There are some signs that may indicate that your roof is ready to be replaced.
The roof shingles may have curling or buckling.
There could be broken or missing shingles.
Dark areas on a shingled roof or excessive granules in the gutters may indicate that there has been significant granule loss.
“Open” valleys or valleys with cracked shingles can be a potential leak area.
If here is roof cement or tar around the base of the chimney, around the base of pipes, or along walls than you are lacking adequate flashing material.
If you can see daylight through the roof boards in the attic that means that the roof has spaced boards for decking and should have plywood decking installed.
Excessive moss, lichen, or mildew can hold moisture which can shorten the life of your roof. Lichen will feed off the organic matter in the granules.
If your roof is 20 years old or more than it should be replaced. The underlayment used that long ago probably will not be adequate as there have been significant changes in the types that are used now.
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