Does CBC 11B-606.6 widen the entire required clear floor space for a lav?

[nealderidder]

A 30 x 48 clear floor space is required for a lav per 11B-606.2. If you center that 30" on the lav you need 15" clear to either side of the lav center. There is a CA amendment to this section (11B-606.6) that requires 18" from lav center to a sidewall. So is my required clear floor space effectively 36 x 48? Or maybe 18" on the wall side and 15" on the open side? To illustrate the point - the attached shows a lav with 30 X 48 clear space that is also 18" + from lav to sidewall. But is the paper towel (P.T.) dispenser allowed where shown or is it encroaching on the lav clear floor space?

 

[arwat23]

The clear floor space is still 30"x48" centered on the fixture. The 18" off the side wall doesn't change this.

The PT dispenser can be within the 18" off the side wall (11B-606.6 does not say this 18" off the side wall is "clear" space). The dispenser cannot be within the 30"x48" clear floor space required by 11B-606.2.

Your diagram is compliant with CBC.

 

[nealderidder]

The clear floor space is still 30"x48" centered on the fixture. The 18" off the side wall doesn't change this.

The PT dispenser can be within the 18" off the side wall (11B-606.6 does not say this 18" off the side wall is "clear" space). The dispenser cannot be within the 30"x48" clear floor space required by 11B-606.2.

Your diagram is compliant with CBC.

That was my conclusion too but it's an odd little combination of requirements! Thanks for your reply.

 

[Yikes]

Interestingly, there is nothing in CBC 11B-606.2 or in 305 or 306 that says the 30" clear floor or ground space at a lavatory must be centered on the fixture.

And 11B-606.6 does not measure from the side wall to centerline of clear floor space. It only says that the center of a lav fixture must be min. 18" away from a side wall or other partition; 606.6 makes no reference to the width of the clear floor space underneath the lav at all.

In other words, the special requirement in 11B-606.6. does NOT compel a floor space wider than 30" when there's a wall or partition on only one side.
It only compels shifting the center of the lav fixture, resulting in an offset within that minimum 30" wide clear floor space.

So in theory, you could have 18" from wall to CL lav, then only 12" from CL lav to a side post or other type of non-wall, non-partition obstruction, as long as it doesn't form an alcove >24" deep (305.7.1)

If you have walls or partitions on both sides, then then yes per 11B-606.2 the minimum clear floor space effectively jumps from 30" wide to 36" wide.
Or if you have other obstructions that form a >24" deep alcove, then per 11B-305.7.1 the minimum clear floor space effectively jumps from 30" wide to 36" wide.