Look for cracked housing and broken seams in the vent.
Flashing boots on rhe roof loose.
You might not notice it for years but eventually rot will destroy sheathing and framing.
Flashing refers to the thinmetal sheet that covers transitions point in your roof.
Base flashing is one length of flashing that is bent along the length to match the pitch of the roof.
Roof flashing is sheet metal installed at any breaks joints or edges on your roof to prevent leaks.
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One common issue with roofing maintenance is the replacement or repair of what is called roof flashing or simple flashing.
Damaged or improperly installed roof flashing especially around the chimney or dormer is one of the most common causes of roof leaks.
Step flashing should always be used where the roof deck meets a sidewall.
Again check the rubber boot the base and the nails.
Roof vent pipes from plumbing or exhaust vents penetrate the roof and are usually sealed using a collar style flashing made out of a flexible material like epdm rubber or flexible pvc.
They are designed to keep water from entering the building by creating a water tight seal around the pipe.
This is worst when there is a door or a window below and water can seep behind the trim.
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Most of the time roof leaks occur because the sealing around vent pipes has failed the metal flashing on the chimney has deteriorated or the connections between roof sections have eroded.
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Most flashing is composed of aluminum or galvanized metal.
Kick out flashing is critical where a roof edge meets a sidewall.
However over time they will begin to tear and gap.
According to the federal emergency management agency fema improper roof flashing could lead to wood rot and even deck collapse.
Like plumbing vents any vent or exhaust flue in your roof is a place where leaks are more likely to develop.
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Commonly called a pipe boot or vent pipe flashing the flexible seal hugs the vent pipe and seals it from water.
Base flashing is installed over underlayment but under siding and shingles so you may not be able to see it from the ground.