How Many Layers Of Shingles Are Allowed On A Roof In Michigan

On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.

How many layers of shingles are allowed on a roof in michigan.

For many years it was acceptable to put even the third layer. Generally it is fine to have three layers of shingle codes but you should check this is the case with your local building permit people and you should make sure that your roof and the rest of the structure have the strength to cope with the extra weight. However due to many manufacturer s recommendations and proper installation techniques most roofing projects start with removal of old material. By not removing the first layer of shingles homeowners would be able to save on labor costs and shorten the time frame of the job.

Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles. According to the international existing building code homes can be re roofed one time by applying a second layer of roof shingles over the existing one but after that application begins to wear both layers need to be removed before a brand new roof is installed. By code two layers of shingles are allowed. There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan.

When it s time to replace your roof there are several factors that might lead your roofing professional to recommend adding shingles on top of your existing layers. This allows us to inspect the wood substrate and use new underlayments which are key to the roof s ability to protect your home. For example cedar or tile roofs are only allowed one layer. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.

Though both these points are valid you will end up spending the same amount of money or more later to have two layers of shingles removed. Asphalt shingles typically can have one more layer added over the top two roofs total. If you already have 2 layers and need a new roof both layers must be removed before new roofing can be installed. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

You are allowed only 2 layers. If the current roof is in poor shape re covering may not be a sound choice. In fact depending on the building codes in your area while you may be allowed to add a second layer per code while you own the home you may not be able to pass inspection with a second layer. In many cases potential buyers either skip over the home altogether to avoid the hassle or demand the seller reduce the cost to cover a new roof.

Adding a second or third layer of shingles adds significant weight to the structure. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. Steep sloped roof products such as tile slate metal and shakes only allow one layer.