Photomicrograph of a volcanic lithic fragment (sand grain); upper picture is plane-polarized light, bottom picture is cross-polarized light, scale box at left-center is 0.25 millimeter. Volcanic rocks are usually fine-grained or aphanitic to glass in texture. They often contain clasts of other rocks and phenocrysts.
I paid almost $13,000 to have Duration Premium shingles installed on my central Florida home in late 2007. I went with Owens Corning Duration Premium shingles because of their premium quality, their lifetime warranty and their high wind resistance. Within 3 months of the installation, I started having leaks.
While 3-tab shingles often only offer 10 to 20 years warranty protection, warranty protection for dimensional shingles may last 30 years to a lifetime. These will almost always be more than $1 per square foot (or $100 per square). However, they will hold up to most severe weather and sun exposure as well as high winds. Interlocking shingles are similar to dimensional shingles, but they are applied one at a time rather than in strips or sheets.