Grand Timber garage doors offer three section options. Sections provide insulation values as well as the structural base for receiving the wood or metal overlay. Our use of ployurethane insulated steel sections provides our doors with industry leading insulation values, making them ideal of the energy conscious homeowner. The characteristics of the three section options are shown below:
| |
 |
 |
 |
| Insulation R-Value |
5.4 |
12.8 |
17.5 |
| Sectional Material |
Wood-hardboard |
Steel |
Steel |
| Insulation Material |
Polystyrene |
Polyurethane |
Polyurethane |
| Sectional Thickness |
1-3/8 inch |
1-5/8 inch |
2.0 inch |
| Warranty |
1 year |
2 years |
2 years |
| Sectional Thermal Break |
No |
Yes |
Yes |
| Between Sectional Seal |
No |
Yes |
Yes |
| Air Infiltration (15 mph) |
.47 |
.11 |
.08 |
Fuel Cost Comparison
The section samples shown have been laboratory tested for both R-value and air infiltration. Heat loss through these sections has been measured by the variables noted below:
- Garage Door size = 16’ wide x 8’ tall (128 square feet)
- Natural Gas Heating Fuel Cost at $13.92 per 1000 cubic feet
- Climate Data for Denver and Kansas City
| Denver |
| Total Heat Lost (BTU/hr) |
1,526 |
434 |
316 |
| Total Annual Fuel Cost |
$233 |
$66 |
$48 |
| |
| Kansas City |
| Total Heat Lost (BTU/hr) |
1,445 |
326 |
237 |
| Total Annual Fuel Cost |
$174 |
$50 |
$36 |