Why does my roof leak at a joint when the shingles look fine?
Flashing fails at joints and seals before the shingles wear out, and water finds the gap while the shingles still look sound. The leak usually shows inside first, on a ceiling or a wall.
Metal expands and contracts with heat, and sealant dries, cracks and pulls away over time. Those movements open a small gap at the joint, and water runs through it along the metal and under the shingles at the edge.
Because the water travels, the stain may be several feet from the actual gap. The attic check above the stain traces the path back to the joint that needs work.
Can flashing be patched with sealant?
Sealant can hold a small gap for a while, but it cracks and pulls away in sun and heat. It is a short-term measure, and repeated sealant on the same joint usually means the flashing needs replacing.
A patch can look neat from the ground and still leave water running under the metal. The technician checks for this, since sealant placed over a failed piece hides the problem rather than solving it.
Where a patch is the sensible choice for a short time, the estimate will say so and say when it should be revisited. Ask the crew to state the plan plainly.
What moves the price of a flashing repair?
The number of joints involved, how much metal needs replacing, the height and pitch of the roof, and the access on a rural lot all move the price. The price is explained and approved before work starts.
A single vent boot is a short job. A valley that runs the length of an addition, or a joint that needs the shingles lifted across a wide area, takes more time and more care to avoid breaking the surrounding material.
Access matters too. A joint that can be reached from a ladder on firm ground is different from one that needs fall protection on a steep roof. No figure is given here, and the on-site look and the written estimate are the real numbers.
Should I climb up to check the flashing myself?
Not on a steep or wet roof. Flashing can be checked from the attic and from the ground with binoculars, and the roof walk belongs to someone who can do it safely.
A valley or a vent is easy to miss from below, and a step in the roof can look fine until it is seen up close. The attic is a safer place to look for water staining along the framing and around the pipes.
If you do need to look from the roof, do it only in dry weather on a low roof with a stable ladder and a second person nearby.
Does storm damage to flashing count for insurance?
Coverage depends on your policy and the cause of the damage, and your insurer decides. Wind or hail damage to flashing may be treated differently from wear and age.
Photograph the flashing, the joint and any stains inside before anything is changed. The N.C. Department of Justice advises contacting your insurance company early, since some insurers need an adjuster to approve work before it begins.
The insurance claims guide describes the order of steps after a storm, and the written estimate helps the adjuster see what the repair involves.