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I have been helping a relative repair their home after flooding from Hurricane (or Tropical Storm) Sandy. They had about 2 feet of water in the 1st floor of their house. We had removed all of the sheetrock, insulation and electrical. All effeted areas inside have been cleaned with bleach. This past weekend we have been reframing a protion of the house for new windows. Re removed the exterior siding, cementatious shingles (about 15 years old) on Tar paper over 1/2" CDX plywood. Much to our suprise the lower part of the plywood was still damp, and in some instances spongy, when we removed the Tar paper there was some areas of dampness between the Tar paper and plywood and there was also mold as well, not horrible, but a fair amount of mold. We spot checked the rest of the house and decided to remove the 1st row of plywood (4 feet up). They will be residing the house. We did find mold on the back of the plywood where is was attached to the studs and also mold on the stud as well. We will be cleaning the stud surface (where it met the plywood) with bleach, the other 3 sides of the stud have been cleaned and look clean. Here is my question. Prior to installing new plywood is it a good idea to paint the studs and the plywood, either front or back of the plywood or both with either a paint or wood perservative. Would this help prevent mold growth in the future and also help with mold removal in the future if there is (god forbid) another flood. Please let me know what you think.