While I cannot refer to any specific definition or explanation for either term, I can only relate what was told to me so long ago I can't remember who said it. 

"Interstitial" referred to the concealed space between floors, while "attic" referred to that space above the ceiling on the top floor.
Ken Wagoner, SET
Parsley Consulting
500 West Mechanic Street
Harrisonville, Missouri 64701-2235

Phone: (760) 745-6181
Visit the website

 


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