Key takeaway
A homeowner-friendly breakdown of the roofing components and conditions most likely to cause water intrusion.
Damaged or missing shingles
Shingles that are missing, cracked, creased, lifted, or deteriorated may allow water to reach the underlayment and decking.
Flashing failures
Flashing directs water away from chimneys, walls, valleys, skylights, and roof penetrations. Loose, corroded, poorly installed, or separated flashing is a common leak source.
Cracked pipe boots
Rubber or plastic pipe boots can crack, split, loosen, or deteriorate from age and weather exposure.
Valley problems
Valleys carry large volumes of water. Installation problems, debris, damage, or deterioration can create leaks in these high-flow areas.
Skylights and chimneys
Leaks around skylights and chimneys may involve flashing, sealants, counterflashing, masonry, condensation, or the unit itself.
Ventilation and condensation
Not every moisture problem is a roof leak. Poor attic ventilation and condensation can create damp insulation, staining, mold, or moisture on decking.
Storm damage
Wind, hail, falling limbs, and flying debris can damage roofing components suddenly or weaken them enough to fail later.
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