The bottom base flashing is made of a single piece of metal extending 3 to 6 inches down over the shingles that already have been installed and 12 inches some say less up the bottom face of the chimney.
Flashing around chimney in attic.
If you see white stains on the brick inside the home you might have an issue with leaks.
4 chimney flashing causes leaks the flashing is what keeps water from going into the place where the brick structure comes through the roof or otherwise comes close to the roof there s a fairly large gap between the bricks and the roof and water will pour through that hole if it s not sealed up.
Walking on the roof helps the inspector feel how much flex is in the roof sheathing particularly in key areas such as valleys around chimneys and around roof penetrations.
Often ponding water will rust a hole in the simple flashing found on most chimneys.
The attic allows you to see prior or current leak activity.
The material is usually aluminum or galvanized steel and depending on the type of roof you have is most likely in the valleys around the chimney and even around dormer windows or skylights.
The other way is through the attic space.
8 cut a piece of flashing to measure the circumference of the flue plus 6 inches.
This is an area that often tells the story the best.
Base flashing bottom before the base flashing is installed the roof is shingled up to the bottom of the chimney.
According to the federal emergency management agency fema improper roof flashing could lead to wood rot and even deck collapse.
Weather and oxidization are the most common culprits for flashing deterioration but it is possible that flashing can just simply come loose.
Flashing prevents water from leaking down the chimney into the attic.
If you see water entry in the attic on the uphill side of the chimney we know a chimney cricket is needed so water is not ponding in this area.
Bend a piece of cap flashing to fit around the top corner of the chimney and add the cap flashing across the back of the chimney.
Pound the flashing into the grooves and fasten with the drive in expanding anchors.
Code requires a chimney have a cricket if it is thirty inches or wider.
Apply a thick bead of the high temperature caulk around the joint where the flue enters the attic.
How to repair leaky chimney flashing.