Keep the Cold Out Part I: How to Insulate your Basement Floor

As we inch closer to the winter months, thoughts of comfort and heating bills are more prevalent than ever. What IS the best way to keep your warm air in, providing a comfortable environment for everyone without breaking the bank? Consider insulating your basement for added comfort and energy savings.

Take a look at your basement space – You have two areas where you can improve your energy efficiency with EPS rigid insulation, immediately affecting the comfort of the room for the better – the floor and the walls. While Plasti-Fab has a variety of insulation solutions for these applications, today we will talk about the use of PlastiSpan Insulation. (To see other insulation solutions visit: and

Now on to insulating the floor….
Follow these simple how-to steps to install your PlastiSpan Insulation to have an insulated subfloor in place and be ready to install your final floor finishing such as carpeting, tiles or linoleum.  Follow along with us as we insulate above the slab of your home….

Before you do anything, be sure to reference the building code requirements applicable in your region. Usually you will need to install a moisture barrier, cover the entire floor area with 6-mil poly.  Do this to eliminate any moisture migration. (HINT* To limit the cutting of PlastiSpan insulation plan your area to include 2×2 strapping across the floor in one direction.)

Following the installation of the moisture barrier, you will then attach perimeter nailers around the space. Use a nailer that is the same thickness as the insulation. Attach the nailers around the perimeter using self-tapping concrete screws penetrating the concrete as per the screw manufacturer’s recommendations. Now to install the PlastiSpan insulation. Cut the first row of insulation to a 21-3/4″ width. Cut subsequent rows to 22-1/2″ widths. Use the insulation cut as guides to place successive rows of nailers at 24″ on center. Continue on to the opposite wall.

Now that you have insulated the floor with PlastiSpan insulation, you can prepare to lay the subfloor. Make sure you use an appropriate subfloor material that will support the span. Check with your building supply dealer before you purchase it. It’s easier if you snap chalk lines across where the strapping is to ensure the subfloor material is placed squarely. It’s time to secure the subfloor. Be sure to stagger the subfloor joints for extra stability. (HINT *Rent an automatic nailer, screw gun or automatic screw gun it makes life easier). Secure your subfloor by adding adhesive to the strapping (Use PL300), then fasten the 5/8″subfloor directly to the nailers as per the subfloor manufacturer recommendations.

Alright now your basement is properly insulated and ready to use. You are ready for your finished floor. You will notice right away that the finished floor is more comfortable. You have created a space your family will want to spend time in, without 2 pairs of socks on their feet.

Check back with us tomorrow  for Part Two: How to Insulate your Basement Walls…

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