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Question DetailsAsked on 10/30/2016

On a new gutter installation. The lengthwise end of the gutter should not be shorter than the roof? Right?

I had all new gutters installed. In four areas they are 1" to1.5" lengthwise beyond the edge of the roof. In three areas the gutters are .5" to1" shorter lengthwise than the edge of the roof. I have an issue with this. As it may cause icicles to form. Not to mention there is an obvious mismatch. What is right and what is incorrect?

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1 Answer


I install gutters typically 4" past the end of the roofing - not the fascia board, but the roofing - because water running down the roof commonly runs off the corner at an angle because the roof slope at the corner of the roof is actually outward some, not straight down the roofline, because the corners commonly droop a bit. It can also blow off at an angle in wind. This gutter extension therefore picks up the runoff off the corner of the shingles or whatever type roofing you have.

To do a neat job, the downspout adapter commonly goes roughly in line with the corner of the house itself - right in front of the corner trim usually if the downspout is going to come off perpendicular to the gutter. This allows the downspout to be angled back to the corner trip from the doqwnspout adapter, then run down the corner trim with the mnounting brackets mounted to the corner trim, then angled back out at the bottom to the discharge point - or straight down sometimes if going into an underground discharge pipe.

If it is going to come off parallel to the gutter - so off the "end" of the roof, two ways to do it - like above with the bottom kick-out turning it 90 degrees to the side to discharge off the "end" of the house. Other way is to mount the adapter slightly past the end of the house, so the downspout angles back toward the house and meets up with a downspout mounted on the corner trim, but on the end of the house face, not the "long" or guttered side face. Then down the corner and kick out away from the house to drainaage away from the house as appropriate.

With this arrangement - downspout at the corner of the house, but gutter extending beyond the corner of the roofing, this means on a normal peaked roof you have a gutter extension of a foot to three (depending on gable end eave overhang) beyond the downspout adapter - mounted as normal, with an end blank on the end of the gutter. Looks like this typically - this one they ran the downspout off the end of the house to tie into what looks like a porch roof downspout - sort of a goofy deal there. But illustrates how you can run the downspout off the "gutter face" of the corner or the "end wall face" - and shows the extension past the downspout adapter.

And yes all should be the same extension to or past the roof corner on a given house unless there is some oddity preventing it. Granted, uneven extensions or lengths are common, because different people onthe crew might be working front and back of the house - or they just measure the gutter lengths sloppy - but that is no excuse for a sloppy appearance.

BTW - the short runs will not "cause icicles to form" - the icicles will hang free from the roof corner and be a possible safety hazard rather than bottom out in the gutter though, if that is what you meant.

Answered 4 years ago by LCD

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