Limit to IRC Stories

Voting section related to Minnesota building codes.

Are we to assume an IRC structure can only be three stories maximum?

Poll ended at Thu Jan 31, 2008 9:00 pm

Total votes : 26

Limit to IRC Stories

Postby forumadmin » Fri Dec 28, 2007 1:06 pm

IBC Table 503 provides building height limits, whereas the IRC has no such table. In spite of this, IRC Table R602.3(5) and Table R602.3.1 both indicate allowable stud heights, but only up to two floors (and a roof). Table 602.10.1 describes wall bracing up to three stories. Table R403.1 provides specifics for footings supporting foundations to three stories.
Are we to assume an IRC structure can only be three stories maximum? (Excluding an “engineered design” structure.)
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Re: Limit to IRC Stories

Postby John M. » Fri Dec 28, 2007 4:46 pm

It would seem that you then move into the IBC in that scenario. Good question.
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Re: Limit to IRC Stories

Postby D.Bisek » Fri Dec 28, 2007 4:47 pm

Forum admin,

I realize that the State of MN deletes chapter 1 of the IRC, but section R101.2 the scoping requirements state that the provisions of the IRC apply to dwellings and townhomes not more than three stories above-grade in height. I did glance at chapter 1300 and 1309 in the state amendments and could not find the same language, but I assume it is in there somewhere.

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Re: Limit to IRC Stories

Postby Joe Ehrlich » Tue Jan 08, 2008 1:22 pm

I agree with Mr. Bisek. We should look to the scoping provisions of 1300.0040 to determine the applicable number of stories in the residential code, which states "... not more than three stories above grade plane in height ..." If the design does not fall within the structural provisions of the IRC, its either time for an engineer or possibly application of the IBC.
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Re: Limit to IRC Stories

Postby Duane C. Grace » Fri Jan 25, 2008 7:02 pm

I voted Yes in this case as chapter 1300.0040 with reference to the IRC states that this code regulates structures classified as IRC1, 2, 3, and IRC4 to a maximum of 3-stories in height over grade plane.
If a building needs to be higher in stories, than it would be applicable to use the IBC and chapter 1305, now the number of stories is regulated by the construction type, and while chapter 5 states unlimited in height, this usually will be governed by the local zoning codes.
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