The plumber will return to finish his work after the subfloor and the floor have been replaced.

The top of the cross bridging is nailed to the top of the floor joist before the subfloor is installed. The bottom of the bridging is nailed in place after the subfloor is installed.

Subflooring is the wood on which the visible floor is lain. A rotted wood subflooring is when the subfloor timbers have been exposed to water and have begun to rot, thus undermining the floor as a whole. The floor will have to be removed and the subfloor replaced.

Stagger them

# You are installing it onto the correct subfloor. 1/4" BC pine plywood is the best if you are not on concrete. # The subfloor is clean and dry. # Any imperfections on the floor are sanded and leveled. If you fail to do this, those imperfections will telegraph into the new vinyl. # After completion, the floor MUST be rolled with a 100 lb roller.