Brutal UV load 01
El Paso runs over 300 sunny days a year at 3,800 feet, where the atmosphere filters far less UV than it does at sea level. That radiation cooks the oils out of asphalt shingles. The granules let go, the mat underneath gets brittle, edges curl, and a shingle rated for 30 years somewhere else gives you 15 to 20 here. On tile roofs the tile outlives everybody — it's the underlayment baking underneath that fails, usually right when the owner assumes tile means forever.















