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Ask a pro: Leaky eavestrough
My eavestrough leaks, between the aluminum fascia and the eavestrough itself. I installed it according to the instructions for slope and fastening. What did I do wrong and what can I do to fix it? -Ross Johnson, Saskatoon
My guess is that you have one of two problems. Water could be leaking over the back of the eavestrough–the part that sits against the fascia–because the eavestrough is overflowing. The solution: make sure the downspouts are clear and sized properly.
More likely, however, your water flows off the roof shingles and then down between the eavestrough and the fascia. Make sure that the eavestrough is mounted high enough on the fascia so that it sits just below where the shingles will dump off the water. The shingles should be overhanging the roof deck by at least 1″. An easy fix for this problem, if you don’t already have it, is to install a drip edge along the eaves, tucked under the shingles. The drip edge ensures a continuous path for the water and it helps to support the shingles, so that they don’t break or droop at their edges.