Interior Underlayment Header

Interior Underlayment

Learn about Interior Underlayment possibilities with Azdel Onboard® composite sheets

Flooring Underlayment

On our Landscaping page we explained how Azdel Onboard® composite works well as an underlayment for pavers, etc. Similarly, our composite sheets perform more than adequately under a variety of interior flooring types.

Whether you are working with a wood or concrete subfloor, this composite will serve you well. The material will breathe sufficiently, but not expand in typical interior environments. It is lightweight, easy to cut, and has excellent sound absorbing properties. Cork can work, but it breaks easily and retains moisture. Our composite does neither.

Simply lay the sheets perpendicularly to the direction of your floor planks. The top or bottom of our raw sheets do not matter. However, should you wish to have a better vapor barrier, say over a concrete floor, then consider using a version with a film finish, and place the composite with the film side up for best results.

Flooring Underlayment

We created a large structure to demonstrate how Azdel’s composite panels work well for both flooring underlayment and wall coverings. Because this section is about flooring, the wall is faded out. You can learn about the wall coverings on our page entitled, Interior Wall Décor Panels.

Interior Floor Underlayment

Underlayment with Vapor Barrier

While not all flooring types require a vapor barrier, we have grouped together the most common types in this section.

  1. Typical wood subfloor
  2. Azdel Onboard RVX composite with Piko, a very light and waterproof polypropylene film that serves as a vapor barrier. The film is available in three colors — black is pictured — but the color does not matter. The sheets are available in thicknesses of 2.7mm, 3.6mm and 4.7mm. The film is on one side and should face the surface from which the most moisture or temperature change will come. It’s less critical to use a vapor barrier on a wood subfloor than on concrete. On concrete, the film should be faced down. Our composite also reduces thermal transmission.
  3. Vinyl or Linoleum flooring roll. Both are their own vapor barrier. As such, the Azdel with Piko may be faced down or you may use an unfinished (raw) version.
  4. Vinyl plank flooring. These are usually a floating floor. Install as you would.
  5. Wood planks, either laminate or hardwood. Install as you would.
  6. Ceramic tile. Install as you would with mortar and grout. You may find the mortar adheres better to the unfinished surface.

Please visit our Contact Us page to reach out and learn more!