Over time, the materials used for the roof are exposed to high temperatures causing damage to the shingles from the expansion and contraction by changes in temperature from morning to night and in changing seasons. This expansion and contraction in the roof material is the cause of damage in the majority of roofs, which vary depending on the sun, rain and the winds.  This gives most roofs only a life of  between 20 to 30 years. This means a roof should be reviewed or inspected at least once a year. The roof life depends on the area and location of the property which means that some roofs approaching 15 years old are ready to have the material replaced.

From the ground, you can get an idea of how the roof is doing by a visual inspection with binoculars, looking at falling waters. You have to also take into account the loss of granules from roof shingles, and know how fast the roof is losing these granules or if the roof is already a bit smooth. One of the best ways to appreciate in detail the status in which the roof is in is by climbing to the roof and walking on it carefully in order to get a closer look. The true indicators of the deterioration of the roof are when it rises and lowering, dimples, doing deformations, loose or missing shingles and loss of granules.

Tar patches/marks or sections of different colors indicate the shingles last repair and tile cement used for patching may only last a few years. Check these areas in the interior of the attic. Many things could be said about the roof so that it seems. In general, a good indicator of the willingness of the roof is straight lines. If the shingles and is set well, should be straight lines all the way up and along the roof.

This indicates that the roof is well built, and the result is going to last longer. Sections of different colors indicate the shingles last repair and tile cement used for patching may only last a few years. Check these areas in the interior of the attic. Still tell a lot about a roof by how it looks. Normally, a good indicator of a well laid roof is straight lines. If shingles were set and see also: properly, they should form straight lines all the way up and across the roof. This trend to indicate that the roof is well built and as a result, will last longer.

Look for any unevenness or sagging in the roof (check inside the attic, too). If the ridge or whole sections of the roof sag, there could be insufficient framing support.

CAUTION: Always be careful when you use a ladder to climb to a roof.

The Shingles deteriorate easily when it is hot or cold; therefore, when walking on them you
should be very careful to avoid any damage.