IBC 1805.5 "Lateral Support"
IBC 1805.5 "Lateral Support"
(OP)
Hello everyone,
I've cross-posted this from the IBC (Building Officials) forum.
I've been pushed (once again) by our local concrete contractor to allow a basement wall to be built according to IBC minimums (Tables 1805.1(1) through 1805.5 (5).
1805.5 states that the tables may be used when the top and bottom of the wall is laterally supported.
With a building 80 feet long, 30 feet deep and a walk-out basement, I say the floor does not constitute "lateral support" but would love to find a definitive code reference.
Is there an IBC white paper or something that anyone is aware of. I'm tired of having this argument!
Thanks all.
I've cross-posted this from the IBC (Building Officials) forum.
I've been pushed (once again) by our local concrete contractor to allow a basement wall to be built according to IBC minimums (Tables 1805.1(1) through 1805.5 (5).
1805.5 states that the tables may be used when the top and bottom of the wall is laterally supported.
With a building 80 feet long, 30 feet deep and a walk-out basement, I say the floor does not constitute "lateral support" but would love to find a definitive code reference.
Is there an IBC white paper or something that anyone is aware of. I'm tired of having this argument!
Thanks all.






RE: IBC 1805.5 "Lateral Support"
Once he sees what it takes - I think he might listen.
RE: IBC 1805.5 "Lateral Support"
Wood diaphragms get really gnarly if you reduce the diaphragm capacity by .56 for permanent loads per footnote "h" of the 2006 IBC diaphragm tables.
I'm still looking for a reference that might define "lateral support" as a 'diaphragm of adequate strength' or some such thing so I can point to it in the code.
My client (architect) understands what I'm telling him, but his client (owner) wants to believe the concrete contractor because the walls are cheaper to build.
RE: IBC 1805.5 "Lateral Support"
RE: IBC 1805.5 "Lateral Support"
RE: IBC 1805.5 "Lateral Support"
If there's a pill, there's a way.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: IBC 1805.5 "Lateral Support"
By making the use of the prescriptive tables dependent on having "lateral support" at the top and bottom of the walls, without specifying what constitutes "lateral support", its open to interpretation by anyone - including non-engineers. Then the non-engineers want to argue the point again and again.
It would be great if the ICC has issued a "Technical Opinion" on this to shut down the argument right from the start. Anybody a member of ICC that could check?