Fall is Roof Leak Season In Seattle
Here is in Seattle we have lots of nice trees, especially evergreens. With a name like evergreen you would think that falling leaves is not a problem but evergreens are one of the worst contributors to debris build up problems on roofs.
Evergreens drop needles continously in the fall. This year is one of the worst, because the amount they drop is related to how dry the summer season has been; the drier, the more needles.
Evergreen needles are rarely blown off the roof but rather build in valleys and under tree overhangs. Water build up behind the needles can cause roof leaks. Even if you do not see a roof leak, the water will flow under the shingles and onto the roof deck. Over time this will delaminate the plywood roof deck creating soft spots and eventually failure. For proper roof care make certain your roof is clear of debris build up.