Box Gutter Overflow Weir

Fixings specification engineered for gutter substrate type.

Box gutter overflow weir.

In a situation where an existing box gutter needs to be renewed and it will be difficult for the roofing practitioner to comply with as nzs 3500 3the practitioner or owner may apply to the vba for a modification. Bespoke moulded stop end c w weir overflow mwseof before hot air welding of the stop end the liner should be pinned and fixed. A range of gutter components and rainwater goods are available to complete the system which includes. Rainheads incorporating an overflow weir or sumps with side or high capacity overflow devices.

Weir with end contraction contracted weir weir without end contraction suppressed weir classification based on shape of opening rectangular weir. Square section pre coated steel downpipes. Once hot air welding is complete the angle is blank pinned and fixed. Downpipes available in lengths up to 6m.

Horizontal inlet piping is provided with an underflow baffle while vertical inlet piping is provided with an overflow or combination overflow underflow baffle. The top edge of weir may be sharp crested or narrow. To ensure that adequate overflow provisions are made and any surcharge is accommodated the overflow weir of any rainhead is to be 25 mm below the sole of the gutter discharging to the rainhead or alternatively rainheads are to have appropriately sized and positioned overflow provision see figure 5 3 1 a. 2 your gutters aren t positioned correctly.

Due to differences in the freeboard requirements in this instance the deepest box gutter is required and used in the program. Square or round ppc aluminium downpipes. Trial box gutter width. The pitch and tilt of your gutters make all of the difference.

Height of overflow weir above the bottom of the box gutter loc from fig i6a. Note it is possible in a wide box gutter for the depth to be shallower than for box gutters with a free outfall. To ensure that adequate overflow provision is made and any surcharge is accommodated the overflow weir of the rainhead is to be 25mm below the sole of the gutter and be fully open above the weir at the front of the rainhead see figure 1. Pipe connection or free spilling.

The pitch of gutter heading towards a downspout can also cause overflow if it s too steep. There are 9 overflow slots per metre. It is a standard shape of weir. Flow can enter a weir box in one of two ways.

Pipe connections can be horizontal or vertical into the weir box. Types of weirs based on effect of the sides on the emerging nappe. Distance from the overflow slots to the top of the back of the gutter hf is 10mm.