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SmartCore® SIF Pine Plywood

SmartCore® SIF Plywood is underlayment and ideal for residential and light commercial construction, and provides outstanding performance and durability to new homes, room additions, and remodeling.


Underlayment. Available Forest Stewardship Council® (FSC®) certified on request.


Available Sizes:

4’ X 8’ (width x length), nominal

Building Code Performance Categories, Panel Thicknesses*:

19/32 CAT, 0.578 IN. (14.68 mm), SPAN 20oc (SE or T&G-Net 47 1/2)

23/32 CAT, 0.703 IN. (17.86 mm), SPAN 24oc (SE or T&G-Net 47 1/2)

1 1/8 CAT, 1.091 IN. (27.71 mm), SPAN 48oc (SE or T&G-Net 47 1/2)


SIF (Sturd-I-Floor Underlayment)

Length/Width Tolerance: Length +0”, -1/16”; Width +0”, -1/16”
Straightness Tolerance: Within 1/16”
Squareness Tolerance: Within 1/8”
Primary Species: Southern yellow pine
Surface Treatments: Touch sanded
Testing Agency: APA® - The Engineered Wood Association (mil number 473)
Classifications: Exposure 1- Plywood suitable for uses not permanently exposed to the weather. Panels are intended to resist the effects of moisture on structural performance as may occur due to construction delays or other similar conditions.
Code Fire Classifications: Class III or C
Flame Spread Rating: 76-200; ASTM E 84
Building Code Compliance: PS1 PRP108