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Can you put 2 layers of architectural shingles?

Jan 15


Can I add a second layer to my roof? Yes, but probably not. A layover is when you add a second layer to your roof. The Wood shingles design will likely turn down this job. While there are many reasons to not do spot repairs on your roof and instead should replace it entirely, a layover is a unique situation that deserves careful consideration.

The Old Normal

Layovers were once common. Older customers often wondered, "Why do you tear off the roof?". But new roofing technology has made layovers unnecessary. This is good news as it prevents you from all the negative effects of a layover. Layovers would prevent you from installing leak barriers or synthetic underlayers.

It's not always possible

Layovers are not as easy as putting on another layer of shingles. It's more difficult than just putting on a single layer. Because of the complexity of installing valleys, intersections, and steepness, it can be more difficult. Your second layer is also more vulnerable due to these intricacies, which can compromise the integrity of your entire roof.


Keep in mind, however, that your roof was built to support a specific weight. Damage can result from excessive stress on the roof framing or roof rafters. On average, a roof contains two to three tonnes of shingles. It is possible to remove all the weight and add on the same amount. The second layer of shingles will double that weight.

It's not attractive from an aesthetic standpoint

The Installing architectural shingles  won't be flat and will have a different appearance from the first. It's an additional set of shingles that have been placed on top of an existing set. Your new shingles are more likely to break off.

You don't need to be waterproof!

Although you may believe that adding shingles to your roof will make it more waterproof, the reverse is true. The second layer of shingles will hide the source of any potential leaks and prevent you from seeing the plywood underneath. The technology in roofing has advanced to the point that your roof is waterproof. It's not what is under your roof that makes your roof waterproof, but what's underneath a second layer.

Hidden Signs of Damage

You should consider a layover if you leak. If so, it's probably time to replace your roof. Poor workmanship is most likely to be the cause of a leaky roof that is less than 10 years old. Your roof should be replaced if it is more than 15 years old. It will be harder to determine when your roof should be replaced completely if you have a second layer of shingles.


You should replace your roof if you see signs like algae and mould, flashing damage or cement damage, worn or damaged roofing shingles, fibreglass particles collecting around your home, or curling, peeling, or blown-off shingles. If there is a layover, you won't see any of these signs.

What is the best time to install a layover?

Layovers are the same as applying a bandage to a wound. It's not right, and it only makes matters worse. Even the best conditions for a layover don't always work out. You would need to be able to see the signs that a roof repair is required. A layover can be disastrous for your roof.


Your roof's integrity and lifespan will be affected if you add a second layer of shingles. Because shingles don't have a second layer of roofing shingles, they aren't meant to be added. The first layer will age faster due to all the heat and moisture that is added.

How long it would take to install a layover

The same factors that affect the time it takes to install a layover also influence how much would take to complete a full replacement.


The pitches are a measurement of the steepness of your roof. Because of safety concerns, the steeper your roof is, the installation will take longer. This is especially true for older roofs, as the crew would have to walk on damaged shingles. This could be a reason why a layover is not possible.


Layovers on complex roofs take longer. A facet is a name for each part of a roof. A typical A-Frame roof features two facets. One on each side. Complex roofs are visually appealing and would make your home look better. The second layer of shingles will not lay flat and will look different from the first. It will also be more susceptible to curling, peeling, and blow-offs.


Flashing is used to prevent water damage. Flashing is necessary because roof protrusions, and areas where the roof meets the wall, are what prompted the need for flashing. You're creating more protrusions between your roof and the wall.


Valles, which are points where two planes meet, can increase the time required to install a layover because they require more care. Installing a layover requires more care than a complete replacement because it creates more contact between planes.

Layovers: Why?

A layover is a roof that can accommodate a layer of shingles. If the new roof only has one layer, then it raises the question: "Why do you layover?" Layovers are quicker and cheaper than a traditional roof. A layover will take you longer as there are more factors to consider.

Flipping a House

Layovers might be an option if you are flipping a house or need to save money. You'll also be passing on the responsibility to another person to repair the house, which may not be ethical or good for your reputation. A layover costs the same as a full replacement. The layover will not look as good as a complete replacement.

Money Savings

A layover won't save you any money. But there are other ways to pay for your roof if funds are tight. A payment plan is an option. If you have enough equity, you may be eligible for a low-interest loan. You can also get a cash-out to refinance, which allows you to get a new mortgage on a home with more than you need to pay your debts.