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Applications > Perlite Concrete > Roof Decks > R-Value,
U-Factor, and Deadload Table
R-Value, U-Factor, and Deadload Table for Perlite Concrete Roofdecks
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 weight of 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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