View Slate Vs Asphalt Shingles US . 30 year asphalt shingles, 15 year. Both asphalt shingles and slate tiles are common in maryland, and we specialize in installing both. GAF Timberline High Definition | Herman's Supply Company from hermanssupply.com By most estimates, asphalt shingles make up some 80 percent of the residential roofing market. Metal roof vs shingles cost, pros & cons. Both types of asphalt shingles are among the most affordable roofing products. Organic shingles have a heavy felt layer under the asphalt. Here we describe what can go wrong when using a roofing stapler on asphalt. We shot ice at four roof samples: Asphalt roof and shingles pros and cons. If you plan on installing a slate roof, you need to make sure that the frame of the house can support the weight or the material. Source: www.1stchoicehs.com Metal roof vs shin...