Cistern Roof Data:
Roof dimensions (ft) | Area (m^2) | |
20 | 12 | 22.3 |
mm of rain | Volume (L)* | |
1.0 | 16.7 | |
25.4 | 425.0 | |
125 | 2091.4 | |
275 | 4601.1 | |
1370 | 22921.6 | |
*volume correction for evaporation (15-25%)
Material List for Cistern Roof | |||
Item | # | $ | extended |
Dek Blocks | 6 | 7.49 | 44.94 |
2x6x20 | 4 | 11.9 | 47.6 |
2x6x16 | 16 | 9.52 | 152.32 |
2x6x12 | 6 | 5 | 30 |
2x4x12 | 10 | 2.97 | 29.7 |
4x4x12 cedar | 6 | 33 | 198 |
screws | 2 | 29.99 | 59.98 |
metal roof | 240 | 1.2 | 288 |
hdwr for roof | 1 | 100 | 100 |
paint | 1 | 50 | 50 |
gutter, etc | 1 | 100 | 100 |
hoses and emitters | |||
Labour (m/hrs) | 32 | 20 | 640 |
SUBTOTAL | 1588.22 | ||
HST | 190.59 | ||
TOTAL | 1778.81 | ||
Total cost ($) | 1778.81 |
litres/yr | 11091 |
cost/litre ($) 1yr | 0.1604 |
cost/litre ($) 5yrs | 0.0321 |
