Aluminum paint is often used to recoat when galvanized or painted finish deteriorates, as it is fairly waterproof. Maintenance required - esp. after winter. Felt 30-40 yrs. Tar and gravel 10-15 yrs. Asbestos shingle 30-40 yrs.
Shingles get brittle when walked on.
Maintain every 5 years. Composition shingles 12-16 yrs. Fireplace 20-30 yrs. Brick veneer life Joints should be pointed every 5 to 10 years. Unless a porous grade stone like limestone, which will deteriorate.