Loose gutters gutters that were improperly installed or gutters filled with debris may cause water to back up into the roof and leak through an exterior overhang.
Roof joint leak addition.
During the winter months in some.
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.
Depending on how the roofs join you may have to cut a slot to work it in far enough.
When it would rain the water would run down chimney and dormers under second layer and dump into old gutters.
Leak where addition meets house had similar situation as todd second roof on top of original on old section the flashing was under first layer of old roof.
Another technique for avoiding leaks involves laying rows of shingles over tar paper to prevent damage to the sheathing.
A well ventilated attic should help prevent leaks on your roof in the winter.
When a new porch is the leaking addition.
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.
Attaching below the ridge.
2plumbing vent boots and roof vents.
The rubber gasket that surrounds the vent pipe could be rotted.