If you're replacing your roof, you will have several decisions to make, such as what shingles to purchase and what contractor to hire. In the event that your current roof only has one layer of shingles on it, you will need to decide whether to add a second layer on top of the existing shingles or tear the old shingles off and replace the entire roof. Many people are tempted to just add a second layer of shingles because it costs less and the job can be completed faster, However, in many cases adding a second layer of shingles instead of having the old ones removed is not a good idea. Some of the top reasons not to add a second layer of shingles to your roof include:

Your Roof Will Not Last as Long

While simply having a second layer of shingles added on top of your current shingles costs less up front, it can actually be more expensive in the long run. This type of roofing replacement can actually drastically reduce the lifespan of your roof, so it will last fewer years than if you have the old shingles removed and new ones installed. In addition, a second layer of shingles can add a lot of weight to your roof, putting it under stress. If your roof is too heavy, the areas between rafters can begin to sag, and when that happens, it is possible for moisture to get trapped, leading to mold and decay.

Your Roof Will Be Less Visually Appealing

If you're replacing your roof, it is most likely because your old shingles are damaged, missing, or starting to curl. When your old shingles are not in good condition, you can't expect a new layer of shingles to lie perfectly flat like they would if the old shingles were removed first. Thus, the overall appearance of a roof with two layers of shingles may not be appealing, and in some cases, the imperfections may be noticeable and prevent your roof from looking as nice as a brand-new roof should.

There May Be Issues When You Sell Your Home

If you're planning on selling your home in the next few years, you may want to think twice about adding a second layer of shingles to your roof instead of having the first layer of old shingles removed. When you have two layers of shingles on your roof, it will be noticed by a home inspector during a home inspection. Having two layers of roofing shingles is typically considered a bad thing, even though it is legal, and it will most likely show up as a negative in a home inspection report, which can cause a number of issues. 

Reach out to a roofing company such as Ron Raffo Roofing to learn more.