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Message: [QUOTE="721Comstock, post: 3624382, member: 5429"] It is absolutely OK to put new shingles over a layer of old ones, if that roof is still in OK shape. It’s also a LOT cheaper, and adds a slight amount of insulation to your house. I worked for a roofer for a year or so after college while I was in between “real” jobs. The 2 types of roof jobs are “up and over” and “rip-off”. “Up and over” is going over the original layer of shingles. It is quick and ‘cheaper’. “Rip-off” means you have to remove the existing layer(s) of shingles, using tools that look like a flat shovel with large ‘teeth’ at the end. You then have to collect all of that debris in a roll-off dumpster, and haul it away. It probably costs 2-3x more to do this, due to labor costs & the dumpster & dump fees. [/QUOTE]