Tank Stand Guide
When a roof is to have a water tank installed, this should be indicated to us
at the design stage. When a non-standard tank is used, the size, type and
position should be clearly indicated to us.
The following diagram & table give a guide as to how a tank stand should
be installed and the timber sizes required.
| Sizes for support members |
| Total tank capacity |
Min. member sizes mm |
Max truss span for fink configuration
m |
Max bay size for other configurations
m |
| a & c |
b |
| Detail A - Not more than
300Litres, supported on four trussed rafters. |
47x72 |
2/35x97 or 1/47x120 |
6.50 |
2.20 |
| 47x72 |
2/35x120 or 1/47x145 |
9.00 |
2.80 |
| 47x72 |
2/35x145
|
12.00 |
3.80 |
| Detail B - Not more than
230Litres, supported on three trussed rafters. |
47x72 |
1/47x97 |
6.50 |
2.20 |
| 47x72 |
2/35x97 or 1/47x120 |
9.00 |
2.80 |
| 47x72 |
2/35x120 or 1/47x145 |
12.00 |
3.80 |
| Timber grade must not be less than C16 |
