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A Step-by-Step Guide to Using DuroSpan™ to Insulate your Basement Floor

March 17, 2016

As the weather begins to turn towards spring, many get the urge to begin home renovations. One of the easiest ways to make a space usable is to insulate it. So today, we are going to discuss how to insulate your basement floor with a laminated EPS product called DuroSpan. DuroSpan (also known as DuroFoam in Canada) has a green film laminated to the top of the rigid foam board, and a silver film laminated to the bottom. The laminated faces enable the board to be curled, bent, twisted, and cut without breaking or chipping. Your work space is cleaner and your project is finished in a short amount of time!

3D RenderingNow for some basics on what DuroSpan is.  DuroSpan is a closed cell EPS (Expanded Polystyrene) insulation, sold in 4×8 foot sheets. DuroSpan is suitable and recommended as the insulation component in the topic of our discussion: basement floors. Below is a step by step guide on how to insulate your basement floor above the slab to create a comfortable, usable space.

STEP 1: Be sure to follow the building code requirements applicable in your region. 

STEP 2: Install a Moisture Barrier – Cover the entire floor area with a 6-mil polyethylene moisture barrier to eliminate moisture migration into your living area. Plan your project to place your insulation and nailers at 24” on center across the floor in one direction.

STEP 3: Attach Perimeter Nailers – Attach nailer with the same thickness as the insulation, around the perimeter, using self-tapping concrete screws penetrating the concrete floor as recommended by the screw manufacturer.

STEP 4: Install Nailers and 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 centers. The green face of DuroSpan insulation should face up to make use of the markings for ease of cutting insulation spacing the nailers.

STEP 5: Prepare to Lay Sub-Floor – Mark the walls where the nailer centres intersect it to help locate the nailers when attaching the sub-floor. The sub-floor thickness should be 5/8”. Snap chalk lines across the nailers to ensure the sub floor material is placed squarely.

STEP 6: Secure the Sub-Floor -Be sure to stagger the floor sheathing joints for extra stability. Apply adhesive to the nailers. Fasten the 5/8” floor sheathing directly to the nailers using either ringed nails or deck screws every 8”. With an air nailer, use 2-inch ringed floor sheathing or screw nails. With a screw gun, use 1-1/2” or 1-3/4” deck screws.

STEP 7: Ready for Floor Finishing. – Your basement floor is now correctly insulated and ready for your final decorating touch. You should notice the finished floor is now much more comfortable.

family enjoyingAnd the most important step…. ENJOY your newly insulated and finished space!

For more information on Plasti-Fab’s DuroSpan insulation, visit: Plasti-Fab

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