On Wed, 16 Mar 2011 16:54:06 -0700 (PDT), Kyle
wrote:

Now that the weather has gotten a bit more civilized in my area of the
U.S., I went on the roof to do a few seasonal fixes, among which was
tightening the pins/spikes that hold the gutter in place.

I noticed that the gutter on the front of the house (about 50'/15m
long) has standing water in the center 20'/5m or so (about 3/4"/1cm at
deepest point). Anyone have any reasonable solutions as to how to
raise the center so that water drains and doesn't lay there?

I've seen in old discussions here advice about pulling the gutter and
remounting it, but I don't see how that's feasible. We're talking
about moving a gutter less than the diameter of the nail/pin that
holds it in place, and it's not like one can just move the nail/pin to
the left or right, yes?

Putting the downspout at the low point is right out, as the low spot
is right over the front door.

I haven't seen anyone post results of filling the low space with some
sort of lightweight solid that would raise the "floor" of the gutter
to make it drain.

Any thoughts?

Yeah. I've got a low spot too. Maybe 3 feet long, that holds maybe
1/4 inch of water until it evaporates.
That's on a about a 35 foot run on the front of the house.
I think it was caused by ice weighing the gutter down and bending it.
Probably have a warm spot there because it's where the biggest icicles
form.
Not a gutter expert, but I've hung some.
Since a gutter is a square form and has a rolled front edge they are
pretty stiff.
When I put 25 footers on my garage I noticed no sag when I leveled
them.
Attached the high end and low end with the prescribed drop, then did
the other hangers. Used a dial level to check and the angle stayed
the same without me forcing the gutter up or down.
What this tells me is the low spot on the house is because the gutter
is bent.
So I'm not sure rehanging that same gutter would work.
If it's bent it's bent.
I've thought about bending it back up, using a jack, but it's not bad
enough to worry about. Not sure how that would work out.
Might screw up the hangers.
A low spot tends to collect debris and can form a dam, but I just get
up there at least every other year and clean the gutters out.

Bottom line - live with it or hang a new gutter.
Doubt drilling a hole will work if you get any debris in the gutter.
It'll just get plugged up.

--Vic