DMX 1-Step 2.0 is an advanced underlayment designed for use in moisture-prone environments such as basements and humid climates. It provides a waterproof vapor barrier, thermal insulation, and sound dampening properties, making it ideal for a variety of flooring types, including vinyl plank, laminate, and engineered hardwood. This article provides a comprehensive guide to the installation of DMX 1-Step 2.0, based on official documentation and technical specifications.
Overview of DMX 1-Step 2.0 Features
DMX 1-Step 2.0 is a dimpled, closed-cell foam underlayment that functions as a vapor barrier and insulation layer. The product is engineered with a unique dimple pattern that allows air to circulate beneath the flooring, preventing moisture buildup and reducing the risk of mold and mildew growth. It is also VOC-free, ensuring no harmful emissions, and is compatible with a range of flooring materials.
Key technical specifications include:
- Compression Strength: 10,000 to 12,000 lbs per square foot
- R-Value: 3.5 per inch, contributing to thermal efficiency
- IIC (Impact Insulation Class): 72, indicating sound-dampening performance
- STC (Sound Transmission Class): 62, further supporting noise reduction
- Dimensions per Roll: 29 feet (8.8 meters) in length, 42 inches (1.07 meters) in width, covering 100 square feet (9.38 square meters) per roll
- Dimple Height: 5/32 inches (4 mm), facilitating airflow
- Warranty: 25-year manufacturer warranty
These features make DMX 1-Step 2.0 suitable for both DIY and professional installation projects, particularly in areas where moisture control and thermal comfort are critical.
Preparing the Subfloor for DMX 1-Step 2.0
Before installing DMX 1-Step 2.0, the subfloor must be properly prepared to ensure optimal performance. The subfloor should be clean, dry, and free of debris, dust, and excess moisture. Any existing imperfections or irregularities should be addressed, such as uneven surfaces or protruding nails, which could interfere with the underlayment and flooring installation.
For concrete subfloors, it is recommended to apply a moisture mitigation system if the relative humidity (RH) exceeds acceptable levels. This is particularly important in basements or other areas with a history of moisture issues. According to source material, some underlayment systems, such as Schönox SDG Plus, can be used in conjunction with DMX 1-Step 2.0 to manage residual moisture.
If installing over an OSB or plywood subfloor, ensure that the surface is structurally sound and free from damage. Pre-drilling for fasteners is recommended when securing OSB to concrete, and using Tap Con screws with polyurethane sealant is advised to maintain the vapor barrier’s integrity. This method helps prevent moisture from seeping through the screw holes and compromising the underlayment’s effectiveness.
Installing DMX 1-Step 2.0 on Concrete Subfloors
The installation process for DMX 1-Step 2.0 on concrete subfloors is designed to be straightforward and tool-free. The following steps outline the recommended procedure:
Unroll the Underlayment: Begin by unrolling the DMX 1-Step 2.0 roll across the subfloor, starting from one corner of the room. The product is flexible enough to conform to most floor surfaces, but care should be taken to avoid creases or folds that could trap moisture.
Trim as Needed: Use scissors or a utility knife to cut the underlayment to fit around obstacles such as columns, pipes, or HVAC ducts. It is important to ensure a snug fit to prevent gaps that could allow moisture to accumulate.
Leave an Air Gap Around the Perimeter: According to the manufacturer’s instructions, a small air gap should be left between the edge of the underlayment and the wall. This gap allows for vapor diffusion and helps prevent moisture from becoming trapped between the underlayment and the wall. However, some users have proposed sealing the perimeter with low-expansion spray foam, which could create a tighter barrier and potentially improve performance in certain climates.
Overlap and Secure Joints: When installing multiple rolls, overlap the edges by at least 6 inches and secure the seams using the included DMX Joining Tape. This ensures continuity of the vapor barrier and prevents gaps that could compromise the underlayment’s effectiveness.
Install Shims (if Required): If installing engineered hardwood or other flooring types that require an expansion gap, use the included DMX Easy Shims to create the necessary space along the perimeter. These shims should be made from non-wood materials such as plastic or fiberglass to maintain the desired height and prevent warping.
Proceed with Flooring Installation: Once the underlayment is in place, proceed with the installation of the chosen flooring material. For vinyl plank or laminate flooring, ensure that the thickness is at least 5mm, as thinner materials may require an additional OSB or plywood layer to prevent deflection and joint failure.
Installing DMX 1-Step 2.0 on OSB or Plywood Subfloors
When installing DMX 1-Step 2.0 over an OSB or plywood subfloor, additional considerations may be necessary depending on the type of flooring being used:
Floating Floors: For floating floors such as click-lock vinyl plank or laminate, the DMX 1-Step 2.0 can be installed directly over the OSB or plywood subfloor without the need for additional layers. The dimpled design allows for proper airflow and insulation, and the underlayment does not require a separate foam underlayment.
Nail-Down Floors: If installing solid hardwood or engineered hardwood that requires nailing into the subfloor, a 5/8" tongue-and-groove OSB or plywood layer should be installed over the DMX 1-Step 2.0. This provides a stable surface for securing the flooring and ensures proper adhesion. Adhesive should be applied to the OSB or plywood if necessary, but no adhesive is required for the underlayment itself.
Loose-Lay or Glue-Down LVP: For loose-lay or glue-down luxury vinyl tile (LVT), the OSB or plywood subfloor should be installed over the DMX 1-Step 2.0 before laying the final flooring. This helps prevent deflection and ensures a stable surface for the flooring to adhere to.
In all cases, it is important to follow the manufacturer’s recommendations for the specific flooring type to ensure compatibility and long-term performance.
Addressing Moisture Concerns During Installation
One of the key benefits of DMX 1-Step 2.0 is its ability to manage moisture and prevent mold growth. However, proper installation is critical to achieving this goal. The dimpled design allows air to circulate beneath the underlayment, which helps evaporate any trapped moisture and prevents the buildup of humidity that can lead to mold and mildew.
In basements or other areas with a history of moisture issues, it is recommended to seal any potential entry points for water, such as cracks in the concrete slab or gaps around pipes. Additionally, leaving an air gap between the underlayment and the wall, as specified by the manufacturer, can help facilitate vapor diffusion and reduce the risk of condensation forming between the underlayment and the wall.
Some users have raised concerns about sealing the perimeter of the underlayment with spray foam, as it may limit airflow and trap moisture. While this method may seem more in line with building science principles, the manufacturer recommends following their guidelines to ensure the product performs as intended. It is always a good idea to consult with a building professional or the manufacturer if there are any questions about the best approach for a specific project.
Thermal and Acoustic Benefits of DMX 1-Step 2.0
In addition to its moisture management capabilities, DMX 1-Step 2.0 offers significant thermal and acoustic benefits. The closed-cell foam provides insulation with an R-value of 3.5 per inch, making it an effective way to improve the comfort of floors in cooler environments. According to the manufacturer, the underlayment can increase the temperature of the floor by up to 12°F (6.5°C), which can make a noticeable difference in comfort, especially in basements or other areas where floors tend to feel cold.
The underlayment also contributes to sound dampening. With an IIC rating of 72 and an STC rating of 62, it helps reduce impact noise and airborne sound transmission between rooms. This is particularly beneficial in multi-story homes or apartment buildings where noise control is a concern.
Maintenance and Long-Term Performance
Once installed, DMX 1-Step 2.0 requires minimal maintenance. The closed-cell foam is resistant to mold, mildew, and pests, and the product is designed to last for decades with proper installation and care. The 25-year manufacturer warranty provides additional assurance of long-term performance.
To maintain the effectiveness of the underlayment, it is important to avoid puncturing or tearing the material during the installation of the final flooring. Any damage to the underlayment could compromise the vapor barrier and reduce its ability to manage moisture. If damage is discovered during or after installation, it should be repaired or replaced as needed.
Conclusion
DMX 1-Step 2.0 is a versatile and effective underlayment for a wide range of flooring applications, particularly in moisture-prone environments such as basements. Its advanced design, including a dimpled structure, closed-cell foam, and vapor barrier, helps prevent moisture buildup, reduce noise, and improve thermal comfort. With proper installation, the underlayment can provide years of reliable performance and contribute to the overall durability and comfort of the flooring system.
By following the manufacturer’s installation guidelines, users can ensure that DMX 1-Step 2.0 functions as intended and provides the full range of benefits, including moisture protection, insulation, and sound dampening. Whether used for residential or commercial projects, this underlayment is a valuable tool for achieving a high-performance flooring system.