When their asphalt shingle roof has reached the end of its life, most people assume their only option is to strip the roof to bare sheathing before a new roof can be applied. But unless the sheathing is extensively damaged or the structure can’t support the weight of another layer of roofing, a better solution is to apply a new layer of shingles right over the old one. Done correctly, a re-roof job will look as good and last as long as a “new” roof, for a lot less money and a lot less hassle.
Advantages of Reroofing
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 less than a tear-off job. Labor savings go beyond demolition: Not having to lay down felt paper saves money; and site and weather protection, as well as cleanup, are all reduced if not eliminated.
Disposal costs are lower, too, because we don’t have to rent a dumpster. We also save by not having to separate the recyclables. The same is true of flashing, drip edge, tar buckets, vents, and other scrap metal.