So this is not under the IRC, it's an R2,This is a single family 5th floor and roof penthouse suite of a multi use building
its simple,What about minimum tread depth? I see 7.5" required within the first foot of the narrowest edge in the FBC but again this stair isn't required for egress. In that case, does this requirement not matter?
I see the residential FBC has less stringent spiral stair requirements than the regular FBC: "Each tread shall have a depth of not less than 6-3/4 inches (171 mm) at the walkline" I'm allowed to use this code for this residential apt in a mixed use commercial building correct?its simple,
You are not required to install the spiral, but if you do it has to be per code.
The same goes for an electrical outlet, just because you add another outlet on the wall and the spacing is less than 72" x 72", does not mean the outlet in between doesn't have to comply with the electrical code.
Its a minimum building code, just because you add more than the code requires, does not mean you don't have to install all the extra stuff to code.
The IRC is for 1 and 2 family dwellings 3 stories or less in total height.I see the residential FBC has less stringent spiral stair requirements than the regular FBC: "Each tread shall have a depth of not less than 6-3/4 inches (171 mm) at the walkline" I'm allowed to use this code for this residential apt in a mixed use commercial building correct?
What are the requirements of a 12' landing for a long spiral stair? The width of the stair is 5' - does the outer edge of the landing have to be 5' then?So this is not under the IRC, it's an R2,
Thus under the IBC, 144in max rise between landings per the FBC, I would check with the local AHJ and see if they do consider it an MOE and if they will let you apply for a variance, its a direction and shot, but as on the books, max 144 and needs a mid landing.
If this is in the individual space of an R2, and is a winder not a spiral, then the riser could be 7.75"I also see a requirement that the stair to be considered a spiral stair can't be more than 24.5" wide from center point to walkline or else its considered a stair with max riser height of 7" instead of 9.5". This stair's walkline is 30" away (1.5' to 6.5" from center line for 5' stair). I don't see this in the FBC standard building code