Additional bars may be required if roof vents are specified or in high snow or windload area’s.
| 1500mm | 1750mm | 2000mm | 2250mm | 2500mm | 2750mm | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Width | Length | Width | Length | Width | Length | Width | Length | Width | Length | Width | Length | |
| 1500mm | 0 | 0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| 1750mm | 0 | 0 | 2 | 2 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| 2000mm | 0 | 0 | 1 | 1 | 2 | 2 | N/A | N/A | N/A | N/A | N/A | N/A |
| 2250mm | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 2 | N/A | N/A | N/A | N/A |
| 2500mm | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | N/A | N/A |
| 2750mm | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
| 3000mm | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 3250mm | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 3500mm | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 3750mm | 0 | 1 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 1 |
| 4000mm | 0 | 1 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| 4250mm | 0 | 1 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| 4500mm | 0 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| 4750mm | 0 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 2 |
| 5000mm | 0 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 2 |
| 5250mm | 0 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 |
| 5500mm | 0 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 |
| 5750mm | 0 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 |
| 6000mm | 0 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 |
| 6250mm | 0 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 3 |
| 6500mm | 0 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| 6750mm | 0 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| 7000mm | 0 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| 7250mm | 0 | 5 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| 7500mm | 0 | 5 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| 7750mm | N/A | N/A | 1 | 5 | 1 | 5 | 1 | 5 | 1 | 5 | 1 | 5 |
| 8000mm | N/A | N/A | N/A | N/A | 1 | 5 | 1 | 5 | 1 | 5 | 1 | 5 |
| 8250mm | N/A | N/A | N/A | N/A | N/A | N/A | 1 | 5 | 1 | 5 | 1 | 5 |
| 8500mm | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 1 | 5 | 1 | 5 |