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How Many Layers Of Roof Shingles Are Allowed In Montana?

Date: March 30, 2023

If you’re a homeowner in Montana, you may be wondering how many layers of roof shingles are allowed on your property. Roof shingles can provide protection and insulation to your home, but having too many layers can actually do more harm than good. 

In this blog, we’ll explore the regulations in Montana and offer some advice on how to maintain your roof properly.

What are roof shingles?

Roof shingles are a popular and widely used roofing material that is designed to provide a durable and protective layer to your home's roof. They are typically made up of small, flat, individual pieces that are arranged in overlapping rows, creating a barrier that shields your home from the elements.

There are several different types of roof shingles available, and they can be made from a range of materials, including asphalt, wood, metal, and clay. Asphalt shingles are the most common type of shingle, and they are often the least expensive option. They are made from a combination of asphalt and fiberglass and are known for their durability, affordability, and ease of installation.

What is the maximum number of layers of roof shingles permitted in Montana?

how many layers of roof shingles are allowed

According to the International Residential Code (IRC), which is adopted by most states in the US, including Montana, you are allowed to have up to two layers of roof shingles installed on your home. This means that if you already have one layer of shingles on your roof, you can add another layer on top of it.

However, it’s important to note that adding a second layer of shingles can add extra weight to your roof, which can cause structural damage if not properly supported. It’s also important to consider that if your existing roof is already damaged or leaking, adding another layer of shingles will not fix the underlying problem.

What are the risks of having too many layers of shingles?

Having too many layers of roof shingles can lead to a variety of problems, including:

  1. Structural damage: As mentioned, the weight of multiple layers of shingles can put a strain on you roof’s structure, causing damage or even collapse.
  2. Poor insulation: Multiple layers of shingles can reduce the effectiveness of your home’s insulation, leading to higher energy bills and decreased comfort.
  3. Moisture damage: Layers of shingles can trap moisture, leading to rot, mold, and other types of water damage.
  4. Reduced lifespan: Multiple layers of shingles can cause premature wear and tear on your roof, reducing its lifespan and requiring more frequent repairs or replacement.

How to maintain your roof properly?

To ensure the longevity and effectiveness of your roof, it’s important to perform regular maintenance, including:

  1. Inspect your roof regularly for damage, leaks, or other issues.
  2. Clean your roof and gutters regularly to prevent the buildup of debris and water.
  3. Remove any snow or ice buildup from your roof during winter months.
  4. Hire a professional roofing contractor for any repairs or replacements.


As a homeowner in Montana, it’s important to know the regulations regarding the number of layers of roof shingles allowed on your property. While you can have up to two layers, it’s crucial to consider the risks of having too many layers, such as structural damage, poor installation, moisture damage, and a reduced lifespan. 

To maintain your roof properly and ensure its longevity, performing regular maintenance and hiring a professional roofing contractor for any repairs or replacements is essential. By taking care of your roof, you can protect your home from the elements and maintain its safety and comfort for years to come.

Additionally, if you ever need professional roofing services in Montana, Brix Systems is always on the go to provide you with high-quality solutions. We have a team of experienced and certified professionals who can handle any roofing project, from repairs and maintenance to complete roof replacements. Contact Brix Systems today to schedule a consultation and ensure the protection of your home.


International Residential Code, Section R907 - Roofing,

Montana Department of Labor & Industry - Building Codes Bureau,

Roofing How to tell how many layers of roofing you have
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