Yes, you can install laminate flooring directly over concrete subfloors, although this is not advisable.
This is because concrete is a highly porous material which tends to absorb moisture which will damage the directly exposed laminate planks.
Concrete is porous and can retain moisture, which then results to mold, mildew, or severe damage to the laminate flooring
The primary reason why you might want to install laminate directly over concrete is maybe because you do not have the funds to acquire underlayment and moisture barriers.
Another reason would be when using a commercial rental where you are installing the flooring yourself.
Whatever the reason, experts recommend that you use underlayment between the laminate floor and concrete subfloor, rather than doing a direct installation.
Nevertheless, if you still have to install laminate directly over concrete, follow these steps:
How to install laminate flooring directly over concrete
Step 1: Addressing uneven surfaces and patching the concrete subfloor:
Before the laminate installation, it is essential to address any uneven surfaces or cracks in the concrete subfloor.
- Uneven areas can cause the laminate flooring to become unstable or produce noticeable height variations.
- Inspect the subfloor for cracks, gaps, or other imperfections and fill them with a suitable patching compound or concrete filler.
- Follow the manufacturer’s instructions for the chosen product and ensure that it is specifically designed for use on concrete subfloors.
- Allow the patching compound to dry and cure completely before proceeding with the installation.
By addressing uneven surfaces and patching the subfloor, you create a solid and uniform foundation for the laminate flooring, minimizing the risk of future issues and enhancing the overall quality of the installation.
Related: Should you walk over laminate flooring immediately after installation?
Step 2: Leveling the subfloor:
- To ensure a smooth and even surface for laminate flooring installation, it is important to level the concrete subfloor.
- Use a long straightedge or a level to identify any low or high spots on the floor.
- Low spots can be filled with a self-leveling compound, while high spots may require grinding or sanding.
- Follow the manufacturer’s instructions when using a self-leveling compound and allow sufficient drying time before moving forward.
- Taking the time to level the subfloor will prevent unevenness and potential damage to the laminate flooring, ensuring a professional and aesthetically pleasing result.
Step 3: Addressing moisture issues:
- Concrete is porous and can retain moisture, which can lead to problems such as mold, mildew, peeling, and other damages to the laminate flooring.
- It is vital to assess the moisture level of the concrete subfloor before installation.
- Perform a moisture test by taping a plastic sheet securely to the concrete floor for 24 to 48 hours.
- If condensation or moisture droplets form on the underside of the plastic or if the concrete appears damp, it indicates high moisture levels.
- In such cases, it is necessary to address the moisture issue before proceeding with the installation.
- Consider using a moisture barrier, applying a concrete sealer, or consulting with a professional to mitigate moisture problems.
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Step 4. Cleaning the subfloor:
- Before installing laminate flooring directly on a concrete subfloor, it is crucial to ensure that the surface is clean and free of any debris.
- Begin by removing all furniture, rugs, and loose objects from the area.
- Sweep or vacuum the floor to eliminate dust, dirt, and loose particles.
- For stubborn stains or adhesive residues, you may need to use a mild cleanser or adhesive remover specifically designed for concrete floors.
- Thoroughly rinse the floor with clean water and allow it to dry completely before proceeding to the next steps.
Read our comprehensive guide on how to prepare concrete subfloor for laminate flooring.
Why experts recommend a moisture barrier before installing laminate over concrete.
Experts recommend using a moisture barrier before installing laminate flooring over a concrete subfloor for several important reasons:
1.Protection against moisture:
Concrete is porous and can absorb moisture from the ground or surrounding areas.
If moisture is allowed to seep into the laminate flooring, it can lead to warping, swelling, peeling, or cupping of the planks.
A moisture barrier acts as a protective layer, preventing moisture from reaching the laminate flooring and causing damage.
2.Moisture mitigation:
Even if the concrete subfloor appears dry, there may still be moisture present in the form of vapor.
You need to conduct a moisture test to determine the level of allowable moisture content in your subfloor.
Moisture vapor can gradually permeate through the concrete and accumulate underneath the laminate flooring.
A moisture barrier, typically made of plastic or specialized underlayment with a moisture-resistant layer, acts as a barrier to reduce the transmission of moisture vapor.
It helps prevent excessive moisture from affecting the laminate flooring, reducing the risk of problems such as mold or mildew growth.
3.Longevity of the flooring:
Moisture-related issues can significantly impact the longevity and performance of laminate flooring.
Excessive moisture can cause the planks to warp, swell, or delaminate over time, leading to the need for premature replacement.
By installing a moisture barrier, you provide an additional layer of protection that helps maintain the integrity and durability of the laminate flooring, ensuring its longevity and minimizing the need for repairs or replacement.
4.Warranty requirements:
Many laminate flooring manufacturers require the use of a moisture barrier or underlayment with moisture barrier properties to maintain the warranty.
Failing to use a moisture barrier as recommended may void the warranty, leaving you responsible for any potential issues or damages.
Conclusion
While you can install laminate flooring directly over concrete, it is not advisable to do so.
Note that most manufacturers of laminate flooring require that you have a moisture barrier and underlayment between the laminate floor and concrete subfloor.
Failure to do this, results to voiding of your warranty. Should your laminate flooring get damaged by moisture, you will have to incur the costs alone.
For this reason, we would advise you to ensure that before laying the laminate planks over laminate, you carry out moisture testing, use a moisture barrier and/or underlayment.
It is also important to note that a moisture barrier should be installed according to the manufacturer’s instructions and specific product recommendations.
Proper moisture management through the use of a moisture barrier helps safeguard your investment in laminate flooring, providing a stable and long-lasting flooring solution.
