Overlay moisture barriers are materials that are rolled out and installed under the flooring. These barriers can be made from paper, tar, or plastic and are suitable for use on a variety of subfloors, including OSB, particle board, plywood, and concrete. One of the benefits of overlay moisture barriers is their ease of use. They can be spread out quickly, making them a convenient option for flooring projects. Whether you’re a professional contractor or a DIY homeowner, overlay moisture barriers can be an effective choice for protecting your flooring from excess moisture.

Roll-on moisture barriers are another option for protecting your flooring from excess moisture. These barriers are applied to the subfloor as a liquid or semi-liquid and are often used over concrete to prevent moisture from wicking into the flooring. Roll-on moisture barriers are available in two types: one-part and two-part products. One-part barriers can be applied without the need for mixing with a catalyst or hardener, while two-part barriers require the use of a catalyst for proper application. The two-part roll-on moisture barriers are generally considered more effective at protecting against moisture, but they can be more wasteful as any leftover product will harden and become unusable. When choosing a roll-on moisture barrier, consider the specific needs of your project and the potential pros and cons of each type of product.