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Posted by MNRebecca on October 8, 2007, 1:07 pm
Tried to walk the dog between storms yesterday and got caught in a
downpour which yielded unexpected results. I saw something I might
otherwise never have known about. When the rain comes down really
hard, water backs up out of a downspout elbow, shooting into the air
like a fountain (to land in a vulnerable, leak-inducing area) instead
of continuing along the long, extended horizontal downspout track* to
drain away from the house/foundation. Before I look into wider
downspouts and elbows, I'd like to try sealing thoroughly. What will
work better, duct tape or gutter sealant?
*Downspout runs the length of the house, about 40 feet (with one
additional 90 degree turn besides the elbow) before spilling onto the
lawn to run down a hill. This was necessary as the neighbor's
property, just a few feet away, slopes down towards my house. No room
to effectively release water without navigating the length of the
house.
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Posted by RicodJour on October 8, 2007, 1:19 pm
> Tried to walk the dog between storms yesterday and got caught in a
> downpour which yielded unexpected results. I saw something I might
> otherwise never have known about. When the rain comes down really
> hard, water backs up out of a downspout elbow, shooting into the air
> like a fountain (to land in a vulnerable, leak-inducing area) instead
> of continuing along the long, extended horizontal downspout track* to
> drain away from the house/foundation. Before I look into wider
> downspouts and elbows, I'd like to try sealing thoroughly. What will
> work better, duct tape or gutter sealant?
Downspout components are generally not sealed. You have to clear the
blockage and there won't be a need to worry about a sealant.
> *Downspout runs the length of the house, about 40 feet (with one
> additional 90 degree turn besides the elbow) before spilling onto the
> lawn to run down a hill. This was necessary as the neighbor's
> property, just a few feet away, slopes down towards my house. No room
> to effectively release water without navigating the length of the
> house.
That is a horrible setup. If you have to dig a drywell to handle the
rain water, then that is what should be done.
If your gutters clog frequently - with a 40' run and a 90 degree bend
I'm sure they do - you should definitely have something like Leafguard
gutters so they won't get clogged with leaves.
R
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Posted by DT on October 8, 2007, 7:37 pm
webbrl@morris.umn.edu says...
>
>Tried to walk the dog between storms yesterday and got caught in a
>downpour which yielded unexpected results. I saw something I might
>otherwise never have known about. When the rain comes down really
>hard, water backs up out of a downspout elbow, shooting into the air
>like a fountain (to land in a vulnerable, leak-inducing area) instead
>of continuing along the long, extended horizontal downspout track* to
>drain away from the house/foundation. Before I look into wider
>downspouts and elbows, I'd like to try sealing thoroughly. What will
>work better, duct tape or gutter sealant?
>
>*Downspout runs the length of the house, about 40 feet (with one
>additional 90 degree turn besides the elbow) before spilling onto the
>lawn to run down a hill. This was necessary as the neighbor's
>property, just a few feet away, slopes down towards my house. No room
>to effectively release water without navigating the length of the
>house.
Larger downspouts will sure help. If you have the standard 2x3 size, you can go
to the 3x4 size. If the 40' horizontal run is not real visible, replace it with
pvc pipe. I have a similar situation, I use 4" pvc to run 36' across the front
of the house, but it is under the porch so it doesn't show.
--
Dennis
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Posted by Bobk207 on October 9, 2007, 2:37 am
> Tried to walk the dog between storms yesterday and got caught in a
> downpour which yielded unexpected results. I saw something I might
> otherwise never have known about. When the rain comes down really
> hard, water backs up out of a downspout elbow, shooting into the air
> like a fountain (to land in a vulnerable, leak-inducing area) instead
> of continuing along the long, extended horizontal downspout track* to
> drain away from the house/foundation. Before I look into wider
> downspouts and elbows, I'd like to try sealing thoroughly. What will
> work better, duct tape or gutter sealant?
>
> *Downspout runs the length of the house, about 40 feet (with one
> additional 90 degree turn besides the elbow) before spilling onto the
> lawn to run down a hill. This was necessary as the neighbor's
> property, just a few feet away, slopes down towards my house. No room
> to effectively release water without navigating the length of the
> house.
R-
You don't have a sealing problem, you have a "blockage problem".
Forty feet of "downspout", really drain line, and two elbows are
probably a little excessive...so the water is backing up &
pressurizing the joint that you see spraying water. You could (when
its dry) seal the joint wiht aluminum tape but that's only fixing the
symptom. You need to make sure your the drainline portion of your run
is free of obstruction & when clean, it is able to handle the
necessary flow.
If cleaning (bust open the joint & blast the drainline clean with a
hose) fixes the problem, you're done. If not consider replacing the
drainline portion of the "downspout" system with a 3" or 4" plastic
drainline. Dump the real downspout into the new drainline. Ideally
you'll need ~10" of drop for the drainline....if you have less, this
might be the cause of the backup.
If you go with the drainline fix, use a sweep T fitting with a
cleanout to make maint easier.
cheers
Bob
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Posted by Dave on October 9, 2007, 8:57 am
> Tried to walk the dog between storms yesterday and got caught in a
> downpour which yielded unexpected results. I saw something I might
> otherwise never have known about. When the rain comes down really
> hard, water backs up out of a downspout elbow, shooting into the air
So the downspout is effectively point up, not down, in this region?
> like a fountain (to land in a vulnerable, leak-inducing area) instead
> of continuing along the long, extended horizontal downspout track* to
> drain away from the house/foundation. Before I look into wider
> downspouts and elbows, I'd like to try sealing thoroughly. What will
> work better, duct tape or gutter sealant?
>
What type of roof do you have?
> *Downspout runs the length of the house, about 40 feet (with one
> additional 90 degree turn besides the elbow) before spilling onto the
> lawn to run down a hill. This was necessary as the neighbor's
> property, just a few feet away, slopes down towards my house. No room
> to effectively release water without navigating the length of the
> house.
>
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