not so much complicated as annoying and tedius. the builder of this place should have been fired. the sub floot was made of MDF and it was not only naled to the floor joist, it was also glued. getting glued mdf off a 2x6 in a clean mannor under the wall took hours of just scrapeing with a chissle. oh ya and they dident sheeth the walls under the vinal sideing so next spring im going to have to take off all the siding and sheeth the walls. yipy.