I recently did an eavestrough diagnosis, cleaning and
repair. Stephen C. had a problem with water running over the top of his
eaves and onto the garden near the house. Excess water shouldn't be
allowed near the house wall, as it might leak into the basement. It
could cause slippery ice on the ground in the winter (unauthorized
skating rink!) .
He said the problems started when the roofers put new
shingles on the house. Ahaaa!! I checked, and found that the
aluminum sheet in the valley (low spot where two angles of roof come
together) projected too far over the eavestrough. There was only a 1"
gap for the water to get into the trough. If it was a heavy rain, the
water would be going too quickly, and have too much volume, to get a
chance to get into the small gap. Since water is lazy, and takes the
path of least resistance, like some humans do, it chose to go over the
top. I cut back the excess sheet metal with snips, and then banged it down a bit
more, with a more rounded profile, with a hammer. I pushed some excessive
overlap shingles downward, so that they sloped better into the trough.
The gap is now more like 4" wide. I checked the
angle of roof to the top of eaves, and it seemed ok. If the
eavestrough was too low compared to the roof, the water might again run
over the top.
In an extreme case, like at David R.'s house, the eaves
were clean, but the roof was very wide, meaning a large volume of water,
and the eaves were too low. I had a water dam made by an aluminum
contractor with a folding machine. I screwed the sections in on top of
the trough, and they looked gorgeous. No more overflow problem for
David. One stipulation is to never allow a contractor to put a ladder
up against the dam, as the dam will get deformed/bent, and will never
look the same unless that section is replaced. Go up on the ladder in a
different spot. The colours match gorgeously.
Aarre