|
Details of
Construction |
8"
Ungrouted |
10"
Ungrouted |
12"
Ungrouted |
|
(1) No Insulated or Grout |
2.6 |
2.8 |
2.8 |
|
(2) Grouted Cores Without Insulation |
n/a |
n/a |
n/a |
|
(3) Cores Filled With Perlite Loose Fill |
6.7 |
7.9 |
9.2 |
|
(4) Cores Filled With Urea-Formaldehyde or Plastic Form |
7.1 |
8.4 |
9.7 |
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(5) Added R-Value To Any of the Above Walls: |
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- 2" x 2" wood furring
(24" o.c.) with 1 1/2" think molded polystyrene and 1/2"
gypsum board
|
5.5 |
5.5 |
5.5 |
| |
- 2" x 2" wood furring (24" o.c.) with 1 1/2" think
extruded polystyrene and 1/2" gypsum board
|
6.5 |
6.5 |
6.5 |
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- 2" x 2" wood furring
(24" o.c.) with 1 1/2" thick cellular polyisocynanurate,
gas permeable face, and 1/2" gypsum board.
|
7.6 |
7.6 |
7.6 |
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Notes:
1. For intergrally insulated masonry. Series-Parallel
calculations are the method mandated by the U.S.
Department of Energy, most State Energy Codes (including
Minnesota and Wisconsin), the American Society of Heating,
Refrigeration and Air-conditioning Engineers ASHRAE
STANDARD 90.1 and the National Concrete Masonry
Association (NCMA). The only acceptable alternative is
testing according to the ASTM C-236 "Guarded Hot-Box" by
an independent accredited laboratory at specific densities
& properties.
2. Concrete thermal resistivity values (R per inch) are
from NCMA TEK 6-2A, resistivity high range (protected from
moisture). Perlite loose fill thermal resistivity (R per
inch) is taken from NCMA TEK 6-2A = 3.13; polystyrene
loose fill is assumed the same as it is processed form
various unknown scrap sources. Foam thermal resistivity
value R = 4.46 (average from literature of three
companies.)
3. R-value include inside air film (.68) and outside air
film (.17) coefficient totaling R = .85.
4. All R-values are steady-state values to be used in the
"ENVSTD", "COMcheck" and "MNcheck" computer programs which
allow for mass of walls; for other applications, a mass
adjustment is allowed according to the 1989 Model Energy
Code, Table No, 502.1.2c. |
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