2013 CBC Chapter 11B. I have been asked questions numerous times about "acceptable construction tolerances".
11B-104.1 Dimensions. Dimensions that are not stated as "maximum" or "minimum" are absolute.
11B-104.1.1. Construction and manufacturing tolerances. All dimensions are subject to conventional industry tolerances except where the requirement is stated as a range with specific minimum and maximum end points.
Once again this is not the type of language that is completely clear. It is pretty easy to understand that the current dimensional requirement for the location of a WC is 17" minimum to 18" maximum. This allows a 1" tolerance between the two stated dimensions and nothing above or below that range should be accepted.
The confusion comes into play when dimensions are specified as a single number and not a range. For example, the lavatory height is specified to be 34" AFF "maximum". In this case there is no "stated range with specific minimum and maximum end points" There is just a single number specified as a "maximum". Same thing with the width of an accessible toilet stall. 60" wide "minimum". It has always been my position that in these instances that the other number was implied and I would not accept a number either above a "maximum" or below a "minimum". So in the case of the toilet stall I assumed that the minimum 60" was the bottom of the range and the maximum was infinity, or as large as you wanted to make it. In the case of the lavatory it would be 34" maximum on the upper end of the range and 0" as the minimum (in concept) quite possibly there would be a roll under dim of 29" that would determine the true range minimum.
The very first scoping and technical requirement regarding dimensions does not seem to back this up. 11B-104.1 Dimensions. Dimensions that are not stated as "maximum" or "minimum" are absolute. That would leave me to believe that the dimensions that ARE stated with a "maximum" or "minimum" are not ABSOLUTE, and would be subject to some kind of dimensional tolerance.
What do you all think? Is it only dimensions that are specifically specified as a range with both a minimum and maximum end point that are not subject to some sort of construction tolerance?
If that is the case what is an acceptable construction tolerance for the height of a lavatory? the width of a toilet stall? the height of a dispenser?
11B-104.1 Dimensions. Dimensions that are not stated as "maximum" or "minimum" are absolute.
11B-104.1.1. Construction and manufacturing tolerances. All dimensions are subject to conventional industry tolerances except where the requirement is stated as a range with specific minimum and maximum end points.
Once again this is not the type of language that is completely clear. It is pretty easy to understand that the current dimensional requirement for the location of a WC is 17" minimum to 18" maximum. This allows a 1" tolerance between the two stated dimensions and nothing above or below that range should be accepted.
The confusion comes into play when dimensions are specified as a single number and not a range. For example, the lavatory height is specified to be 34" AFF "maximum". In this case there is no "stated range with specific minimum and maximum end points" There is just a single number specified as a "maximum". Same thing with the width of an accessible toilet stall. 60" wide "minimum". It has always been my position that in these instances that the other number was implied and I would not accept a number either above a "maximum" or below a "minimum". So in the case of the toilet stall I assumed that the minimum 60" was the bottom of the range and the maximum was infinity, or as large as you wanted to make it. In the case of the lavatory it would be 34" maximum on the upper end of the range and 0" as the minimum (in concept) quite possibly there would be a roll under dim of 29" that would determine the true range minimum.
The very first scoping and technical requirement regarding dimensions does not seem to back this up. 11B-104.1 Dimensions. Dimensions that are not stated as "maximum" or "minimum" are absolute. That would leave me to believe that the dimensions that ARE stated with a "maximum" or "minimum" are not ABSOLUTE, and would be subject to some kind of dimensional tolerance.
What do you all think? Is it only dimensions that are specifically specified as a range with both a minimum and maximum end point that are not subject to some sort of construction tolerance?
If that is the case what is an acceptable construction tolerance for the height of a lavatory? the width of a toilet stall? the height of a dispenser?