[pwinnski]

Texas resident here. There's a guy who's been riding a Segway around my neighborhood looking for weather damage from recent storms, and his pitch to homeowners is that they don't need to replace the entire roof, just the section where things are--or will soon be--leaking.

It's probably more efficient to replace the entire roof at once, and insurers would almost certainly prefer the entire roof to be the same age, but asphalt does have some advantages for situations in which nearly every storm tears up just a few shingles.