Twenty two squares of roof, and all of the trouble sat in about thirty linear feet of it. That is the usual shape of a leak call on a design led remodel: two skylight curbs and one shed dormer valley, with the shingle field doing exactly what it was specified to do. Which is why the roofing contractors sumner wa homeowners call after a second wet winter are almost always there for a detail rather than for a roof. The argument here is simple. A pared back roofline does not leak because the design was wrong, it leaks because it pushes water into fewer and harder junctions, and correcting those junctions costs a small fraction of what touching the rest of the roof would.
Minimal Rooflines Trade Overhang For Exposure
An eighteen inch overhang throws water clear of the wall and clear of the head of anything set into the slope. Cut that back to three inches for a crisp fascia line, and the same water now runs across the top of the skylight curb instead of past it. Add a shed dormer and you have drawn a valley, which is a funnel by definition. None of this is a mistake in the drawing. It is a trade, and the trade is paid in flashing. The failures actually worth fearing on a roof are the structural ones, and This Old House reported in August 2026 that a sagging or bulging roofline seen from inside the attic signals failure in the rafters, trusses or decking, with a proper repair running $5,000 to $20,000 or more. A detail leak caught in its second season almost never gets there.
Job after job, the same two spots turn up on the punch list, and neither of them is the field of the roof. Water is patient. It finds the head of the curb where the step flashing stops short, and it finds the point where a dormer valley dumps onto a lower run of shingles. In practice this typically means the repair gets measured in feet, not in squares.
Comparing Skylight Curbs Against Valley Details
The two failures look alike from the ceiling and behave nothing alike up on the slope. A skylight leak is usually a curb and head flashing problem, meaning water works in behind the counterflashing at the top edge and then runs down the sides of the curb, so the fix is local, repeatable, and mostly a matter of sequencing metal under the course above it. A valley leak is a volume problem. Two planes are dumping into one channel, and if the underlayment stops short or the shingles were woven where the design called for an open metal valley, the water has somewhere to go for the whole length of the run. Curbs fail at a point. Valleys fail along a line, which is why the valley is usually the more expensive of the two.
Put rough numbers on that Sumner remodel and the comparison stops being abstract. Say the two skylight curbs are re-flashed at $650 each, the eighteen foot dormer valley is opened, papered and rebuilt as an open metal valley at $38 a foot, and the crew adds $220 for matched shingles plus $300 for staging on a second story dormer. Call it $2,504 all in. Honestly, closer to $3,000 once someone opens that valley and finds two feet of soft decking, which on a leak that has run two wet seasons is the normal discovery rather than the surprise. Against that, tearing off and replacing all twenty two squares at an illustrative $650 a square lands near $14,300, and most of what it replaced never let a drop through.
Before anyone gets a check, run the license number through Verify a Contractor, the free lookup Washington’s Department of Labor and Industries publishes for exactly this purpose. It returns the bond, the insurance and the registration status in about ten seconds. And stay off the roof yourself while you are waiting: never climb a wet or moss covered slope to hunt for the source, because the fall is the part of this that genuinely hurts you. Most of the evidence reads better from the attic side anyway, in a dry hour, with a flashlight and a little patience.
Detail Repairs Fix Leaks Without Touching The Roof
A scoped repair is the honest answer for a roof whose field is eight years old and perfectly sound. Open the detail, correct the metal, replace whatever the water softened, and reinstall the finish so it matches the plane the elevation was drawn for. That last part matters more on a minimal roof than on a deep eaved one, because there is no overhang shadow to hide a lumpy patch. Ask for the flashing profile in writing before the work starts.
There is a version of this where the leak really is the roof, and a good contractor will say so rather than sell you three details. So that is the question to put to whichever roofing contractors sumner wa homeowners have shortlisted: is the assembly failing or is the junction failing, and what does the attic actually show. A clean roofline is worth keeping. It only asks that you spend on the four or five places where it gathers water, and that you spend there early, while the repair is still measured in feet.
