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Home > Main Index > Markets >
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Applications > Perlite Concrete > Reroofing and Roof Renovation
> R-Value1,
U-Factor2 And Deadload Table3
Perlite Concrete for Reroofing and Roof Renovation
Prepared by: The Perlite Institute
R-VALUE1, U-FACTOR2 AND DEADLOAD TABLE3
BASED ON 1:6 MIX RATIO, 24-30 PCF PERLITE INSULATING CONCRETE |
2 INCHES OF
PERLITE CONCRETE
OVER POLYSTYRENE
THICKNESS IN INCHES |
DEPTH OF CORRUGATIONS |
STRUCTURAL
CONCRETE 4 INCHES |
| 26 GAUGE 15/16 INCH |
24 GAUGE 1-5/16 INCH |
22 GAUGE 1-1/2 INCH |
| R |
U |
D.L. |
R |
U |
D.L. |
R |
U |
D.L. |
R |
U |
D.L. |
| 0 |
3.9 |
.187 |
5.87 |
4.1 |
.177 |
6.65 |
4.1 |
.180 |
6.85 |
3.1 |
.216 |
4.00 |
| 1 |
7.9 |
.106 |
6.20 |
8.2 |
.103 |
6.98 |
8.1 |
.104 |
7.18 |
7.2 |
.115 |
4.33 |
| 2 |
11.7 |
.075 |
6.28 |
12.0 |
.074 |
7.06 |
12.0 |
.074 |
7.26 |
11.0 |
.080 |
4.41 |
| 3 |
15.6 |
.058 |
6.36 |
15.9 |
.058 |
7.14 |
15.8 |
.058 |
7.34 |
14.9 |
.061 |
4.49 |
| 4 |
19.4 |
.048 |
6.44 |
19.7 |
.047 |
7.22 |
19.7 |
.047 |
7.42 |
18.7 |
.049 |
4.57 |
| 5 |
23.3 |
.040 |
6.52 |
23.6 |
.040 |
7.30 |
23.5 |
.040 |
7.50 |
22.6 |
.042 |
4.65 |
| 6 |
27.1 |
.035 |
6.60 |
27.4 |
.035 |
7.38 |
27.4 |
.035 |
7.58 |
26.4 |
.036 |
4.73 |
FOOTNOTES:
- R Values are expressed as 0F.ft2h/Btu.
- U Factors expressed as Btu/h.ft20F. Includes air
films and roofing.
- Dead Loads include weightof metal, polystyrene and perlite concrete roof
insulation. Dead loads of structural concrete are not included.
NOTES:
- Insulation values are for summer conditions, heat flow down. To calculate winter
conditions, heat flow up, substract 0.39 from the R-value, then add 1.5 for air films and
roof, and divide into 1 for the U-value.
- U factors are based on series-parallel heat flow caluculations defined in the
ASHRAE Handbook of Fundamentals and on test data by recognized, independent test
laboratories. Thermal conductivities of roof deck components are based on 400F
mean temperature except perlite concrete which is based on 750F.
- Perlite concrete properties are bsed on constant thickness insulation. For sloped
insulattion, calculate average thickness.
- The U factors shown are calculations based on thermal conductivity data derived
from laboratory testing of dry materials in accordance with ASTM Specification C 177. The
values shown are intended only as guidelines. Actual insulation performance for all
materials and systems is affected by design of building, environment, and installation,
and will be lower than calculated values.
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