Gross & Net areas - what to do with unused area?

[PatrickGSR94]

Say you have a building with an Assembly Unconcentrated area (restaurant dining room, 15 SF/occ net) and a kitchen area (200 SF/occ gross). There are restrooms in that restaurant obviously, and other things like interior wall thickness and other things that would not contribute to the Net area calculation. However I don't think the restrooms would contribute to the Kitchen's area or occupant load, especially if they are primarily (or only) used by patrons and not employees.

I would like to have a table listing the building's occupied areas, with a total at the bottom for the overall occupant load of the building. I would also like the SF areas to add up to the total Gross Floor Area of the building, mainly because if I list the building's overall GFA on my Life Safety Sheet, and then have a table of spaces that don't add up to that GFA, plans examiners start to ask questions.

So in the example above, what do you do about those restrooms and other areas? Just list them in the table as "Unoccupied Area" or "Unused Area" or something else?

 

[cda]

You could also put the ol for each room/area actually on the plans.

I have seen that done

I do not think, unless critical that you have to account for every sq ft

 

[Mr. Inspector]

It depends if you are using gross or net floor area as defined in Chapter 10.

 

[mark handler]

Chapter 10 is for egress of spaces. If a space is not occupied or accessory less than 10 percent, generally not counted.

 

[PatrickGSR94]

We always list the building's total Gross Floor Area, defined as the area to the inside face of the exterior walls (which is more like the Net area from a BOMA standpoint) on the project code/life safety sheet. We also show a table of the spaces with areas used for occupant load calculations. I prefer to have the total on that table be the same as the overall building's Gross Floor Area.

 

[mark handler]

We always list the building's total Gross Floor Area, defined as the area to the inside face of the exterior walls (which is more like the Net area from a BOMA standpoint) on the project code/life safety sheet. We also show a table of the spaces with areas used for occupant load calculations. I prefer to have the total on that table be the same as the overall building's Gross Floor Area.

Yes but that has nothing to do with chapter ten and exiting or restroom count.

 

[steveray]

If you are using gross, everything gets accounted for; net, you get to pare some stuff out and I guess it might be a decent idea to classify what that is (walls, shafts, columns, unoccupied areas, etc...)

 

[ADAguy]

(+/-) Boma is concerned about rentable/(occupiable?) area. Code is concerned about total occupants relative to egress.
Is the building a lease building or occupied by owner (who is concerned about space efficiency factor vs income).

 

[Francis Vineyard]

So in the example above, what do you do about those restrooms and other areas? Just list them in the table as "Unoccupied Area" or "Unused Area" or something else?

If you want could identify these spaces in accordance to Section 202 "Unoccupied accessory areas"

FLOOR AREA, NET. The actual occupied area not including unoccupied accessory areas such as corridors, stairways, toilet rooms, mechanical rooms and closets.