To help protect the shingle and reflect the suns rays. The UV light is very damaging to the the shingle.
There is not a set number of years, but if your roof has multiple leaks, the shingles are asphalt and show signs of curling or buckling, your gutters are full of the granules which cover the asphalt shingles, or you want to give your home a new appearance, then it would be time to check into it.
Asphalt shingles typically last between and 15 and 30 years. It varies depending on the quality of your asphalt shingles
form_title= Asphalt Shingles form_header= Put a new roof on your home with asphalt shingles. What color shingles do you need? *= _ [50] What size shingles do you need?*= _ [50] Are you replacing a whole roof?*= () Yes () No How old is the roof?*= _ [50]
26 shingles in a bundle of three tab asphalt shingles
or fiberglass ? Depends where you live, determines what shingles to use.
everything burns.
Depends on the shingle. Is it a 25 year or fifty year. Asphalt or fiberglass?
Yes.
All shingles fade after time
Perhaps, but not guaranteed. Tile is generally much heavier than asphalt or "composition" shingles. If you're concerned, have a roofing contractor to evaluate your roof.
An inexperienced handyman.
Most asphalt shingles have a strict nailing schedule so the shingles are secure but don't leak. I have included a link to an illustration for an asphalt shingle nailing schedule below.