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A roof replacement is a significant project to undertake, which is why some people prefer to save money by adding a second layer of shingle roofing on top of an existing structure. While this process is usually less expensive, it is not always the best or safest option. Below is more information about issues you may experience.

What Are the Dangers of Adding New Shingles on Top of an Existing Roof?

1. Add More Weight

When a home is first constructed, the support system is only intended to bear the weight of one layer of shingles. While some extra weight is accounted for in case tree limbs or debris accumulate on the structure, there is not much leniency in the limit. However, when you add a second layer of shingles, you’re significantly increasing the weight of the structure. Over time, this can damage the structural integrity of the roof, causing the rafters to bend or the underlayment to loosen. When these issues occur, roof leaks are more common, potentially damaging your belongings and home.

2. Increase Repair Costs

shingle roofing

If roofing contractors only add a second layer of shingles, they may not fix the problems of the first layer. This can also potentially worsen existing issues. For example, if mold is present beneath the existing shingles, covering them with another layer can trap moisture between the layers, allowing the fungus to spread. This will damage the wooden supports and weaken the overall structure.

Also, if you decide to install a new roof in the future, the labor involved in removing both layers will take more time, which increases the overall cost. Often, replacing shingle roofing entirely is a better investment in the long run.

3. Reduce Property Value

A shingle roofing overlay destabilizes the structure and makes repairs more costly, which can reduce the home's overall value. Plus, the roof may have an uneven appearance, as any curling or cracked shingles in the first layer can create bulges that are visible from the street. These issues are particularly troublesome if you decide to sell the property in the future, as potential buyers might request that you replace the roof or lower the initial asking price.

 

When you need help repairing and replacing your roof, contact Santee Roofing in Kingstree, SC. This licensed and insured roofing contractor serves residents throughout the area, including Clarendon, Florence, Georgetown, and Sumter counties, as well as Florence, Georgetown, Moncks Corner, and Pawleys Island. Call (843) 485-1100 to request an estimate for your home, and visit them online for more information about their services.

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