This kitchen needed a second subfloor of 3/8" plywood; leveling it with the adjoining dining room and solarium which will have all new wide oak flooring. The original old dining room floor was laid over 240 yr. old tree trunks that were joists for this room structure. I found sheets of true 1" plywood made in Oregon to create a new stable; subfloor which was bolstered and leveled underneath by a central solid 8" beam from PA. The kitchen addition had a crawlspace under it accessed only by a trap door in the middle of it which we removed when digging a new crawl space open to the new dining room one.
The plywood joints were staggered for both subfloors and chalk lines used to screw the boards to joists.
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