|
Aluminium or vinyl siding on a frame wall. Sprayed from the exterior |
|
Wall components |
Through frame |
Through cavity |
|
RSI |
R |
RSI |
R |
|
|
Metric |
Imperial |
Metric |
Imperial |
|
1 |
Outside air film |
0.03 |
0.17 |
0.03 |
0.17 |
|
2 |
Aluminium or vinyl siding |
0.11 |
0.61 |
0.11 |
0.61 |
|
3 |
Furring 38mm / ( 1 1/2" ) |
/ |
/ |
/ |
/ |
|
4 |
Air space |
/ |
/ |
0.17 |
0.97 |
|
5 |
Sprayed polyurethane foam HEATLOK 0240 |
1.05 |
6 |
1.05 |
6 |
|
6 |
Sheating 13mm ( 7/16" ) |
0.11 |
0.62 |
0.11 |
0.62 |
|
7 |
Wood stud 90mm ( 3 1/2" ) |
0.77 |
4.38 |
/ |
/ |
|
8 |
Insulation batts 89mm ( 3 1/2" ) |
/ |
/ |
2.11 |
12 |
|
9 |
Vapour retarder |
/ |
/ |
/ |
/ |
|
10 |
Gypsum drywall 13mm ( 1/2" ) |
0.08 |
0.45 |
0.08 |
0.45 |
|
11 |
Inside air film |
0.12 |
0.68 |
0.12 |
0.68 |
|
System performance - Metric / Imperial |
|
Total RSI / R value of section |
2.27 |
12.91 |
3.78 |
21.5 |
|
" U " value of section |
0.441 |
0.077 |
0.265 |
0.047 |
|
Apply framing correction * |
20% |
80% |
|
0.088 |
0.015 |
0.212 |
0.038 |
|
|
|
Average U value for entire wall |
0,0888+0,212= 0,300
|
0,015+0,038= 0,053
|
|
Average RSI / R value for entire wall |
(1/U) 3,33
|
18.86 |
|
|
|
* Correction based upon 2 - wood storeys frame buldings studs and plates of which 20% is wall area, |
|
double studs at doors, windows, corners, posts, partitions, tie-ins, lintels, |
|
and area between studs is 80% of the wall area. |
|
|
