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Insulating a Basement Floor with PlastiSpan Insulation

November 6, 2012

Written by Melissa Carruthers
Follow her on Twitter @MelissaC_PFB

The Plasti-Fab Solutions home has had all sorts of insulation solutions completed to date, from the foundation walls, to the exterior above grade walls, the first floor system and more.

So let’s say you choose not to go with the radiant floor application discussed last week, there are other options to insulate your floors. Follow along to see how to warm up that basement.

As in the previous blogs, you know that you can use various products in this application including PlastiSpan Insulation, DuroFoam Insulation, and PlastiSpan HD Insulation. We will be using PlastiSpan Insulation to insulate our basement floor.  If you need a refresher on the differences between the products, visit

You too, can 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 our Plasti-Fab Solutions 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.

Next week we begin moving into the final stages of the insulating applications of our Solutions Home. Stay tuned for Dave’s blog on the energy efficiency of SIP roofs.

One Comment leave one →
  1. May 2, 2013 12:39 pm

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