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Non destructive testing

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David,

Spray water on the wall or wait until after a rain.  The cells with grout 
will be wet and stand out like a sore thumb --- the cells without grout will 
be dry and match the color of dry block.

If there is a big argument, drill some 1/4-inch diameter holes where you 
suspect there isn't grout.  If there isn't grout in the cell, you will bang 
your head against the wall after drilling 1-1/4 inches (for 8-inch cmu).

Hope this helps.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

David Hall wrote:

>>Does anyone know of a non-destructive method to determine if grout has been
placed in voids of a recently constructed small masonry building.

We suspect shenanigans in Texas.<<