Minimum dimensions for internal gutters shown in figure 52 or requires dimensions to be calculated from e1 as1 whichever is greater.
Gutter dimensions nz.
The only mention of a required minimum slope for internal gutters in the compliance documents is in e2 as1 covering butyl rubber lined gutters where it requires a fall of 1 100.
727 litres min or 616 litres min minimum recommended fall.
Effective cross sectional area.
Gutter style gutters are typically k style and half round styles though custom profile are available.
New zealand building code clause e1 figure 15.
1 500 2mm in 1m.
Box gutter 125 box gutter 175 box gutter 300 quadline gutter squareline colonial quad gutter half round gutter box gutter 115 quarter round gutter fascia 135 fascia 155 fascia 185 round downpipe 55x75mm downpipe 95x130mm downpipe.
K style sizes will typically range from 5 to 6.
Gutters will be the same size for all the roof so use the largest plan area to work out the appropriate size gutter.
Effective cross sectional area with 15mm free board.
Large sized gutter for commercial and industrial applications.
A fall of 1 60 provides even better drainage.
This is an external gutter so using clause e1 figure 15 plot 38 40 m plan area on the vertical axis.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
1 500 2mm in 1m minimum downpipe.
The largest plan area is area a at 38 m.
Then use the chart below to see what size gutter you need.
5 inch 5 520 square feet.
All dimensions given are nominal.
6 inch 7 960 square feet.
Cross sectional area of 4125mm smallest dimension at least 50mm.
Marley spouting is nz designed and manufactured for nz conditions.
33 550mm or 29 400mm g 600mm flow capacity.
7500mm with 15mm free board flow capacity.
They don t corrode or rust and are ideal for coastal areas with salt laden air.
Box gutter 125 box gutter 175 box gutter 300 quadline gutter squareline colonial quad gutter half round gutter box gutter 115 quarter round gutter fascia 135 fascia 155 fascia 185 round downpipe 55x75mm downpipe 95x130mm downpipe.
Appendix 1 gives rainfall intensities around new zealand and figure 16 provides a graph from which to determine internal gutter sizes based on a rainfall intensity of 100 mm hour.
