Dos and don'ts for box gutters to minimise maintenance and repair

Box gutters are one of our most common items of roof work here in Sydney.
And box gutters are the most mis-understood element on a roof.
We have a design code in Australia for box gutters - but hardly anyone seem to follow the design code. And this makes for a multitude of problems with box gutters.
A combination of bad maintenance and bad design always cause a lot of damage to a property that is stuck with box gutters.
In this video, we explore box gutters that we often find in all suburbs of Sydney and look at the dos and don'ts of box gutters - that can get you out of trouble.
Many homeowners have to live with box gutters.
So, it pays to know as much as you can about them....
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Video on simplified box gutter design is : • Box gutter design for ...

[@ChristianWagner888]

How about: "Don't design the house with a box gutter!"? Much less trouble and lower risk.

[@jetnavigator]

Agree. They seem to be beyond the capabilities of many tradesmen.

[@ChristianWagner888]

Australia seems to be one of only a few countries that require a sump, whereas in most countries they just connect the downspout directly. What exactly is the function and advantage of having a sump? What can happen, if there is no sump?

[@RoofRepairsSydney]

The sump allows maximum flow in the downpipe by the 'head ' of water that the sump generates. Much like pulling the plug in your kitchen sink that is full of water..

[@ChristianWagner888]

@@RoofRepairsSydney thanks, that makes sense. I guess in the Philippines we make up for the somewhat decreased flow by using multiple 3 to 4 inch downpipes on each really deep (more than 20 cm) gutter. Also, internal box gutters are not as common here, making the whole system less risky.
It's good to know that I might be able to increase overall flow by just adding a sump. I think architects here dislike sumps, because they mess up the clean lines of their design.

[@jetnavigator]

Site Inspections!!

[@TadiwaMatemera]

Hallow

[@jsmith1899]

Typical Australian building and construction. Some of the worst on earth.