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3 layers of shingles on roof

Are 3 Layers of Shingles on Roof Okay?

Shingles have been an integral part of any roofing system for centuries since they serve as the first line of defense against rainwater, snow, and strong winds that can damage your roof. However, just like every other roofing and building material out there, roof shingles are not perfect and they can still be damaged and deteriorate over time. Eventually, you’ll need to replace the shingles on your roof. 

However, there are other ways of saving up time and resources. One thing that most contractors and homeowners do is overlay shingles on top of each other. Usually, this is a good way of expediting the process of re-roofing, but will also have some repercussions.

But before we get into what’s the most optimal amount of layers that you can place on your roof, we have to first look at what are the pros and cons of overlaying shingles. 

Advantages of Overlaying

Cost Effective

The most common reason why homeowners choose to overlay their roof is that it’s a cheaper alternative than having to tear down a whole roof and replacing it with fresher roofing materials.  

Saves You Time

when you’re tearing off a roof, you have to go through multiple processes of tearing off the roofing materials for each layer. However, when you’re overlaying, you can skip multiple processes. 

It’s Not Messy

Right after tearing off a roop, you’ll be expecting a lot of debris falling off from your roof which can leave a mess. When you’re overlaying, you won’t have to clean up any debris from the re-roofing process.

Disadvantages of Overlaying

Yes, there might be some advantages to overlaying your roof, but we have to also take into account that there will always be some repercussions in having too many layers. Again, it’s always a good practice to consult your roofing specialist first. 

Can Conceal Damage

Sure, overlaying can conceal damages and is away from the visible eye, but this will inadvertently lead to more damages for the newer layer in the future. If ever you have molds and mildews on the older layer, this could spread to your newer layer and slowly chip away at the integrity of it. 

Accumulated Weight

Certain roofing materials like slate tile roofs can weigh over a ton. Can you just imagine stacking 3 heavy roofing materials over each other? Having too much weight on your roof can cause damage to the supporting structures of your roof. Moreover, this can drastically affect the lifespan of your roof as it will bend and break your steel and wooden beams. 

Will Affect Inspection Reports

If you’re planning on increasing the monetary value of your home, a home inspector will view multiple layers of shingles as a negative for your home since this can imply that there are damages that have been concealed and organic growth could easily make its way towards the newer layer. 

More Insulation

A rule-of-thumb for roofing specialists is that the thicker your roof is, the more insulation that it will give to your home. Sure, this might seem like a good way of retaining heat during colder climates, but this will cause inhabitants to feel uneasy about warmer climates. Moreover, moisture could be trapped inside your home from too much insulation which can result in the growth of molds and mildews. 

Ultimately, overlaying shingles on top of each other might have advantages, but there are also disadvantages that have to be weighed in when considering your roofing Wilmington DE. But of course, you have to take into account the certain roofing material that you’re installing since each type of shingle has its own unique properties.

While there are some that bode well with overlaying, there are other shingles that do not bode well with having another set of shingles placed on top of it. However, consulting your roofing contractor will give you an extensive answer based on the specific roofing material that you’re using.

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