Box Gutter Overflow Detail

Holes through the splash guard and the gutter.

Box gutter overflow detail.

The outside detail is similar to detail 10 5d except that conductor heads and downspouts are not required. You can find these precut gutter splash guards about 3 in brown and white aluminum at a home center but you could easily make your own out of aluminum or sheet metal and spray paint them to match your gutters. Outlets box gutter outlets must discharge through either a rainhead or sump. Box gutters box gutters under the code come with complete overflow designs.

A range of gutter components and rainwater goods are available to complete the system which includes. The total flow is used to size the sump and overflow. In my last article i discussed the emergence of the issue of provision for overflow in external eaves gutters or more specifically the lack of provision for overflow. On the roof side overflow scuppers can be detailed similar to detail 10 5d.

The outlet of the box gutter may be blocked by debris or the box gutter outlet simply cannot discharge the water fast enough. Layout box gutters must. Peter coll provides a timely update regarding the provision for overflow and box gutter compliance. The hail storms in melbourne and whyalla have once again highlighted the problems of box gutters particularly where they are undersized or do not have an overflow mechanism.

The most fail safe are the ones with no ends. If the box gutter has no overflow provisions this causes a waterfall over the sides of the box gutter typically running down the walls. Any box gutter relying on a pipe or a slot for overflow can get blocked. Support the entire weight of the gutter and sumps when full of water as well as a trafficable load at any point in the gutter and sumps.

Gutter replaced overflow inserted to reduce likelihood of damage but look at the quality of the workmanship with the overuse of silicone. Square section pre coated steel downpipes. The detail shows an alternate method of constructing either type of scupper. Internal and external corners stop ends t sections sumps overflows and weirs.

So in this situation consider a larger than required opening especially if the roof is likely to catch leaves or balls. Downpipes available in lengths up to 6m. This has become a big issue in the past few months particularly in victoria and is going to be a new section in the upcoming. The side with the maximum flow is used to size the box gutter.

This free online box gutter calculator will calculate the size of box gutters and sumps with a side overflow in accordance with the australian plumbing code as nzs 3500 3 2003 part 3 storm water drainage. The scupper is locked and soldered to the closure flange on all sides. Overflow box gutters must have independent overflow provision discharging to the atmosphere. As an alternative the top of the rainhead may be installed so that it is no higher than 50 per cent of the flow depth of the box gutter consistent with saa hb39 installation code for metal roof and wall cladding section 5 clause 5 7 3 and figure 5 7 3 to prevent internal flooding or damage to the building or contents see figure 2.