How Many Downpipes For Roof Area Australia

The program will calculate the most suitable circular and rectangular downpipe sizes.

How many downpipes for roof area australia.

Complete your spouting project with a range of downpipe accessories. Figure 1 an example of a roof with a total plan area of 98 m. Design of eaves gutters box gutters downpipes to the australian national plumbing code as nzs 3500 3. Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the roofing material calculator.

Min number of downpipes roof catchment area. 63 mm diameter downpipes. Offsets are available to fit either a 450mm or 600mm eaves overhang. How many downpipes do you need.

Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet. Divide the main roof into catchments of this size and any left over area can be entered again to find a down pipe size for this smaller area. And downpipe outlets channel water from the gutter to the downpipe. Select 100 x 50 rectangular downpipe.

The most common roofing materials used in the united states include shingles membrane roofing and ceramic tile all of which have different life spans. From figure 3 5 a in as nzs 3500 3 the maximum catchment per downpipe is 47m 2. Determine minimum number of downpipes. And the provision of appropriate overflow devices.

Calculators for designing eaves gutters box gutters downpipes pipes and open channels etc to australian standards. Shingle roofs typically have a life span of 15 30 years. Using clause e1 table 5 see figure 2 at a roof pitch of 45 for this example. This is because larger roofs require bigger volumes of water to be diverted away from them during periods of rainfall.

Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet. Quantity and placement of downpipes. The answers for downpipe size are in mm.

The gutters downpipes and overflow gdo calculator assists in developing a better understanding of the ncc volume two part 3 5 3 gutters and downpipes acceptable construction practice acp provisions. Sizing downpipes downpipes are sized for the areas that discharge into them. Downpipe straps attach the downpipe to the wall downpipe shoes 135 and elbows 90 help water flow to a specific area. To calculate the minimum number of downpipes divide the roof catchment area by the allowable maximum catchment per downpipe.

The number of downpipes you need will depend on the size of your roof and your chosen style of guttering. Particular reference should be made to the correct sizing of gutter.