Had news eavestroughs put up awhile ago, and the installer seems to
have done a bad job. In a heavy rain they overflow at the ends
opposite the downspout, and there's standing water in them after the
rain. I'm getting the contractors to come back and rehang them, but in
the meantime I wonder if I need an additional downspout. The roof of
my house, in side profile, is shaped like this:
The problem eavestroughs run along the long, flat, back portion of the
house, one on each side. I assume that by rehanging them at a correct
slope I'll solve most of the problem.
But in trying to figure this all out, I've also realized that I have
about 70 feet of gutter (two 27-foot sides plus a 17-foot back) all
draining into a single downspout at one corner of the house.
I'm thinking of asking them to put another downspout on the opposite
back corner of the house. In the archives for this group, I see that
one downspout per 40 feet is standard, but that it also depends on
things like roof pitch and precipitation. I'm in Toronto, so there's a
lot of precipitation, and it's a flat roof (except for the small
steeply-pitched section you can see above, which drains onto the flat
roof and then off to the sides).
The reason I'm asking the group is that these contractors have already
made a hash of the job three times (initial installation plus two
half-hearted repair attempts), and we're now demanding pretty strongly
that they do the job right, but of course no longer really trust them
to tell us what the right way is. If it's clear that an additional
downspout should have been installed we'll demand it. If it seems
optional or isn't clearly necessary, I might back off on that demand
and settle for a correct slope.
Thanks for any help.