Asphalt roof shingles don't last forever. In fact, this type of shingles has a warranty that varies from 10 to 30 years when exposed to the elements. Nevertheless, shingles which have constant exposure to the sun, will fade in colour and deteriorate at a faster rate as opposed to those that receive less sunlight.
Over time, shingles begin to curl, cup, and twist along the edges. As the old shingles continue to wither under weather conditions, the tabs begin to shrink and cause a wider space between them. Rain water and moisture tend build up behind the shingles and eventually cause decay to roof plywood.
In colder climates, moisture buildup under a leaky asphalt shingle roof (underlayment) speeds up the rotting process of roof membrane. Therefore it is essential to change the shingles before it becomes too costly to fix.
Roof experts may say to replace asphalt shingles at the first sign of wear, but others will contend to wait till the shingles are lifting up, shrinking ... and breaking apart before any major work is done to the roof.
However, the best way to find out is to do a visual check of each row/course of shingles and inspect them thoroughly. Since the roof is the security and lifeline of the structure, immediate attention is required when the shingles start breaking apart as light pressure is applied.
Look at the shingles and check for wave like and ripple formation along the rows, inspect the tabs for adhesive failure and dull spots on the surfaces as well as broken tabs or loose shingles. Loose grit on the surface, around roof jacks, chimney and step flashing is an indication of shingle decay. Be cautious of the loose grit which feels like sand marbles when stepped on as one may slip and fall upon contact.
On an intersecting roof, check along the valleys for gaps, cracked tar joints, rusted out metal valleys and granule formation in the eaves trough. Inspect along the ridge for loose roofing nails and ridge caps. Look behind the chimney saddle for any signs of possible shingle wear and leaks. With all these indicators, one can determine the severity of the problem and when to replace the shingles.
As replacing the shingles is a job that requires planning and proper
installation of new shingles to prevent leaks as well as having a professional
look upon completion, it is important that the contractor or home renovator
follow the provided instructions on the shingle package to the utmost.
When to re-shingle your house roof
Asphalt roof shingles don't last forever. In fact, this type of
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