FAQs

»  How far can I span without a beam?
»  What design load do I need for my building?
»  What thickness of Spancrete® hollow core plank do I need?
»  Where can I cut holes in my Spancrete® hollow core plank?
»  How do I cut holes in my Spancrete® hollow core plank?
»  How do I anchor to the underside of my Spancrete hollow core plank?
»  How do I support my Spancrete® hollow core plank?
»  How do I connect to a block/concrete masonry unit (CMU) wall?
»  How do I connect to steel?
»  Where do I find connection details?
»  Can I put a wall or column on my Spancrete® hollow core plank?
»  Do I need to fill the core ends?
»  How can I finish the underside of my Spancrete® hollow core plank?
»  How do I finish off the top of my Spancrete® hollow core plank?
»  What is the specification for structural topping?
»  How much would Spancrete® hollow core plank cost for my project?
»  In what sizes is Spancrete® hollow core Plank offered?
»  What is prestessed concrete?
»  Have a question that's not answered here? Contact Us.



»   What is the specification for structural topping?

Where structural topping is required, a minimum 2" concrete topping must be bonded to the plank. Because the structural topping provides load capacity, it is imperative that the topping be of specified strength completely bonded to the plank uninterrupted by control joints or conduit. Topping must be designed for 28-day strength of 4,000 pounds per square inch (psi). When placing concrete topping, precautions must be taken to thoroughly clean and wet the plank’s top surface. Topping must be properly cured before continuing work on the surface.

It is further recommended that wire mesh be used in the concrete topping, with the mesh size to be determined by the architect/engineer. It should be noted that the 2" minimum thickness topping is measured at mid-span (high point of camber) and therefore, additional concrete may be required at the perimeter to level the floor. All non-load bearing walls (CMU, Steel Stud or Wood Partitions) must be installed AFTER the concrete topping is placed and ON TOP OF the structural topping.

SMA Research Notes (stored as PDFs):

1019: Concentrated Loads on Topped Spancrete Decks
1020: Load Distribution

Span Notes (stored as PDFs):

Topping off your Prestressed hollow core floor


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