This will also be constrained by other factors.

Three layers of shingles on roof. The third layer is a waste only lasts a few years maybe. 3 layers of shingles may be too much weight for your roof structure i 39 d be concerned about the roof collapsing. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. Architectural shingles make up most roof replacements today as their cost is only marginally more than 3 tab and they come with far superior specifications and warranties.

Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing 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. This is especially true if you ve overlayed your new shingles on top of warped shingles. This structure must support this weight and the weight of other things snow and ice come to mind.

I 39 d really worry come winter. How many layers of shingles are allowed on a roof. Asphalt shingles come in two major types 3 tab and architectural. Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles.

Benefits of adding multiple shingle layers. So it may only be 2 layers of roofing. In some instances 3 layers may be allowed but this is rare. Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles.

Each layer of shingles puts weight on your roof structure. If you counted it that way you are going to have 3 layers instead of 2 because the first row of shingles at the roof edge is doubled. Adding an extra layer of shingles when the first layer has met it s life expectancy can buy a few more years. That limit pertains to roofs with up to a 4 12 pitch.

Also what the individual said about are you counting the layers at the roofs edge he had a good point. Most areas only allow for a maximum of two layers. 3 tabs are less expensive but also less durable have lower wind resistance and have a flatter appearance. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

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