Originally Posted By: dhadler
This post was automatically imported from our archived forum.
This is probably the most difficult and controversial subjects. You ask 10 people and you’ll probably get 10 different answers. Hopefully they will be in the same ball park though.
Ages 1-5 just look new, lay nice and flat, edges of shingles crisp and totally covered with granules. If they have just been done nails will still be shiny and usually some plastic strips still hanging around from the tar strips. there's always some loose nails laying here and there that havn't been washed into the eves from the weather. Spacing between shingles ~1/4"
Age 6-10 Evidence of slight granule loss on the bottom edges of the shingles. Spacing between shingles usually increases to about 5/16 "
Starting to develop an unevenness, not perfectly flat like when new.
Age 11-15 Increased granule loss on edges of shingles and corners will start lifting and curling slightly. Spacing may increase to about 3/8"
Age 16-20 As above but much more noticeable, You can usually tell as you drive up to the house. The felt part is usually fairly visible as the granules are probably missing from the edges. Spacing has probably increased to the 1/2" mark.
This is for the average 20 year weight 3 tab shingle. BUT... Ventilation and local weather can adversely affect the life and aging process. Dark colors don't fair as well as lighter ones either. The dark ones tend to cook much quicker and that can take a few years off their life, in hot sunny climates.
Hope it helps some ![icon_biggrin.gif](upload://iKNGSw3qcRIEmXySa8gItY6Gczg.gif)
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Medicine Hat, Alberta CANADA