK INSULATION & R2.89 R1.66 43%<br />
PLASTERBOARD (70MM METAL STUD ON 450MM CENTRES)<br />
(Bulk insulation not overlapping frame. No thermal break.)<br />
Comparing this with JMF 150.11b, it is evident that R1.8 bulk insulation must be replaced with <br />
R2.65 insulation if there is no R0.2 thermal break. (There may not be room for this level of bulk<br />
insulation.)<br />
150.14b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R1.5 BULK INSULATION & R1.74 R1.67 4%<br />
PLASTERBOARD (70MM METAL STUD ON 450MM CENTRES)<br />
(Bulk insulation not overlapping frame. No thermal break but steel washers used as flange<br />
standoffs.)<br />
Comparing this with JMF 150.11b, with reduced thermal bridging area, R1.5 bulk insulation can <br />
replace R1.8 insulation for the same overall Total R. (And without an R0.2 thermal break.)<br />
(Steel stud flanges not connecting to cladding except via washer standoffs.)<br />
150.111b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R2.72 BULK INSULATION & R2.96 R2.20 26%<br />
PLASTERBOARD (100MM METAL STUD ON 450MM CENTRES)<br />
(Base case: Bulk insulation not overlapping frame. R0.2 thermal break.)<br />
2nd reference case having R0.2 Thermal Break.<br />
150.121b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R2.72 BULK INSULATION & R2.96 R1.80 39%<br />
PLASTERBOARD (100MM METAL STUD ON 450MM CENTRES)<br />
(Bulk insulation not overlapping frame. No thermal break.)<br />
Comparing this with JMF 150.111b, it is evident that the lack of an R0.2 thermal break has<br />
reduced overall Total R from R2.2 to R1.8.<br />
150.131b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R4.22 BULK INSULATION & R4.46 R2.20 51%<br />
PLASTERBOARD (100MM METAL STUD ON 450MM CENTRES)<br />
(Bulk insulation not overlapping frame. No thermal break.)<br />
Comparing this with JMF 150.111b, it is evident that R2.72 bulk insulation must be replaced <br />
with R4.22 insulation if there is no R0.2 thermal break. (There may not be room for this level of <br />
bulk insulation.)<br />
150.141b CEMENT SHEET CLADDING, VPS ON METAL FRAME WITH R2.1 BULK INSULATION & R2.31 R2.20 5%<br />
PLASTERBOARD (100MM METAL STUD ON 450MM CENTRES)<br />
(Bulk insulation not overlapping frame. No thermal break but steel washers used as flange<br />
standoffs.)<br />
Comparing this with JMF 150.111b, with reduced thermal bridging area, R2.1 bulk insulation <br />
can replace R2.2 insulation for the same overall Total R. (And without an R0.2 thermal break.)<br />
(Steel stud flanges not connecting to cladding except via washer standoffs.)<br />
NOTES:<br />
The above shows Total R determinations based upon AS/NZS 4859.1:2002/Amdt 1 2006, Materials for the thermal<br />
insulation of buildings.<br />
See individual calculations for further commentary.<br />
Results current as at 30/04/2009
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