Often water runs to openings in the vapor barrier such as at ceiling light fixtures.
Roof vent leak into wall.
A roof leak at the edge of a dormer can allow a lot of water to enter your home.
Dormer leaks can be caused from a number of issues.
If you have no eaves or you have the deep fascia gutter then the perimeter gutter will overflow in heavy rain and get into the wall cavity.
Remove debris make sure your roof valleys are clear of debris re shingle valleys valleys may need to be reshingled with new ice and water shield put in place.
A roof that leaks around a vent pipe is a common cause of small water stains on a ceiling or water leaking into a home.
The leaking may first be seen in the attic but if you don t catch it right away you may see water coming into the house dripping on the floor.
Fix a leaky roof vent pipe with a oatey rubber gasket.
Sun exposure and heat especially during the summer can cause the rubber boot to crack creating the space for water to leak in.
Years of sun weathering etc.
Plumbing vent boots and roof vents check plumbing vent boots and roof vents if water is entering from that area to cause the leaking roof.
Some roof leaks are tough to locate.
First thing to do is to have it checked immediately.
Sometimes the water shows up at a ceiling spot distant from the leak.
Look for cracks in the base of flexible rubber flashing or broken seams in metal varieties of vent pipe flashing.
The rubber gasket that surrounds the vent pipe could be rotted.
The flashings are installed to keep water from coming down the slope of your roof hitting the vent and running down the outside of the duct into the house.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic.
Roof vents are made from different materials.
When the roof vent is leaking the actual cause must be identified first.
Normally if you have good eaves you will not get water into the house even if the gutters themselves are overflowing.
Worn out flashing or missing sealant can also cause roof leaks around dormers.
Cause the rubber to crack and it will start leaking.
Rotten or missing trim or siding can allow water to leak behind flashing and into your roof.