RSW,
I never said I do this to not upset my clients. And I agree with you that as much as possible the appraiser should exhaust every necessary step in an attempt to comply with this requirement, even if it means a delay in delivery of the report. My issue arises when it appears that it can not or will not be done. I will make a deal with everyone here. The next time I come across a property where inspection of either the attic or crawlspace is just not possible I will make the phone call to the mothership. I will explain to them the exact scenario and see what they say. It may be awhile as this is a very infrequent occurence. If at that time they say the report cannot be completed under any condition and that inspection must take place, I will let you know (and eat crow as well). If they say to proceed I wil let you know as well.
I am not meaning to sound argumentative or that I am a know-it-all. I, like many here, are seeking clarification from whatever powers that be once unique circumstances present themself.