An Insulated Concrete Slab Floor will Keep Your Home Warmer and Lower your Home Heating Costs
By Mark J. Donovan
||Uninsulated concrete floors can be cold to walk on and make the living space uncomfortably cold.
If you have plans to finish a basement or your home sits on a cold concrete slab you may want to consider insulating the concrete floor.
Insulating a concrete slab floor can make a living space feel much more comfortable and can save on your home’s annual energy bills. The key process in insulating a concrete slab floor involves building a plywood subfloor over the concrete slab.
Besides making the living space warmer, a plywood subfloor is also the perfect surface for installing carpet or wood flooring. The subfloor provides a moisture barrier and a nailing surface for installing the carpet or wood floors.
Before installing a subfloor over the concrete slab it’s important to check for adequate headroom height. Building codes typically require 7 feet 6 inches of clearance between the finished floor and ceiling.
The typical subfloor has a height of 2-1/4” and a finished wood floor could add another ¾ inch. So from the concrete slab to the finished ceiling you need a minimum of 7 feet 9 inches of height to install a subfloor over the concrete slab.
After evaluating and repairing the concrete slab, vacuum it thoroughly and apply a concrete water sealer to its surface.
Next, cover the entire concrete slab with 6 mil thick polyethylene plastic. The plastic acts as a moisture barrier.
Make sure seams overlap by 6 inches and apply duct tape to the seams. Also, the plastic should extend up the perimeter walls by 6 inches and should also be sealed if possible with duct tape.
A grid of pressure treated 2×4 sleepers can then be installed over the concrete slab. The 2x4s should be placed on their flat sides. Learn more finishing basement floors here.
Measure carefully to ensure a snug, but not tight, fit. The goal is to leave no air gaps in between the sleepers while not compressing the insulation in the process.
After installing the insulation, place ¾ inch tongue and groove plywood over the network of sleepers. When installing the plywood start alternate rows with half sheets of plywood. This helps to lock in the plywood pieces and create a stronger subfloor surface. Fasten the plywood to the sleepers with 6d nails. Apply nails every 12 inches under the plywood panel centers and every 6 inches along the plywood panel seams.
With the subfloor installed and your concrete slab floor insulated you can then install your preferred finished flooring.
For help on finding a wood flooring installation contractor, see HomeAdditionPlus.com’s Wood Flooring Installation Bid Sheet. It will help ensure that you find and hire the right flooring installation contractor for your wood flooring project. In addition, it will help to ensure that your wood floor installation is completed on time and on budget.
- Should Hardwood Flooring go in before the Kitchen Cabinets?
- Checking Subfloor Moisture Levels before Installing Hardwood Floors
- Solid Wood Flooring versus Laminate Flooring
Additional Flooring Resources from Amazon.com
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