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aemeijers

wrote:
You need deflectors on inside corners like that. They will divert the
gush sideways right into the gutters. Any decent gutter outfit should have
installed them.

But these are outside corners (of the main roof) not inside corners.

If you have water escaping at outside corners where the roof
doesn't funnel the water then the spillage is coming from turbulence.
When the water tries to flow around that outside corner it is impeded
just enough to overflow.

Install the elevated sidewall and it may contain the water long enough
to maintain the desired flow. It may also create a scenario where the
inside of the gutter overflows and damages the roof?
Nobody else said it, so I will- bigger gutters/downspouts, and maybe a
downspout right at the problem corners? If the water comes off the roof
in a larger volume than the gutter and downspouts can handle, it has to
go somewhere. I have a shallow roof, and if one of the spouts gets even
slightly blocked, it shoots over the full gutter in heavy rain. Bigger
downspouts, and maybe a couple more of them, are on my 'one of these
days' list. No idea why previous owner didn't change them when he
replaced gutters themselves, which are shiny and slick rollform, and
very easy to keep clean. (I use a leaf blower on them- takes maybe five
minutes for entire house.)

I wonder if you could make a water feature out of it- a horizontal pipe
to really speed it up, and shoot it into the neighbor's yard? :^/

--
aem sends...