Investing in a new roof is a significant expense and one that homeowners expect to last for many years. However, discovering that your newly installed shingles aren’t laying flat can be both frustrating and concerning.

This guide will help you understand:

Why this might be happening
What the implications are
What steps you can take to rectify the issue

Understanding Roof Shingles

Before we dive into why new shingles might not be laying flat, it’s essential to understand what roof shingles are and their purpose. Roof shingles are the outermost layer of a roof system, designed to protect your home from the elements. They are typically made from materials such as asphalt, wood, metal, or composite, and are laid in overlapping rows to provide coverage and prevent water infiltration.

Types of Roof Shingles

Asphalt Shingles: These are the most common type of roof shingle, known for being affordable and durable. They are available in various styles and colors
Wood Shingles: Wood shingles offer a natural appearance although they have a higher cost and maintenance. They are typically made from cedar, redwood, or pine.
Metal Shingles: Metal shingles are long-lasting and durable. They are energy-efficient and available in different metals like aluminum, copper, and steel.
Composite Shingles: Composite shingles are made from a mix of materials and designed to mimic other types of shingles. They’re popular because they are resistant to cracking and warping.

Why Aren’t My New Roof Shingles Laying Flat? 5 Reasons

There are several reasons why new shingles might not be lying flat against your roof. Understanding these reasons can help you determine whether the issue is temporary and manageable or if it requires professional intervention.

1. Installation Issues

One of the most common reasons for new shingles not laying flat is improper installation. Here are some installation-related issues that can cause this problem:

Incorrect Nailing: Shingles need to be nailed in specific locations to ensure they lie flat and stay in place. If nails are placed too high or too low, or if not enough nails are used, shingles may lift or curl.
Inadequate Overlapping: Shingles should overlap correctly to create a seamless barrier against water. Improper overlapping can result in uneven surfaces and shingles not lying flat.
Misaligned Shingles: Proper alignment is crucial for shingles to lay flat. If shingles are misaligned during installation, they may not seal properly and can appear uneven.

2. Weather Conditions

Weather conditions during and immediately after installation can significantly impact how well shingles lay. Some weather-related factors include:

Temperature: Shingles need time to settle and adhere properly. Cold temperatures can make shingles stiff and less pliable, preventing them from lying flat. Conversely, extremely hot temperatures can cause shingles to become soft and susceptible to damage.
Moisture: Installing shingles in wet or humid conditions can prevent proper adhesion. Excess moisture can also cause shingles to swell and warp.

3. Material Quality

The quality of the shingles themselves plays a crucial role in how well they lay on your roof. Some factors to consider include:

Defective Shingles: Manufacturing defects can result in shingles that do not lie flat. Always inspect shingles for any signs of defects before installation.
Low-Quality Materials: Cheaper shingles may not have the same durability and flexibility as higher-quality options. Investing in quality materials can prevent many issues down the line.

4. Roof Deck Issues

The roof deck, or the surface onto which shingles are installed, must be in good condition for shingles to lie flat. Issues with the roof deck can include:

Uneven Surface: An uneven or damaged roof deck can cause shingles to lay unevenly. Ensure your roof deck is smooth and in good condition before installing new shingles.
Old Roofing Material: If new shingles are installed over old roofing material, it can create an uneven surface. It’s generally recommended to remove old shingles before installing new ones.

5. Adhesive Issues

Shingles rely on adhesive strips to seal them in place and ensure they lie flat. Problems with the adhesive can include:

Inadequate Adhesion: If the adhesive strips do not bond correctly, shingles may lift or curl. This can be due to manufacturing issues, weather conditions, or improper installation.
Dust and Debris: Dust and debris on the adhesive strips can prevent proper bonding. Ensure the surface is clean before installing shingles.

Potential Consequences of Shingles Not Laying Flat

Shingles that do not lie flat can lead to several issues, including:

💧 Water Infiltration

The primary purpose of roof shingles is to protect against water infiltration. Shingles that are not lying flat can create gaps and openings, allowing water to seep into your home. This can lead to:

Water damage to the roof deck and underlying structures
Mold and mildew growth
Interior water damage, including stained ceilings and walls

📉 Reduced Lifespan

Shingles that are not properly installed and lying flat are more susceptible to damage from wind, rain, and other elements. This can reduce the overall lifespan of your roof and necessitate premature replacement.

🏠 Decreased Curb Appeal

A roof with uneven shingles can detract from the overall appearance of your home. This can affect your home’s curb appeal and potentially lower its value.

💡 Increased Energy Costs

Shingles that are not lying flat can compromise the insulation properties of your roof. This can lead to increased energy costs as your heating and cooling systems work harder to maintain a comfortable temperature.

6 Steps to Fix New Shingles Not Laying Flat

If you notice that your new shingles are not lying flat, there are steps you can take to address the issue:

1. Inspect the Roof

Begin by conducting a thorough inspection of your roof to identify the specific areas where shingles are not lying flat. Look for signs of improper installation, defective materials, or roof deck issues.

2. Consult the Installation Guidelines

Review the installation guidelines provided by the shingle manufacturer. Ensure that the shingles were installed according to these guidelines, as improper installation can void the warranty and cause issues.

3. Contact the Roofing Contractor

If you suspect that the issue is due to improper installation, contact the roofing contractor who performed the work. Reputable contractors should stand by their work and address any installation-related issues.

4. Consider Weather Conditions

If the shingles were installed in less-than-ideal weather conditions, they may need some time to settle and lay flat. Monitor the roof over the next few weeks to see if the shingles begin to lie flat as they adhere properly.

5. Replace Defective Shingles

If you identify any defective shingles, contact the manufacturer to inquire about replacement options. Most manufacturers offer warranties that cover defects in materials.

6. Repair the Roof Deck

If the issue is due to an uneven or damaged roof deck, you may need to repair or replace the affected areas. This may involve removing the shingles, addressing the roof deck, and reinstalling the shingles.

Preventing Future Issues with Roof Shingles

To ensure that your new roof shingles lay flat and remain in good condition, follow these best practices:

Choose Quality Materials: Investing in high-quality shingles can prevent many issues related to durability and adhesion. Look for reputable brands and consider the long-term benefits of premium materials.
Hire a Reputable Contractor: Selecting a skilled and reputable roofing contractor is crucial for a successful installation. Research contractors, read reviews, and request references to find a contractor with a proven track record of quality work.
Follow Manufacturer Guidelines: Ensure that the installation follows the manufacturer’s guidelines and recommendations. This includes proper nailing, overlapping, and adherence to weather-related guidelines.
Monitor Weather Conditions: Whenever possible, schedule the installation during favorable weather conditions. Avoid installing shingles in extreme temperatures, high humidity, or during rainy periods.
Regular Maintenance: Regular roof maintenance can help identify and address issues early. Schedule annual inspections and address any problems promptly to extend the lifespan of your roof.
Avoid Layering Shingles: While it might be tempting to install new shingles over old ones to save time and money, this practice can lead to uneven surfaces and other issues. Remove old shingles before installing new ones for the best results.

Roofing Shingles That Last

New roof shingles not laying flat can be a source of frustration for homeowners, but understanding the potential causes and solutions can help you address the issue effectively. Whether it’s due to installation errors, weather conditions, material quality, or roof deck issues, taking the right steps can ensure that your shingles lie flat and provide the protection your home needs.

Want to make sure your roof shingles lay perfectly flat? Call on Trust Roofing for roofing results that you can rely on!

New Roof Shingles Not Laying Flat? (What to Do Next)