lightweight vs normalweight cmu

[structengineer]

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?

 

[dik]

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

 

[UcfSE]

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.