Free Roof consultation! Has anyone ever told you to put two or three layers on a roof? Well that’s not great advice. Some roofing contractors will do one or two layers of asphalt shingles. The reason this isn’t good is because there is a lot of detailed flashings around penetrations. When you replace your roof it’s really important that you don’t skip these details . If the penetrations were skipped, then you probably won’t get the proper amount of lifetime from your roof. This roof in Yorktown had that problem. They hired us for a roof replacement.