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Question DetailsAsked on 6/11/2018

should a seamless gutter hold water after it rains

I saw a water reflection on my stucco in 2 seamless gutters after it rained. Is this normal?

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1 Answer


In theory not, but most gutters have slight low or flat areas which can retain a bit of water - or if there is roof granule and leak debris in the gutter it can dam up a section. If it only lasts a day or so after the rain ends I would not worry. And of course you can always go up on the roof or use a long handle or 2x2 stick or such with a hand mirror (largish type you use in bathroom to look at the back of your head and such) taped on to look and see how deep the water is. A slight accumulation - I would not worry. If an actual "pool" of say 1/2" deep or more then that will reduce the flow capacity of the gutter and promote debris accumulation at that point, and (at least if a new installation) I would ask for correction.

In existing (not newly installed) ones if the sag or low point is more than about 1/4 to 1/3 the depth of the gutter is where I would seriously start thinking of correcting it - commonly a matter of just removing a couple of hanger screws and relocating them further up the fascia board. Easy DIY IF the hanger screws show on the outside of the gutter - a bit tougher if used hanger spikes. If the hangers are cantilever hangers which are attached to the fascia board and then the gutter is dropped/snapped in place, like with most segmentall and some seamless vinyl gutters, tougher to do because you have to pop the gutter out of the hanger for quite a distance each side of the low spot (typically totally remove from there to one free end) to get at the hanger mounting screws which are normally concealed behind the gutters. Probably take a gutter company minimum service charge of around $60-125 to correct ones with exposed fasteners, maybe twice that amount if concealed hanger fastener type.

Most gutters are installed quite near level - just low slope - so they "look" right - so slight dips and troughs occur during the installation and from "tin canning" of the gutters - slight bowing and bending due to expansion, which can cause shallow puddles in the gutters. If they are installed in the best way from a technical standpoint, with a 1-2% slope, so they self-clean the best and have maximum flow capacity, they also look very distinctly sloped (or arched up in the center if flowing to downspouts at both ends), so that is usually not done. That is the practice principally in areas with significant winter icing issues or frequent very heavy tropical type rainfalls, to try to promote more rapid removal of the water.

Answered 2 years ago by LCD

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