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Re: foundation on rock

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Karen:
 
Are you reviewing this for DSA ?
 
Why is a mat being used ?  Is this because of probable settlement issues when you have a cut/fill line crossing your project ?  Is the mat designed for differential settlement ?
If this is the case, then extending all the foundation walls and footings to the bedrock in my opinion is probably better choice.  Design a 4" slab over compacted fill or pea gravel to span between foundation walls. 
 
Do you have to trench in rock for utilities ?
 
Is there a soils report ?
 
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA