Gutter Cross Sectional Area

The following tables are intended to assist designers in determining the size of eaves gutters required in accordance with as nzs 3500 3 2003.

Gutter cross sectional area.

Area a at 38 m. All stramit rainwater products confirm with or are equivalent to as2179 1. 1 500 2mm in 1m minimum downpipe. Clause 3 5 4 in the australian plumbing code dictates that the effective gutter cross sectional area shall be taken as the area beneath a line not less than 10 mm below the overflow e g front bead gutter back or bottom of overflow slots.

Effective cross sectional area. The gutter area shown in the program is the effective cross sectional area. Catchment area per downpipe based on the above flow capacity is given in table 3 1j. Horizontal supports shall be supported at each end and at intervals not exceeding 10 feet.

The eaves gutter selected is quad spouting with an effective cross sectional area of 6125mm 2 installed with a slope of 1 500. Circular 80mm rectangular min. Cross sectional area of 2835mm smallest dimension at least 50mm. In this case the cross sectional area of a section of gutter is approximately 7 000 8 000 mm so a 125 70 mm gutter 8 750 mm will meet.

79 litres min minimum recommended fall. This is an external gutter so using clause e1 figure 15 plot 38 40 m plan area on the vertical axis. Cross sectional area 8435mm. Effective cross sectional area with 10mm free board.

Effective cross sectional area mm2 of eaves gutter gradients of 1 500 and steeper. Catchment area per downpipe based on the above flow capacity is given in table 3 1g. 7500mm with 15mm free board flow capacity. Determine downpipe size from table 3 3 in as nzs 3500 3 the minimum size downpipes compatible with spouting of 6125mm 2 cross sectional area installed at a 1 500 gradient are 90mm diameter round or 100 x 50.

Cross sectional area of 4125mm smallest dimension at least 50mm. Then read off the gutter size for the roof pitch of 45 see figure 3. Cross sectional line drawing. See table 2 for allowable conductor cross sectional areas.

Box gutter 125mm conceals the sheet ends at the eave line and looks great with profiled longrun sheeting or tile roofing internal and external brackets are available in this profile and it is suitable for use with fascia 185 fascia 155 and fascia 135. 112 litres min minimum recommended fall. Sizing of minimum downpipe size relates only to the cross sectional area of the chosen gutter. Sum of the cross sectional area of all conductors contained in the wireway at any cross section shall not exceed 20 of the interior cross sectional area of the wireway.