When installing hardwood floors, managing moisture is essential to avoid costly repairs down the line. For hardwood flooring contractors, choosing the right moisture barrier solution for the job is crucial. Here’s a detailed breakdown of key points to consider.
Start with Moisture Testing
Moisture testing is the first and most critical step before any hardwood installation on a concrete slab. Concrete naturally retains moisture, and if it releases too much water vapor, it can severely impact the stability of the wood flooring above. Using RH probes, such as those that come with the Wagner Rapid RH system, provides an accurate measurement of the slab’s relative humidity, offering a reliable starting point. Wagner Rapid RH probes are engineered for precise, in-situ testing following ASTM standard 2173, which sets the benchmark for understanding moisture conditions within the slab. This standard requires measurements taken at specific depths within the concrete to reflect its internal moisture levels, helping contractors determine if the substrate is suitable for hardwood installation or if moisture control products are needed.
Understanding these moisture readings is essential for contractors. The results will tell you whether the conditions meet the adhesive’s specifications or if an additional moisture barrier should be applied. Each adhesive has a maximum RH tolerance level, beyond which a moisture barrier is necessary to protect the floor. Skipping this testing step can lead to significant issues later, as excessive moisture can cause wood floors to warp, buckle, or develop mold. These issues not only lead to high repair costs but can also harm the contractor’s reputation. So, by investing in thorough testing at the beginning, contractors can ensure long-term success and peace of mind for their clients.
Choosing the Right Moisture Barrier
In cases where the slab’s moisture levels exceed safe thresholds, a dedicated moisture vapor barrier is necessary to shield the wood from moisture damage. Traditionally, contractors would use polyethylene film to serve as a barrier, but today’s roll-on or coating barriers offer a more efficient solution. Roll-on barriers, in particular, are simple to apply and highly effective. If your installation is on a below-grade concrete slab or in a new construction setting where moisture levels are higher, these modern barriers provide a solid defense against moisture ingress, offering much-needed protection to the wood flooring.
Selecting the right barrier product requires attention to both the slab’s moisture levels and the environmental conditions of the space. Roll-on barriers form a continuous, impenetrable layer over the substrate, effectively blocking moisture from reaching the wood. Coating-based moisture barriers may also be an option, providing a similar level of protection but with greater flexibility in terms of thickness and application. City Floor Supply recommends that contractors always consult the product specifications to choose a barrier compatible with the job’s specific requirements. This proactive approach can prevent expensive callbacks due to moisture-related issues, protecting both the flooring and the contractor’s reputation.
Adhesives with Dual Functions
When dealing with higher moisture conditions, some adhesives are designed to serve as both a glue and a moisture barrier, streamlining the installation process. Products like Bostik GreenForce are ideal for such situations, as they bond the wood flooring securely to the substrate while also providing moisture protection if applied correctly. These dual-function adhesives require the right trowel size and application technique to ensure they act effectively as a moisture barrier. It’s essential to follow each product’s technical data sheet to confirm that the adhesive will provide adequate moisture protection at the applied thickness and spread rate. Failing to meet these specifications may result in a failed barrier, leaving the floor vulnerable to moisture damage.
Applying a dual-function adhesive provides benefits for the installer and the client, as it reduces the need for multiple layers of materials and streamlines the overall process. However, it’s vital to check the product’s RH limit to ensure it aligns with the job’s specific moisture conditions. If the RH levels exceed the adhesive’s tolerance, a separate roll-on barrier should be used first. Taking the time to understand each adhesive’s properties can help avoid performance issues, ensuring that the adhesive performs as both a bonding agent and a moisture barrier to protect the floor.
Product Selection Tips
For optimal results, contractors are encouraged to stick within a single manufacturer’s product line when selecting moisture barriers and adhesives. Manufacturers design these products to work together, enhancing compatibility and ensuring that each component performs to its fullest potential. For example, using Bona R540 with R851 adhesive creates a system that is specifically engineered to withstand high moisture conditions and secure the wood flooring in place. Mixing and matching products from different manufacturers can lead to compatibility issues, which might reduce the moisture barrier’s effectiveness and compromise the installation.
Consistency in product selection reduces the chance of application errors and simplifies troubleshooting if issues arise. Each manufacturer offers detailed guidance and instructions for their products, so sticking to one brand’s system streamlines the installation process and helps contractors avoid pitfalls. Many brands, like those carried by City Floor Supply, also provide a variety of trowel size options and product guides, making it easy to find the best solution for each job’s specific needs. Following the manufacturer’s guidelines ensures a successful installation and prevents costly repairs or replacements caused by inadequate moisture protection.
Access Resources and Support
City Floor Supply offers valuable resources on each product they carry, making it easy for contractors to access the information needed for a successful installation. The City Floor Supply website includes product pages with technical specifications, trowel size recommendations, and application videos for moisture barriers and adhesives. These resources guide contractors through each step, ensuring they follow best practices for moisture control and proper application. For products like GreenForce or the Bona line, these resources can be especially helpful in explaining the unique requirements and application techniques necessary to use the products as moisture barriers.
In addition to online resources, City Floor Supply provides customer support to assist with any questions contractors may have during the installation process. Their team of experts can offer guidance on choosing the right moisture barrier and adhesive combination for specific job conditions, saving contractors time and reducing the risk of errors. For assistance, contractors can reach City Floor Supply at 800-737-1786. This dedication to support ensures contractors have access to the knowledge and tools they need, giving them confidence in their installations and helping to protect their reputation in the field.
