The Pros and Cons of Using Underlayment: Enhancing Flooring Performance



Underlayment plays a crucial role in enhancing the performance and longevity of flooring materials. It is a thin layer of material installed between the subfloor and the finished floor covering. While underlayment offers numerous benefits, it is essential to consider both the advantages and disadvantages before making a decision. This essay explores the pros and cons of using underlayment, shedding light on its impact on different types of flooring and overall flooring performance.

Pros of Using Underlayment:

1. Sound Insulation:
One of the significant advantages of underlayment is its ability to reduce noise transmission. It absorbs impact sounds and minimizes the transfer of sound waves between floors, creating a quieter and more peaceful environment. This is particularly beneficial in multi-level buildings or rooms with high foot traffic.

2. Moisture Protection:
Underlayment acts as a barrier against moisture, preventing water vapor from seeping through the subfloor and damaging the flooring material. It can help mitigate problems such as warping, swelling, and mold growth, especially in areas prone to moisture, such as basements or bathrooms.

3. Comfort and Cushioning:
Underlayment provides additional cushioning and support, making the floor more comfortable to walk or stand on. This is especially important for flooring materials like hardwood or laminate, which can feel hard and unforgiving on their own. Underlayment helps absorb impact and reduce strain on joints, providing a more pleasant experience underfoot.

4. Thermal Insulation:
Underlayment materials with insulating properties help improve thermal efficiency by reducing heat loss through the floor. This can result in a more comfortable indoor environment and potential energy savings, particularly in colder regions. Underlayment with thermal insulation properties also reduces the impact of cold floors on bare feet during colder seasons.

5. Smoothing Subfloor Imperfections:
In cases where the subfloor has minor irregularities or imperfections, underlayment can help create a smoother surface for the finished flooring material. It acts as a buffer, reducing the visibility and impact of small bumps or depressions on the subfloor, ensuring a level base for the final flooring installation.

Cons of Using Underlayment:

1. Added Cost:
One of the primary concerns associated with underlayment is the additional cost. Depending on the quality and type of underlayment chosen, the expenses can add up, especially for larger areas. This cost consideration becomes more significant if the subfloor is already in good condition or if the selected flooring material doesn’t require underlayment for installation.

2. Increased Installation Time:
Installing underlayment adds an extra step to the flooring installation process, which can increase overall installation time. It requires careful preparation, measurement, and proper installation techniques to ensure optimal performance. For time-sensitive projects or situations where quick installation is desired, the additional time required for underlayment may be seen as a disadvantage.

3. Limited Benefits for Some Flooring Types:
While underlayment offers several advantages, some flooring materials may not require or benefit significantly from its use. For example, certain types of tile or vinyl flooring are already designed to be highly moisture-resistant, reducing the necessity for additional moisture barriers. Using underlayment with such materials may not provide substantial benefits, leading to unnecessary expenses.

4. Height Increase and Door Clearance:
Installing underlayment can slightly increase the overall height of the flooring. This may result in clearance issues with doors, particularly if the space between the finished floor and the doorframe becomes too narrow. In such cases, adjustments to the door or doorframe may be required, adding to the complexity and cost of the installation process.

5. Potential for Trapped Moisture:
Although underlayment helps protect against moisture, improper installation or selection of non-bre

athable materials can potentially trap moisture between layers, leading to long-term issues such as mold or mildew growth. Careful consideration should be given to selecting the appropriate underlayment material for specific flooring and environmental conditions to mitigate this risk.


Underlayment offers various advantages that can significantly enhance the performance and durability of flooring materials. It provides sound insulation, moisture protection, comfort, thermal efficiency, and subfloor leveling. However, it is essential to consider the potential drawbacks, such as added cost, increased installation time, limited benefits for certain flooring types, height increase, and the potential for trapped moisture. Weighing the pros and cons and evaluating the specific requirements of the flooring project will help make an informed decision regarding the use of underlayment, ultimately leading to a successful and satisfactory flooring installation.