Mold was showing through the siding on two sections of this house. Some was in the front and some was on the side. Both were on the second story of the house. We removed the siding, which was crumbling and cut away the rotten plywood boards underneath. Thankfully, the studs and insulation were clean. We replaced the plywood with new plywood, put in new underlayment and hoisted up new siding boards that we'd painted at home. A tricky project but very rewarding, as the mold was caught just in time.