I have a unusual question regarding the minimum thickness of concrete above the profile of a steel composite deck within a localized area (see attached sketch). I have a exterior balcony that spans approximately 6'-8" (simply supported). We are using 3" composite steel deck and 2" concrete (above the deck) for a total balcony floor of 5" (note, the thickness of concrete at the end of the balcony is more like 1.5" with the desired slope. The contractor wants to install a continuous low profile drain in the balcony floor near the support where the concrete is more like 1.5" deep. The continuous drain will running perpendicular to the deck flutes. The drain pan is 13/16" deep and 2.5" wide (the flanges of the drain are 1" each side for a total width of 4.5", see sketch). The thickness of concrete directly under the drain pan will only be 3/4" thick above the top flutes of the composite steel deck. Not sure this is a good idea but the client is pushing hard for this drain. The unfactored dead and live load on the balcony is minimal (less than 100 psf) and if the deck was 5" thick would be adequate for a load of 375 psf. (3" deck was utilized for architectural reasons, that why it is so over designed). The drain is located very close to the support as shown (3") and I am sure I can determine that the shear strength of the steel deck will take the load without any concrete. Just worried about the vibration deflection and weak spot this drain may cause. Comments?
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