Heat and ultraviolet rays cause roofing materials to age, especially on
surfaces facing west or south.
Water that gets underneath shingles or other roofing materials can cause the
decking (base) and rafters to rot, threatening a home's structural
integrity. Moisture entering a house can damage walls, ceilings, insulation
and electrical systems.
High winds can lift shingles' edges and force water and debris underneath.
Snow & Ice
Melting snow often refreezes at a roof's overhang where the surface is
cooler, forming an ice dam. This blocks proper drainage into the gutter and
allows water to back up under roofing materials and seep into the interior.
Moisture in poorly ventilated attics can lead to condensation that promotes
decay of roof decking and rafters.
Trees & Leaves
Tree branches touching or falling onto a roof can damage the roofing
materials. Leaves on the roof and in gutters retain moisture and could cause
rot and poor gutter drainage.
Missing or Torn Shingles
When shingles are missing or torn off, a roof's structure and your home
become vulnerable to water because the remaining shingles can be easily
ripped or blown off.
When shingles are old and worn out, they curl, split and allow water to leak
through. Damage and deterioration can only get worse with time.
Good, tight-fitting flashing around chimneys, vents, skylights and wall/roof
junctions is essential to creating a secure, watertight roofing system.
Flashings should be checked as part of your spring and fall roof inspection
and gutter cleaning.
Source: National Roofing Contractors Association
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