Floor Deflection Limits. ACIs recommendations address the amount of deflection subsequent to the installation of non-. If that same joist had gypsum ceiling L240 the allowable deflection is 06.
This means that your actual calculated deflection of the beam should not exceed either 1 inch or 067 inch depending on which of the criteria you are using. Allowable Deflection as an Expressed Ratio of the Clear Span. Now how does this relate to a single layer of plywood sub-floor.
The Tile Council of America recommends that deflection be limited to L360 L span length in inches under total load for ceramic tile.
The Marble Institute of America recommends that total load deflection be limited to L720 for spans up to 14-0 and a maximum deflection of 732 for spans greater than 14-0. So if you have a beam 20ft long the allowable deflection limit is 20ftx12inft 240 1 inch if using L240. The Marble Institute of America recommends that total load deflection be limited to L720 for spans up to 14-0 and a maximum deflection of 732 for spans greater than 14-0. The deflection of aluminum structural members shall not exceed that permitted by AA ADM1.
