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Load tables indicate what service loads can be achieved at different spans. The capacity of the Spancrete Hollowcore® plank is dependent on the topping applied to the plank. Toppings are frequently used in conjunction with plank systems for cosmetic and/or structural purposes. A structural topping is applied to the plank such that it bonds to the plank to form a composite unit to enhance the load capacity of the system. A non-structural topping is used to compensate for camber, create drainage, or provide a wearing surface. Non-structural toppings may or may not be bonded to the plank but in all cases do not contribute to the structural load capacity of the plank.
You want to install Spancrete Hollowcore® plank over a proposed 24-foot x 36-foot garage. It is assumed the plank will span the 24-foot direction. Whenever Spancrete Hollowcore® plank is exposed to the elements or wet environments, it is recommended that a waterproof membrane be installed over the plank system. This will keep the topping from bonding to the plank, as the topping is considered non-structural. A standard design load for a residential garage is 80 pounds per square foot (psf). A 2-inch concrete topping will add approximately 25 psf (or 12.5 pounds per inch of topping). The total superimposed load therefore is approximately 105 psf. A check of the chart labeled "Floor Without Structural Topping" indicates that a 24-foot span will require an 8-inch plank.
Again, the charts are meant to be a guide; contact your local Spancrete® sales representative to determine a recommended plank size for your application.
SMA Research Notes (stored as PDFs):
1016: Cantilever Load Distribution
1020: Load Distribution
1022: Span Limitations - Floor Vibrations - Heel Drop Response
1023: Span Limitations - Floor Vibrations - Flexible Supports
Span Notes (stored as PDFs):
How to Use Spancrete® for Inexpensive Space Under Your Garage
Building a New Home with Spancrete® is Easy
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