| COEFFICIENTS OF HEAT TRANSFER (U) FOR VARIOUS WALLS |
| BASIC WALL CONSTRUCTION* |
Interior finish |
|
½ plaster on |
|
|
¾ furring with |
| Plain Wall No Plaster |
Wall Direct |
3/8" Plaster Board |
1/2" Rigid Insulation |
| CONCRETE MASONRY (Cores not filled) |
8” Sand and gravel or limestone
8” Cinder
8” Expanded slag, clay or shale
12” Sand and gravel or limestone
12”Cinder
12” Expanded slag, clay or shale |
0.53
0.37
0.33
0.49
0.35
0.32 |
0.49
0.35
0.32
0.45
0.33
0.31 |
0.31
0.25
0.23
0.30
0.24
0.23 |
0.22
0.19
0.18
0.22
0.18
0.18 |
CONCRETE MASONRY (Cores filled with insulation**) |
8” Sand gravel or limestone
8” Cinder
8” Expanded slag, clay or shale
12” Sand and gravel or limestone
12” Cinder
12” Expanded slag, clay or shale |
0.39
0.20
0.17
0.34
0.20
0.15 |
0.37
0.19
0.17
0.32
0.19
0.14 |
0.26
0.16
0.14
0.24
0.15
0.12 |
0.19
0.13
0.12
0.18
0.13
0.11 |
CAVITY WALLS (With 2” or larger cavity. Cavity not filled with insulation) |
10” Wall of two 4” sand and gravel or limestone units.
10” Wall of two 4” cinder, expanded slag, clay or shale units.
10” Wall of 4” face brick and 4” sand and gravel or limestone units.
10” Wall of 4” face brick and 4” cinder expanded slag, clay or shale units.
14” Wall of 4” face brick and 8” sand and gravel or limestone units.
14” Wall of 4” face brick and 8” cinder expanded slag, clay or shale units.
14” Wall of 4” and 8” sand and gravel limestone units.
14” Wall of 4” and 8” cinder, expanded slag, clay or shale units. |
0.34
0.26
0.38
0.33
0.33
0.26
0.30
0.22
|
0.33
0.24
0.36
0.31
0.31
0.25
0.28
0.21
|
0.24
0.19
0.25
0.23
0.23
0.19
0.21
0.17
|
0.18
0.15
0.19
0.18
0.18
0.16
0.17
0.14
|
4” FACE BRICK PLUS |
4” Sand and gravel or limestone unit
4” Cinder expanded slag, clay or shale unit.
4” Common brick.
8” Sand and gravel or limestone unit.
8” Cinder expanded slag, clay or shale unit.
8” Common brick.
1” Wood sheathing, paper, 2” x 4” studs, lath and plaster. |
0.53
0.44
0.50
0.44
0.31
0.36
_
|
0.49
0.42
0.46
0.41
0.30
0.34
0.27
|
0.31
0.28
0.30
0.28
0.22
0.24
0.27
|
0.23
0.21
0.22
0.21
0.17
0.19
0.20
|
4” COMMON BRICK PLUS |
4” Sand and gravel or limestone unit
4” Cinder, expanded slag, clay or shale unit
8” Sand and gravel or limestone unit
8” Cinder, expanded slag, clay or shale unit.
8” Common brick
1” Wood sheathing, paper, 2” x 4” studs, wood lath and plaster. |
0.45
0.38
0.37
0.28
0.31
_
|
0.42
0.36
0.35
0.27
0.30
0.25
|
0.28
0.26
0.25
0.20
0.22
0.25
|
0.21
0.19
0.19
0.16
0.17
0.19
|
WOOD FRAME |
Wood siding, 1” wood sheathing, 2” x 4” studs, wood lath and plaster |
_ |
0.25 |
0.24 |
0.19 |