Call Us: 480-219-9573

Hablamos Español

Flooring Underlayment Fundamentals

Flooring Underlayment FundamentalsWhen it comes to home improvement projects, one often overlooked but crucial aspect is the underlayment beneath your flooring. Whether you’re renovating your living room, bedroom, or even the kitchen, the right flooring underlayment can make a world of difference in terms of comfort, durability, and soundproofing. In this guide, we’ll delve into the basics of flooring underlayment, explaining what it is, why it matters, and how to choose the best option for your specific needs.

What is Flooring Underlayment?

Before we get into the nitty-gritty of underlayment, it’s important to understand what it is. Flooring underlayment is a layer of material that is installed beneath your floor covering, serving as a crucial intermediary between the subfloor and your chosen flooring material, such as hardwood, laminate, carpet, or vinyl.

While it might seem like an optional extra, underlayment offers several important benefits that can greatly enhance the performance and longevity of your floors. Here are some key reasons why flooring underlayment is essential:

  1. Moisture Protection: Underlayment acts as a moisture barrier, preventing any moisture that may seep through the subfloor from reaching your flooring. This is particularly important in areas prone to humidity or moisture, like basements or bathrooms.
  2. Sound Reduction: Underlayment helps to dampen sound, reducing the noise generated by foot traffic or other activities. This is especially crucial in multi-story homes or apartments where minimizing sound transmission between floors is essential for peace and privacy.
  3. Comfort and Insulation: Underlayment provides additional cushioning and insulation, making your floors more comfortable to walk on. It also helps to keep your home warmer in colder months by preventing heat loss through the floor.
  4. Smooth Surface: It creates a smooth, even surface for your flooring material to be installed on, which is important for achieving a professional and polished look.
  5. Durability: Some underlayments can enhance the longevity of your flooring by providing added support and protection against wear and tear.

Types of Flooring Underlayment

Now that you understand the importance of underlayment, let’s explore the different types available:

  1. Foam Underlayment: This type of underlayment is made from foam materials like polyethylene or polypropylene. Foam underlayments are lightweight and easy to install. They offer good cushioning and sound absorption properties, making them an excellent choice for laminate and engineered wood flooring.
  2. Cork Underlayment: Cork underlayment is a natural and eco-friendly option. It has excellent soundproofing properties and is comfortable to walk on. Cork is often used under hardwood and laminate floors.
  3. Rubber Underlayment: Rubber underlayment is known for its exceptional durability and sound absorption. It’s a common choice for commercial spaces and can also be used in residential settings, particularly under tiles or hardwood.
  4. Felt Underlayment: Felt underlayment is made from recycled fibers, making it an eco-friendly option. It provides good cushioning and is often used under hardwood floors.
  5. Combination Underlayment: Some underlayment products combine various materials to provide a mix of benefits, such as moisture resistance, soundproofing, and cushioning. These versatile options are suitable for various types of flooring.
  6. Specialized Underlayment: In specific cases, such as installing underfloor heating systems, specialized underlayment designed for this purpose should be used to ensure safety and efficiency.

Choosing the Right Underlayment

Selecting the appropriate underlayment for your flooring project requires careful consideration of several factors:

  1. Flooring Type: The type of flooring you plan to install will largely dictate the underlayment you need. For instance, hardwood flooring may require a different underlayment than carpet or vinyl.
  2. Subfloor Condition: Assess the condition of your subfloor. Is it level, dry, and free of imperfections? Different underlayments are better suited for different subfloor conditions.
  3. Moisture Level: If you’re installing flooring in a moisture-prone area, like a basement, choose an underlayment with excellent moisture resistance.
  4. Soundproofing Needs: Consider the level of soundproofing you require. If you live in a multi-story building or have a home theater, sound reduction may be a top priority.
  5. Budget: Underlayment materials vary in cost. While it’s essential to choose a quality underlayment that meets your needs, you should also consider your budget.
  6. Installation Method: Some underlayments are easier to install than others. Ensure you’re comfortable with the installation process or hire a professional if needed.

Installation Tips

Proper installation is key to maximizing the benefits of your underlayment. Here are some essential tips:

  1. Clean and Prepare the Subfloor: Ensure the subfloor is clean, dry, and free of debris before laying the underlayment.
  2. Use Proper Fasteners: If the underlayment requires fastening, use the recommended fasteners and spacing guidelines provided by the manufacturer.
  3. Overlap Seams: If your underlayment comes in rolls or sheets, make sure to overlap seams and tape them to prevent moisture penetration.
  4. Follow Manufacturer Guidelines: Always follow the manufacturer’s installation instructions for your specific underlayment product.
  5. Acclimate the Underlayment: Allow the underlayment to acclimate to the room’s temperature and humidity for the recommended time before installation.
  6. Check for Compatibility: Ensure that the underlayment you choose is compatible with your chosen flooring material and adhesive.

Common Mistakes to Avoid

Avoid these common mistakes when dealing with flooring underlayment:

  1. Skipping Underlayment: Never skip the underlayment step, as it provides essential benefits for your floors.
  2. Choosing the Wrong Type: Select an underlayment that suits your flooring type and specific needs. Don’t assume that one type fits all.
  3. Improper Installation: Rushing through the installation process can lead to problems down the line. Take your time and follow instructions carefully.
  4. Neglecting Moisture Control: Failing to address moisture issues can result in mold, mildew, and damage to your flooring.
  5. Overlooking Soundproofing: If sound reduction is a priority, invest in the appropriate underlayment to create a quieter living environment.


In the world of home improvement, it’s easy to focus on the more visible elements of a project, such as the flooring material itself. However, the often-overlooked underlayment plays a vital role in the performance and longevity of your floors. By understanding the basics of flooring underlayment and choosing the right type for your needs, you can ensure that your flooring project is a success, providing comfort, durability, and peace and quiet for years to come. So, before you take on your next flooring project, remember the importance of what lies beneath – your underlayment.

Read next: Best Flooring Options for Humid Climates

Related posts