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?
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»   How far can I span without a beam?

The PCI Design Handbook recommends limits on span-depth ratios for the hollowcore slabs. For roof slabs, a span-depth ratio limit of 50 is suggested. In practice, a span-depth ratio of 45 is common for floors and roofs where fire endurance, openings, or heavy or sustained live loads do not control a design.

Example: 10" Spancrete® roof with a span to depth ratio of 50

10" x 50 = 500 /N

500 = 41.67 FT or 41'–8"

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SMA Research Notes (stored as PDFs)

1021: Span Limitations - Floor Vibrations - Rhythmic Activity
1022: Span Limitations - Floor Vibrations - Heel Drop Response
1023: Span Limitations - Floor Vibrations - Flexible Supports


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