Floor Level Tolerances

Tolerances provide a way for the structure s designer to let the contractor know what is expected to define the acceptable level of imperfection since it is understood that no structure is exactly level plumb straight and true.

Floor level tolerances. A floor is classified as free movement if it can be driven around freely by vehicles such as forklifts without too many obstacles such as columns or walls. The higher the f number the flatter or more level the floor. Tolerances according to the commentary to aci 117 are a means to establish permissible variation in dimension and location giving both the designer and the contractor limits within which the work is to be performed.

Specific use of a tolerance item may warrant less or more stringent tolerances than contained in the. Tolerances when tiles 8 x 8 or larger had been selected. Then the steel fabricator is given a camber tolerance range of 0 3 8 inch so the floor system is not overcambered.

Class a finish 1 8 inch below a 10 foot 23 straightedge class a 2 finish 3 16 inch below a 10 foot 24 straightedge class b finish 1 4 inch below a 10 foot 25. For many internal ground floors the most suitable tolerances to be worked to are free movement classifications fm as defined in tr34 by the concrete society. For large format tiles with one.

This combination of under specifying camber and limiting overcamber prevents issues with minimum slab thickness. 1 1 2 the indicated tolerances govern unless other wise specified. Localized variations in level should not exceed 3mm from the mean when measured over a 2 m distance using a straightedge remedial measures in case of non compliance for toppings like ceramic flooring and natural stone the most feasible option would be localised grinding or application of smoothing compounds.

Floor flatness levelnessone of the things that distinguishes a high tolerance floor is its f number requirement. Higher flnumbers indicate a more level floor and the numbers are linear so a flof 50 is twice as level as an flof 25. Tolerances for concrete construction 117 7 1 1 scope 1 1 1 this specification desig nates standard tolerances for concrete construction.

Elevation differences are measured every 10 feet within 72 hours after the concrete is placed and those measurements are entered into a calculation to determine floor levelness fl. The new tolerances being sug gested by the committee are for the maximum depressions between high spots in a floor or slab for four classes of finish. Tolerance values affect construction cost.