If water overflows from the gutter and there's no evidence of a blockage, the problem may be caused by a broken or misaligned gutter bracket which is allowing the section of gutter to subside.
If water pools in the gutter, this is also a sign of bad alignment. Replace any brocken brackets you find, and reposition others as necessery to restore the gutter alignment.
Start
by removing the guttering from the brackets that require realigning. If you can't compress the gutter to release
it from the clips, insert a screwdriver blade and lever them apart
The
bracket at the top end of the gutter run should be fitted as high on the facia as possible. The bracket at the
opposite end should be 25mm lower than this for each 5 metre of gutter run. Tie a length of string between the the
two, and refit the remaining brackets, so they align with it.
If
you only need to alter a bracket position slightly, move it to one side, still aligned with the string, so you don't
have to work over the old screw holes. Use new screws.
Refit the guttering, sliding it into the brackets and snapping the clips back into position.
