Why limit on light gauge backed masonry veneer height?
Why limit on light gauge backed masonry veneer height?
(OP)
In ACI 530 table 6.2.2.3.1 there are height limits for clay masonry veneer backed by light gauge framing. The commentary does not explain what drives these limits. Thermal and moisture expansion of course have to be considered in the design and detailing of the veneer but I wondered what if any other factors drove this requirement.






RE: Why limit on light gauge backed masonry veneer height?
Stiffening studs is an attempt to prevent cracking of the veneer.
I am more liberal than most engineers, in that I generally allow L/360 deflection of wood or steel studs behind clay masonry veneer. Many engineers limit deflection to L/600. I once heard a speaker say that no mattter how stiff you make the studs, they are still not stiff enough.
DaveAtkins
RE: Why limit on light gauge backed masonry veneer height?
Am looking at a facade design for a 4 story building with a floor-to-floor height of 11 feet. The light gauge stud walls will be designed to carry vertical floor loads and also limit lateral deflection to L/600+- under wind/seismic. But, because of the code requirement cited previously, I will also need to vertically support the veneer at at least one of the intermediate floor levels. Will have a soft hor joint at the support level(s). The architect is going to ask why the code requires this and I don't have a good answer (yet!).
Also, in ACI 530 sec 6.2.2.3.1.3, "the weight of the veneer shall be supported by noncumbustible construction for each story above the height limit given in table 6.2.2.3.1." So it sounds to me like the vertical support has to be provided at EACH floor level above the 30' limit. Theres an obvious cost here and I wonder what is driving this requirement.
Any additional comments appreciated.
RE: Why limit on light gauge backed masonry veneer height?
RE: Why limit on light gauge backed masonry veneer height?
If shelf angles are not used on taller buildings, it can cause failure of sealants, cracking of brick, drywall, windows, etc.
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RE: Why limit on light gauge backed masonry veneer height?