Sometimes we see roofs that have two layers of shingles. Not completely a huge deal other than tearing off two layers of shingles will raise a new roof price, but having four or maybe even more layers is just plain crazy. Some building codes do not allow more than one layer of shingles and some allow up to two,
contact your local building code office for requirements in your area. When you put extra protection for the underlayment like doing 30# felt instead of 15#, there is really no need for another layer. There are many reasons why it is not a good idea to keep adding layers. There are some that do not care what building codes there are and do not follow them and sadly sometimes it is the same for a building owner as it is a contractor. Always make sure to do your research and if suggested by a contractor to just roof over top of what you have, make sure to contact another professional roofing contractor to get a second opinion. In most cases with the new advances of shingles and other roofing system products, there really is no need to have a second
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How Many Layers of Shingles Can Be on a Roof?When faced with the perceived cost or inconvenience of replacing a roof, some homeowners may consider “re-covering,” or adding a new layer of shingles as an alternative. While re-covering may save some money, mess, and the hassle of removing old shingles, there are considerations that you must weigh. For instance, building codes in your area will limit the total number of acceptable layers of shingles on your roof. Additionally, you will need to consider the type of roof you have and its structural soundness when deciding whether to re-roof or add to your existing roof. How Many Layers Is “Too Many?”There are a variety of factors that determine how many layers of shingles a homeowner can have on a roof, including:
Other Factors to ConsiderIf local building codes allow for an additional layer of shingles, you’re adding composition shingles over composition shingles, and your structure is sound, there are other considerations to examine before moving ahead with re-roofing:
Thinking Long-TermWhile re-covering may seem like a less expensive fix, it may only serve as a temporary band-aid, covering over potentially serious defects and damaging your roof even more. If you are considering re-covering, you should research all options available to you and consider the long-term impact versus the short-term savings. Questions about re-covering or roof replacement in the Portland area? Contact All Surface Roofing to schedule a roof inspection and free estimate. Call us at 503-570-7663 or contact us online today. Related PostsAll Surface Roofing and Construction is licensed, bonded and insured.
We’re Currently Open and Operating Prudently During the COVID-19 PandemicAsk about our financing options which can help in these trying times. Our focus is exclusively on exterior work so there is no need for direct contact with our estimators or crew. We can text, email, call you or talk with you from at least six feet away about your project. Awesome!Start My Free Quote. No thanks, How many layers are allowed on a roof?House roofs should never exceed three layers of shingles. Adding additional layers without excavation can save homeowners up to $1,000 in labor. Therefore, layering has advantages. Building and city codes require roofers to limit shingle layers to two.
Can you do 3 layers of shingles?No, you can't put three layers of asphalt shingles on a roof. In most states, you're only allowed to have two layers of asphalt shingles on a roof for fire safety reasons.
Can you put 4 layers of shingles on a roof?In most states, you're only allowed to have 2 layers of shingles on a roof for fire safety reasons. However, you'll still see roofs that have 3 or 4 layers today. If you already have 2 or more layers, a contractor will recommend a full replacement.
Is it OK to put a new roof over an old one?You can only install a new roof over an old one if the old roof is completely flat and level. Several factors might cause the existence of curling shingles; therefore, it is advisable to involve a professional roofer to determine the cause and replace the shingle before proceeding to a re-roof.
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