Published 7/30/09 4 months ago | Views 845 Grade C Home & Garden / Construction & Repair

Install a DRIcore Subfloor in Your Basement

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Last edited 2 months ago Flickr image by Jake Sutton

Undecided about the best way to cover and warm up the concrete floor in your basement? Air gap subfloor panels elevate and insulate your finished floor quickly and easily. A subfloor warms finished floors by 6°F (3.2°C) and provides protection from moisture. 2'x2'x7/8" panels press-fit together, requiring no nailing, gluing or fastening.

Step 1

Before finishing any basement project, check for moisture issues - leaks, excessive moisture, mold/musty spots, staining on concrete, bugs & spiders that thrive in damp areas, foundation cracks, window leaks, exterior drainage issues etc.

Step 2

Remove any existing flooring material that will trap, block or absorb moisture such as vinyl, carpet or wood flooring. If you have asbestos tile, see the Environmental Protection Agency website for details.

Step 3

Make repairs, fill cracks and seal concrete where necessary.

Step 4

For any low spots in the floor greater than 1/4", level with self-leveling liquid compound. This is most important if installing a wood floor finish.

Step 5

Determine the quantity of subfloor panels, leveling kits, and 1/4" spacer material for the project. For subfloor panel quantities, take the square footage of your room and divide by 3.3. This equals the number of subfloor panels required.

Step 6

Prepare tools and materials necessary to install the subfloor panels (see the "Things You'll Need" section below).

Step 7

Acclimatize the subfloor panels and wood flooring if applicable, to the temperature and humidity in the room where they will be installed.

Step 8

Sweep or vacuum floor to ensure a smooth surface.

Step 9

Install 1/4" temporary spacers along wall edges.

Step 10

Start at the longest wall and pre-measure the length and width of the floor area to ensure the last panel pieces in each row end are greater than 6" in width. Measure to include the ¼ spacer material. Adjust the starting panel of each row to accommodate for the end of row panel width.

Step 11

Cut panels and spacer material outside or in a well ventilated garage.

Step 12

Check your starting corner for squareness. If your starting corner is not at a 90-degree angle into the room, then the wall edge of your first row of panels will require cutting.

Step 13

In your starting corner, lay the first panel with the groove sides flat against the 1/4" spacer material.

Step 14

Slide the next panel against the starting panel by press-fitting the groove of the second panel into the tongue of the first panel tightly in place.

Step 15

Use a tapping block and hammer to ensure a snug fit. Repeat until the row is complete.

Step 16

Cut the last panel of the row to fit into place, allowing for the 1/4" gap. Use the pull bar to pull the last panel into place.

Step 17

Cut an opening the size of the inside measurements of the register cover into 1 panel every 10’ in panels that line exterior wall edges, to allow for airflow. Allow for 6?? away from the wall side edge of the panel to start this opening.

Step 18

Check each row for leveling and use leveling shims where required.

Step 19

Stagger panel seams of alternating rows by using off-cuts from previous rows as starting panels for these rows.

Step 20

Rows #1 and #3 look the same. Alternating rows #2 and #4 are staggered.

Step 21

Only work with 2 rows at a time. This will make adjusting panels or shimming for leveling easier.

Step 22

Continue to install panels, staggering seams until the room is completed. Leave 1/4" spacing for pipes, stairs or other affixed obstacles in the room.

Step 23

Finish with your choice of finished flooring including openings for the vent covers.

Step 24

Install vent covers in the openings along outside wall edges every 10'.

Step 25

Remove temporary spacers.

Tips

Installing an air gap subfloor with subfloor panels will help to control moisture from concrete floors that may contribute to mold formation.
Regulating humidity between 30-50% and room temperature at 71oF/20oC will help maintain warranty conditions and control moisture.
You can increase airflow to control moisture easily by increasing the space between subfloor panels and the wall edge. Running air duct vents down wall cavities to the floor level and forcing air underneath the air gap subfloor panels controls moisture.
Installing walls on top of the subfloor panels lifts the wall and floor away from damp concrete surfaces.
Only install finished flooring approved for basements.
If you get water - drill a 2.5 inch hole in center of panel at the lowest spot in installation using a plug cutter. Insert the 2.5 inch hose of a shop-vac into hole (apply tape (masking,duct) around tube end for tight seal)and vacuum water out. Re-insert plug when finished and remember/mark it's position.

Warnings

Wood floor finishes used in basements need acclimatization to the room where the installation is taking place. Floor failures may result.
Forgetting to level the concrete when installing wood floor finishes can result in cracking, popping or separation of the finished floor joints.
Forgetting to repair leaks and cracks can result in mold formation and potential flooding.