Also what the individual said about are you counting the layers at the roofs edge he had a good point.

Three layers of shingles on roof. I 39 d really worry come winter. 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. So it may only be 2 layers of roofing. 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.

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. This will also be constrained by other factors. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. In some instances 3 layers may be allowed but this is rare.

The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. Maybe 5 10 years but the life expectancy of second layer is less than it could be 10 30 years. 3 layers of shingles may be too much weight for your roof structure i 39 d be concerned about the roof collapsing. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.

Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles. Benefits of adding multiple shingle layers. This is especially true if you ve overlayed your new shingles on top of warped shingles. The contractor may do a walk on the roof and also inspect from the attic for any rot before installing a second layer of shingles.

Each layer of shingles puts weight on your roof structure. That limit pertains to roofs with up to a 4 12 pitch. This structure must support this weight and the weight of other things snow and ice come to mind. 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.

The third layer is a waste only lasts a few years maybe. Adding an extra layer of shingles when the first layer has met it s life expectancy can buy a few more years. 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. Most areas only allow for a maximum of two layers.

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