An aging roof
A roof rarely fails on a single day. It gets close over several years, and then one long wet season finds the weakest point. On the Puget Sound the aging runs on water rather than sun: a covering that never quite dries wears out from the edges and the shaded slopes inward, and it announces itself, to anyone who knows where to look.
- 1 Ridge caps. The first pieces to lift, and the ones the weather gets underneath.
- 2 The field. Moss on the damp slopes holds water where the covering wants to dry.
- 3 Valleys. Needles mat where two slopes drain as one, and stay wet for months.
- 4 Flashing. The chimney, and where an addition meets the original roof.
- 5 The vent boot. Rubber perishes quietly under a canopy that never lets it dry out.
- 6 Eaves. The last part of the roof to dry, and the first to go soft.
The signs, roughly in order
The moss line comes first: growth establishing along the north slopes and shaded sections, a sign the surface is staying wet longer than it should. Granules follow: collecting in gutters as the mineral armour leaves, fastest under moss and along the eaves.
The small rubber boots around plumbing vents crack in their second decade regardless of climate, and a cracked boot is often a roof’s first actual leak. Then the edges soften, ridge caps, the thinnest, most exposed pieces on the roof, begin working loose, and the covering starts reading a different age on each slope.
The useful question near the end is not “can it be patched” but “what does this year’s decision cost versus next year’s.” Replacing early forfeits a little remaining life; replacing late buys deck repair and interior work on top of the same roof. On plat-era streets where every covering went on the same season, the neighbors’ roofs are data: when the street starts turning over, an evaluation of your own is due.
The dry window is short, and it books up
A finding of “this covering has about a season left” lands differently here than it does in a place where roofs go on year round. The reliable stretch of dry weather on the Sound is roughly July through September, and that is when tear-offs get scheduled, which means the calendar fills from spring onward. A roof recognized as finished in November is generally looking at the following summer, and the months in between are the ones that decide whether the deck underneath is still sound when the crew finally opens it.
So the practical move is to have the conversation a year early rather than at the point of failure. Somewhere in the second half of a covering’s life, an evaluation that dates it and grades the slopes separately turns a question into a date on a calendar. Waiting for the ceiling to mark hands the decision to the weather, and the weather here is not in a hurry.