Questionable Insulated Grade Wall Detail?
Questionable Insulated Grade Wall Detail?
(OP)
Hi all. Our firm is designing the foundations on a new building and we have been asked to use the attached detail for the grade walls. I have a few concerns regarding this detail, such as the settlement of the slab, the metal studs bearing on rigid insulation, and room for the connection of the metal studs to the block below. I suppose the settlement of the slab could be addressed with the proper compaction of the fill but is my concern justified on the other two points? Does anyone have a suggestions on a better approach? It is my understanding that the builder is concerned about meeting the insulating requirements of the local jurisdiction and is the reason he proposed this detail. Thank you in advance for your thoughts and suggestions.






RE: Questionable Insulated Grade Wall Detail?
Some issues I see:
1. The connection of the studs to the 6" CMU might be tough to do - concrete screws perhaps? Must resist lateral wind forces.
2. The studs, if load bearing, will only compress the block as it is much stiffer than any insulation - however, the load would be eccentric, applying moment to the 6" wall.
We use a 1/2" joint between slab and grade wall with a thicker wall - and avoid the stud "overhang".
RE: Questionable Insulated Grade Wall Detail?
BA
RE: Questionable Insulated Grade Wall Detail?
RE: Questionable Insulated Grade Wall Detail?
As an alternate connection, simple might be best - replace the CMU wall with a cast-in-place wall wide enough for the metal stud to sit on. It may be more expensive than a CMU wall (though that's hard to say, depending on the construction schedule and the rest of the building. If there's not already going to be CMU elsewhere on the job, it might be cheaper) but it'll be easier to transfer any loads you might have, and will simplify the light gauge installation.
Brian C Potter, PE
http://simplesupports.wordpress.com
RE: Questionable Insulated Grade Wall Detail?
RE: Questionable Insulated Grade Wall Detail?
RE: Questionable Insulated Grade Wall Detail?
If they're going to do that, why bother with the CMU at all? Just go ahead and make it a cip wall.
Brian C Potter, PE
http://simplesupports.wordpress.com
RE: Questionable Insulated Grade Wall Detail?
Dik
RE: Questionable Insulated Grade Wall Detail?
RE: Questionable Insulated Grade Wall Detail?
Dik
RE: Questionable Insulated Grade Wall Detail?
As for the type of construction I am not sure why the builder would not rather just go with a poured wall unless he is not set up well for that type of pour.
RE: Questionable Insulated Grade Wall Detail?
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