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

Regulations allow a maximum of two layers of shingles on a roof but experts say you shouldn t lay asphalt shingles over an existing roof.

How many layers of shingles are allowed on a roof in illinois. I don t know whats legal in illinois but the general rule on roofing is a max of 2 layers on a roof. Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. The shear weight of multiple layers of roofing shingles can cause stress on the framing of a roof and could cause truss s or rafters to bow and or break.

Some municipalties allow only two layers. For example cedar or tile roofs are only allowed one layer. It is acceptable to have a maximum of three layers of shingles installed on a roof. Other factors to consider.

Some municipalties allow only two layers. There are a few reasons why i don t like multiple layers of roofing shingles on a roof. If the current roof is in poor shape re covering may not be a sound choice. The weight of 5 layers of shingles on a roof is a bad thing in itself surely in snow country.

The soundness of the building you re re roofing is another consideration. In most cases two layers of shingles is advisable and three aren t normally required but if you live in an area that suffers from particularly strong wind or lengthy periods of heavy rain then you may want to consider a third layer. 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. So we ll start at the bottom of the deck and work our way up through all the roofing layers until we reach the shingles and sunshine above your roof.

That limit pertains to roofs with up to a 4 12 pitch. Eliminating the tearoff can easily save 1 000 or more on a new roof but you re really just delaying the cost. What are the indicators that a shingle roof needs to be replaced. Roofing layers from the framing to the 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. For example there s a starter course of roofing shingles installed at the eaves before the roofing shingles you can see. A roofing contractor will know exactly how many layers of roof shingles are allowed in your area for your building but it is normal that you will be permitted up to three layers of shingles.