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I'm undertaking a scheme design just now for an office block. I've come up with a scheme of spanning 300mm hollowcore unit 12m between primary steel beams spanning 6m. The loading is office catergory 4 kN/m2 with finishes of 1.5 kN/m2 I was not intending on putting a screed on the units, with the precamber taken up by raised floor. What precamber would you expect in a 300mm unit spanning 12m. Also, what frequency does the 12m spanning unit give?

from load/span given. anticipated camber 80.0mm (+tol) unit wll move down 40.0mm when laid on bearing. with no finish, please note allowed tolerance for unit camber and thickness. natural frequency 3.8hz.

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