I HIRED A CONTRACTOR TO BUILD MY TIMBER FRAME HOME WITH SIPS SHELL. CONTRACTOR INTENDS TO INSTALL TIMBER FRAME ONTO THE FLOOR SHEETING WITH CUTOFF RIGHT UNDER SUBFLOOR WITHOUT CONTACTING FOUNDATION. HE PLANS ON GENERAL CONTRACTOR INSTALLING SQUISH BLOCKS OR SCRAP LUMBER BETWEEN FOUNDATION PLATE AND UNDERSIDE OF TIMBER AFTER BUILDING IS ERECTED. I DO NOT BELIEVE THIS IS STRUCTURALLY SOUND. PLEASE GIVE ADVISE ON IF THIS IS A COMMON ENGINEERED PRACTICE AND SHOULD I AGREE WITH THIS TYPE OF INSTALL.