Check plumbing vent boots and roof vents if water is entering from that area to cause the leaking roof.
Roof joint leak addition.
Melting ice that drips onto a home addition also complicates the matter when you have a leak.
During the winter months in some.
Begin by removing the shingles down to the wood sheathing and slip a strip of adhesive ice and water barrier available where roofing repair products are sold under the soffit main roof joint.
2plumbing vent boots and roof vents.
Look for cracks in the base of flexible rubber flashing or broken seams in metal varieties of vent pipe flashing.
When a new porch is the leaking addition.
In the case of a lean to roof over an addition the existing rafters will have to be cut away to accommodate the addition and the shed roof will require support where.
Another technique for avoiding leaks involves laying rows of shingles over tar paper to prevent damage to the sheathing.
When it would rain the water would run down chimney and dormers under second layer and dump into old gutters.
The rubber gasket that surrounds the vent pipe could be rotted.
A well ventilated attic should help prevent leaks on your roof in the winter.
Depending on how the roofs join you may have to cut a slot to work it in far enough.