63 mm diameter downpipes.
How many downpipes for roof area australia.
Quantity and placement of downpipes.
Using clause e1 table 5 see figure 2 at a roof pitch of 45 for this example.
Sizing downpipes downpipes are sized for the areas that discharge into them.
This is because larger roofs require bigger volumes of water to be diverted away from them during periods of rainfall.
The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.
And the provision of appropriate overflow devices.
Design of eaves gutters box gutters downpipes to the australian national plumbing code as nzs 3500 3.
Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards.
Offsets are available to fit either a 450mm or 600mm eaves overhang.
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.
To calculate the minimum number of downpipes divide the roof catchment area by the allowable maximum catchment per downpipe.
Select 100 x 50 rectangular downpipe.
A house in chicago has a roof whose actual drainage area is 1 000 square feet.
To use the gdo calculator enter information about the location roof design and types of overflow measures.
The program will calculate the most suitable circular and rectangular downpipe sizes.
And downpipe outlets channel water from the gutter to the downpipe.
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.
Figure 1 an example of a roof with a total plan area of 98 m.
Shingle roofs typically have a life span of 15 30 years.
Usually the size for the largest collection area on the roof is used to size downpipes throughout.
From figure 3 5 a in as nzs 3500 3 the maximum catchment per downpipe is 47m 2.
The answers for downpipe size are in mm.
How many downpipes do you need.
Particular reference should be made to the correct sizing of gutter.
Downpipe straps attach the downpipe to the wall downpipe shoes 135 and elbows 90 help water flow to a specific area.
Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet.
Determine minimum number of downpipes.
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.
Complete your spouting project with a range of downpipe accessories.
