Common Sources of Attic Water Intrusion
Water can enter an attic from several sources. Some problems are easy to
spot, while others stay hidden until moisture has spread through
insulation and framing. Knowing these common causes can help you identify
attic moisture early.
Roof leaks
Damaged shingles, worn seals, or cracked flashing can allow
rainwater into the attic
Ice dams
Ice buildup along the roof edge can trap melting snow and push water
beneath shingles
Poor ventilation
Limited airflow can trap humidity and cause moisture to build up in
insulation
Clogged gutters
Blocked gutters can cause water to back up beneath the roofline and
enter the attic
Plumbing failures
Leaking pipes near the attic can release water onto insulation and
surrounding materials
HVAC condensation
HVAC condensation can drip onto nearby insulation, wood framing, and
other materials