Any advice about roof runoff which shoots
Problem occurs at two corners of a steeply gabled
roof over a deck. Rainfall collects in such volume
that at the corners it shoots a foot or more horizontally
before falling 18 feet to the deck, where at one corner it
damages the stained railings, and at the other has
encouraged rot in several siding boards below the deck.
We added eavestroughs and a downspout elsewhere,
curing a similar problem, but do not know what to do
about the corners, where damage now is worse after
an unusually rainy summer.
Florida here......the thingies are arched and generally about 3 or 4
inches higher than roof surface. That's just a guestimate, but I'm sure
they aren't a foot high. Rained here last night and water coming off
the side of the roof was no more than about an inch.
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? :^/
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