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.
Box gutter overflow detail.
Square section pre coated steel downpipes.
Outlets box gutter outlets must discharge through either a rainhead or sump.
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.
If the box gutter has no overflow provisions this causes a waterfall over the sides of the box gutter typically running down the walls.
The detail shows an alternate method of constructing either type of scupper.
On the roof side overflow scuppers can be detailed similar to detail 10 5d.
The scupper is locked and soldered to the closure flange on all sides.
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.
Internal and external corners stop ends t sections sumps overflows and weirs.
The outlet of the box gutter may be blocked by debris or the box gutter outlet simply cannot discharge the water fast enough.
The outside detail is similar to detail 10 5d except that conductor heads and downspouts are not required.
Layout box gutters must.
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.
Drill rivet holes for the gutter splash guard.
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.
Peter coll provides a timely update regarding the provision for overflow and box gutter compliance.
The total flow is used to size the sump and overflow.
It sounds like you have an overflow situation.
The side with the maximum flow is used to size the box gutter.
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.
A range of gutter components and rainwater goods are available to complete the system which includes.
Gutter replaced overflow inserted to reduce likelihood of damage but look at the quality of the workmanship with the overuse of silicone.
Any box gutter relying on a pipe or a slot for overflow can get blocked.
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.
Downpipes available in lengths up to 6m.
Square or round ppc aluminium downpipes.
So in this situation consider a larger than required opening especially if the roof is likely to catch leaves or balls.
Overflow box gutters must have independent overflow provision discharging to the atmosphere.
