Question on Concrete roof span 1

You won't find prescriptive span tables for something like that. You'll need a structural engineer to design it for the loads, based on the support conditions and the geometric limitations (max thickness of the slab, etc.). If the work is being done under a building permit, you'll need a stamped design from a PE, anyway.

Any reason you want to put a limit on the size of the reinforcing, and the depth of the metal decking? You could be adding expense to the project unnecessarily, especially if you impose both of those limitations. smaller reinforcing means a greater slab thickness, which will require thicker or deeper metal decking.

You get preformed concrete plates that you drop in by crane.

They can be hollow.

Where I am they go to 6 meter lengths.

Way easier and cheaper than pouring on site.

They come with data sheets for loading.


For example

Stat clear of aerated concrete roofs there is loads of problems with them.

If you want to count metal decking as part of the concrete reinforcement, it needs to be continuous across the span, Search for "Composite metal floor decks".

However The usual practice is to span between support beams which makes the span rather short.


Typically data sheets with span tables are available, along with typical assembly details. An example is here. The table for roof decking has values to 12 feet. I suspect this decking is not available for longer spans.