Roofing-over-shingles, if conditions are right, new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. installation is easier than for a tear-off job because you can use the existing shingles as guides for laying the new ones. but you must take care to install shingles correctly so they lie flat.. Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4/12 pitch or less, and three layers on steeper roofs. if the structure can support the added weight, a typical 20-square (2,000-square-foot) reroof will cost at least $1,000 less than a tear-off job., a metal roof is an alternative to a shingle covered roof, but a metal roof can actually be installed over shingles. however, you should only install a metal roof over shingles if you have less than four layers of shingles on the roof. otherwise, you will need to remove the shingles. step 1.
By placing metal roofing over shingles, you can save in the labor costs of ripping them off while also preventing them from being thrown into landfills. metal roofs over shingles will also provide an extra layer covering your home, helping to further insulate it. disadvantages of metal roofs, reroofing over old asphalt shingles is cheaper than a complete tear-off, but to look good and last long, the new shingles have to lie flat. a veteran roofer explains how to use special flashing, filler strips, and careful layout for a perfect job every time. get jlc news in your inbox!.
If you are looking to save time, installing new shingles over old shingles is a possible roof replacement solution. you want to be sure that you will be installing the shingles over only one other layer, though. the third layer of shingles will be too heavy to be supported., re-roofing used to be pretty straight forward with 3-tab shingles. the standard practice was that you could install a new layer of singles directly over the old layer during a re-roof. most people would limit this practice to a total of two layers of shingles..
When contemplating a new roof, many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch. although it sounds like a good idea, we can assure you the cons heavily outweigh the pros. in fact, the only pro to a shingle over is it’s cheaper and cleaner.