How Many Layers of Shingles Can You Put on a Roof?

Thrifting supports a homeowner’s need to complete projects to the best of their abilities. Those abilities exist inside the parameters of financial and professional possibilities. Depending on the type of roof material used, the number of layers added to a roof range from two to three times. 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. Nonetheless, roofers working on older houses sometimes find shingle layers as high as four. This method of shingling does cut down on costs of excavating existing shingles but causes a strain on the house between the trusses. Roofers expected to carry one shingle bundle up standing ladders and roofing ladders know the weight is roughly sixty-five pounds. Strain on the gaps between the trusses may cause the backing boards in the attic to crack and eventually allow moisture to seep through to the attic.

High quality asphalt shingles are the best roofs to install multiple layers on. Quick to install, cheap and quite weightless compared to other materials, asphalt roofing still poses its threats when laid on top of the first. If a typical home has 1,700 square feet, a roofer team expects to use 17 squares equaling a total of almost six thousand pounds on the roof. Imagine adding an additional six thousand pounds per layer over three decades. This multiplier corroborates a safe philosophy of no more than two.

Asphalt shingles are the most layer-able material, yet roofers reported wood, metal and even rubber shingles under modern asphalt types. This proves alarming especially to homeowners paying full price for roofing services. Layering new shingles on top of a completely different shingle type instigates a handful of problems including heat trapping, accelerating shingle decay, and lowering appraisal values if inspectors notice corners were cut to save time and money.

Please pinpoint when multiple shingle layering illustrates smart and industrious carpentry. This practice presents acceptable results only during the most favorable scenarios. Use vigilance to decide if thrifty ideas are best for the homeowner’s finances and structural integrities of the home.

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