Your flooring expert will ask you if the concrete slab is above, at or below grade. It simply means above the ground, at ground level or below ground, or the basement. The reason the contractor or seller will ask is that most hardwood floor manufacturers do not recommend installing their floors below grade. Easiklip is the only manufacturer who will still honor the warranty if properly installed below grade.
It takes 6 to 8 weeks for concrete to cure, depending on climate and the concrete mixture. During the curing process, there is excess moisture still evaporating from the concrete that can ruin the floor if you install it too early.
This leads us to another significant consideration for laying hardwood floor in basement over concrete. Even old slabs will continuously wick moisture up from the ground. If your home is prone to dampness, or the foundation does not drain properly, water will come through the slab or the walls into your basement.
Do you run a dehumidifier most of the time? You have too much moisture in the area to install hardwood. Consider asking a specialist in basement waterproofing to solve that issue before installing any new floor.
We caution against the Plastic Sheet Method for testing moisture levels in your concrete slab. This method requires you taping a inch square piece of clear plastic, at least 6 mils thick to the floor.
Lay the section on the concrete slab and use moisture-resistant tape to tape all four sides to the floor. You do this in three to four areas around the slab. Leave it for 24 to 48 hours.
If you see signs of moisture or condensation on any of the plastic, you likely have a problem, but you can never be sure how big, or what it is, or exactly how much moisture there is. The calcium chloride test measures the surface moisture of the slab. You can see the kit and how it works in this video.
Humidity sensors or moisture meters require drilling holes and inserting probes to measure the amount of water. Some meters measure results in pounds of water per 1, square feet of the floor during a hour period.
Other meters can measure relative humidity in the slab. One very accurate testing method is to use the Wagner Rapid R. Most flooring manufacturers say you should not install hardwood over concrete if the tests show the moisture emission rate is over 3 pounds. When installing hardwood flooring on basement , the concrete must be flat so the tongue and grooves of the hardwood meet and connect.
Old basement slabs can crack and buckle in places. You need to fill any large cracks and be sure that the entire floor is level. That means pouring a thin layer of cement to fill in dips and gaps. Here is a short video to show you how to level a concrete floor.
To check the evenness of the slab, use a 6-foot or longer straight edge. You may have to cut one utilizing a table saw to ensure straightness. Lay the straight board on the floor and place a level on top.
Concrete is very porous like a sponge. Water can quickly pass through it causing moisture problems, especially below grade. Typically, it is sheets of plastic laid on the slab and taped at the seams with waterproof tape. Watch this video to see how easy it is:. He adds an optional underlayment on top of the moisture barrier for sound reduction.
There are other moisture barrier options. Ask your flooring professional what he or she uses. A subfloor is the floor surface directly under the hardwood floor. In this case, the subfloor is the concrete slab. Wood needs to move as the humidity increases and decreases throughout the year.
For these reasons, you should avoid gluing, nailing or permanently attaching directly to the slab. It adds a lot of extra time and effort. It lays directly on top of the waterproof barrier, or combination of barrier and underlayment, to help cushion and insulate.
Be aware of the additional height that the subfloor and underlayment add. They can add up to two inches in a basement that may already have a low ceiling. There are many options for building a plywood or OSB subfloor. The materials appearing on The Carpet Guys's web site could include technical, typographical, or photographic errors. The Carpet Guys does not warrant that any of the materials on its web site are accurate, complete, or current.
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Wood floors on concrete slab foundation. Best method for basement installations as well as homes, condos, or apartments.
In this video, he offers a few tips for selecting and installing a hardwood floor in slab on grade conditions. How do you install hardwood floors on concrete slab? Installing wood flooring over your slab foundation can be a great idea as long as the slab is properly prepared, and the floor is installed by a professional. Your concrete floor or slab must be flat.
Wood floor finishes pin by harbour hardwood floors on wood floors pinterest. Installing hardwood floors over concrete. The next step is to nail the hardwood flooring down. Care must be taken not to puncture this layer, as that would allow moisture to reach the hardwood flooring. Spotted gum timber flooring permanently installed over a concrete slab this is a genuine solid 19mm thick australian hardwoo flooring timber flooring hardwood. But if the main level of your home has a concrete floor, you have a slab foundation.
Glue down engineered hardwood flooring to concrete slab above and below grade. When installing hardwood flooring on basement, the concrete must be flat so the tongue and grooves of the hardwood meet and connect. An exception to this may be if you are gluing or nailing with a glue assist since you would typically glue directly to the subfloor.
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