Why does the chimney leak when the shingles are new?
New shingles do not fix a failed flashing joint. Water that gets behind the metal runs down the masonry and into the house without ever touching the new shingles.
A roof can be re-covered from end to end and still leak at the chimney if the base or counterflashing is left in poor condition. The water comes in at the joint, and the new shingles sit above it dry.
This is why the flashing is checked before any re-roof and why a chimney leak is treated as a joint problem first, not a shingle problem.
Can I seal the chimney joint with caulk?
Sealant can hold a small gap for a while, but it dries, cracks and pulls away in heat and rain. It is not a repair for failed counterflashing.
A bead of sealant can look tidy from the ground and still leave water running behind the metal. The technician checks for this when the joint is opened up, since sealant over a failed piece hides the problem.
Where a temporary seal is the sensible step, the estimate says so and says when the joint should be revisited. Ask the crew to state the plan plainly.
What moves the price of a chimney flashing repair?
The height of the chimney, how much flashing and masonry is involved, the roof's pitch, and the access to the roofline all move the price. The price is explained and approved before work starts.
A chimney that stands low on a simple roof is a shorter job than a tall chimney on a steep, complex roof. Damaged masonry that needs repointing or a rebuilt crown adds separate work and separate time.
Access on a rural lot can matter, since the ladder and the materials have to reach the eave. No figure is given here. The on-site inspection and the written estimate are the only real numbers for your house.
Is it safe to work on a chimney?
Working on a chimney from a steep roof is a fall hazard, and loose masonry can fall. Cracked or loose brick should be assessed by someone who can work from a safe position.
A ladder leaned against the masonry can crack the chimney, and a crew that has to lean over the chimney top can lose its footing. Those are good reasons to leave the chimney work to people who set up for it.
Stay clear of the area below the chimney while work is done, since loose mortar and brick can come down.
Does chimney damage count for insurance?
It depends on your policy and the cause of the damage, and your insurer decides. Photograph the chimney, the flashing and any staining 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. A written estimate before committing is also part of that advice.
The insurance claims guide describes the order of steps after a storm, and it is worth reading before the first call.