lightweight vs normalweight cmu

huangyhg

lightweight vs normalweight cmu
i have a project just going to construction and the architect has specified that exposed burnished block be lightweight, instead of normal weight cmu as designed.  i have checked the wall designs and everything still appears okay.  i have reviewed the codes, but i still feel that there is something else i should be checking.  can anyone offer any further advice on changing the normal weight cmu to lightweight cmu?
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lightweight units have different fire resistant ratings and the lightweight unit may be part of a rated assembly... also less dead load to the foundations...
dik
light-weight units will also affect the strength of any fasteners for signs, studs, decorations or any other part of the exterior that needs to be fastened to the cmu.