Concrete is a stable, convenient subfloor for laminate wood. But it's important to wait until the concrete is fully dry before installing your laminate. Floors that are still releasing moisture could cause serious damage to the finished floor. Learn how to tell when your concrete is ready to build on to prevent serious problems down the line.
A fully cured concrete floor isn't the same as one that's fully dry. Many people think that they can lay their laminate floors as soon as the cure time is up. While most 4-inch slabs take around 28 days to cure completely, they could release moisture for some time after this. Don't rely on a vapor barrier to keep water out of the flooring -- this material is meant to keep water from wicking up from the ground. Drying concrete may release more water than the vapor barrier can handle.
An improperly dried floor can seriously damage the laminate on top of it. Floors that are still releasing moisture can cause the wood laminate to warp and deform. They can also loosen glue and create mold issues under the laminate. Concrete is very alkaline, which tends to disrupt the adhesive action of many flooring glues, causing individual pieces to shift and pull up. Modern low-VOC adhesives are more sensitive to water and other adverse conditions than older materials, according to the National Ready Mixed Concrete Association.
Natural Drying Times
According to the Ready-Mix Concrete Association, concrete can take six weeks to a full year to dry enough to accept flooring. Concrete dries faster in warm, dry conditions but has a higher chance of cracking or shrinking. It may require occasional misting.
Accelerating Drying Times
Most homeowners aren't willing to wait a full year to install new flooring. To speed up drying, use dehumidifiers, fans and heaters. Measure the moisture in the slab, using a polyethylene sheet, commercial test strip or moisture meter before you install your flooring.
- Fill Large Expansion Joint in a Concrete Driveway
- What Is the Ideal Temperature for Staining Concrete?
- Why Does Concrete Buckle?
- Drainage Problems Around a House Built on a Hillside
- Seal New Concrete
- Paint Concrete Fireplaces
- Different Flooring Options Over Concrete
- Remove Wax From My Driveway
- How Can You Increase the Height of a Low Ceiling in a Basement?
- Seal Block Walls to Prevent Water
- How Do I Repair Stone Walls in the Basement?
- Types of Mortar for Cement Board