How Many Layers Of Shingles Are Allowed On A Roof? 

how many layers of shingles are allowed on a roof

There are some instances that homeowners do not have the time and resources on tearing down a roof and using a different set of materials. They will place another layer of shingles on top of the older layer of roofing materials.  Although this might save money in the short-term, this can also lead to some problems arising.  

Can You Add Layers To Your Roof? 

New layers of shingles can be added to a roof, but there are more factors that need to taken into account.  Overlaying might have its benefits, it can also inadvertently cause some damage to a new layer of shingles if the older layer was not inspected properly. 

It’s best to do a thorough inspection of a roof first and make sure there are no damages.  That can be a tell-tale sign of future damages to come on the new roofing layer.  Some communities don’t allow multiple layers of roofing materials as stated in their building codes and regulations.  If someone is planning on adding new layers, it’s best to do some research on the laws in their area first. 

Should You Add Layers?

Most homeowners would say that having multiple layers of shingles can keep your roof waterproof, this is not true.  This may even contribute to more problems, so why do homeowners overlay their roofs?  To save time, money, and energy.  By keeping the shingles on, you are saving energy that would have gone towards tearing your roof off and then creating a mess.  Moreover, you’ll be able to save thousands of dollars of labor costs from roof replacements. 

Why Shouldn’t You Add Layers? 

As to what we have discussed above, there are more problems that overlaying can cause than having the potential benefits. 

Shingles Are For Flat Surfaces 

Shingles are not designed to bridge over gaps, bumps, and bulges. 

Accumulated Weight 

In some cases, roofing materials can weigh over a ton.  Imagine if a home does not have a strong support structure? This can lead to several other problems with a roof’s interior structure.

Harder To Replace Underlayment 

If someone decides to replace or remove the older layer below the new layer, then you’ll have to tear both of the layers down which can cost an exorbitant amount of money. 

Will Affect Warranty 

If someone is planning on overlaying, be sure to consult with a manufacturer first if there would be any issues with the warranty. 

Building Codes Might Not Allow It

If the building codes of a community does not allow a person to have multiple layers of shingles, then it’s best not to have multiple layers.  Laws are there for a reason and it’s to ensure a persons safety. 

Might Not Look Good On A Report  

If someone is planning on increasing the value of their home, then having multiple layers of roofing materials can look bad on a report.   Inspectors won’t be able to look at what’s underneath your new roof. 

Again, if someone is still undecided about whether they should be overlaying or not, it’s best to consult a professional roofer. 

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Matt Kowalis

Marketing Manager for Central Roofing LLC

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About Central Roofing

Central Roofing is a top quality roofing company in Sullivan, IL that likewise operates in Mattoon and Champaign, and the rest of Illinois. We offer a wide array of roofing services to property owners like you. We have been the leading go-to roofing company of homeowners, business owners, and property managers for almost a decade now here in Illinois.

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