April Lutheran
Glazing U-Factor (BTU/h-ft2 -°F)
| Description | Lower | Upper |
|
Single Glazing - including frame and sash |
0.71 | 1.06 |
|
Standard Double Glazing - including frame and sash |
0.54 | 0.70 |
|
Performance Double Glazing (low-e) - including frame and sash |
0.36 | 0.53 |
|
Triple Glazing - including frame and sash |
0.18 | 0.35 |
|
Triple Glazing (argon filled cavity) - including frame and sash |
0.07 | 0.18 |
Glazing SHGC
| Description | Lower | Upper |
| Clear Single Glazing | 0.71 | 0.9 |
| Clear Double Glazing | 0.41 | 0.7 |
| Reflective Coated Glazing | 0.21 | 0.4 |
| Glazing with Internal Blinds | 0 | 0.2 |
Surface Reflectance
| Description | Lower | Upper |
|
Mirror Finish - highly reflective 0.9 1 |
0.9 | 1 |
|
Light coloured walls - reflective |
0.6 | 0.9 |
| Medium coloured walls | 0.4 | 0.6 |
| Dark coloured walls - low reflectivity | 0.1 | 0.4 |
| Black - very low reflectivity | 0 | 0.1 |
Leakage (cfm/ft2 )
| Description | Lower | Upper |
|
Leaky building |
0.56 | and above |
|
Normal practice |
0.28 | 0.55 |
| Best practice | 0.06 | 0.27 |
| Extremely tight building | 0 | 0.05 |
Roof Thermal Resistance R-value (ft2 -h-°F/BTU)
| Description | Lower | Upper |
|
Uninsulated and single skin roofs |
1.14 | 5.00 |
|
Poorly insulated (approx. 50mm/2in insulation) |
5.01 | 9.00 |
|
Insulated (approx. 100mm/4in insulation) |
9.01 | 22.00 |
|
Well insulated (approx. 150mm/6in insulation) |
22.01 | and above |
Floor Thermal Resistance R-value (ft2 -h-°F/BTU)
| Description | Lower | Upper |
|
Uninsulated |
1.14 | 1.41 |
|
Poorly insulated (approx. 50mm/2in insulation) |
1.42 | 4.00 |
|
Insulated (approx. 100mm/4in insulation) |
4.01 | 23.00 |
|
Well insulated (approx. 150mm/6in insulation) |
23.01 | and above |
Walls Thermal Resistance R-value (ft2 -h-°F/BTU)
| Description | Lower | Upper |
|
Uninsulated |
1.1 | 5.00 |
|
Poorly insulated (approx. 50mm/2in insulation) |
5.01 | 11.00 |
|
Insulated (approx. 100mm/4in insulation) |
11.01 | 16.00 |
|
Well insulated (approx. 150mm/6in insulation) |
16.01 | and above |
Comments