The moist air cools and liquid water condenses out of the air as it strikes the cold plywood surface. Edges of the vapor retarder should be overlapped and fastened to the bottom face of the rafters creating a tighter, more continuous surface. Make sure to seal the edges. This will reduce the dew point temperature to 37 degrees limiting the frequency of the problem. The combination of proper roof ventilation, tight construction and low indoor humidity levels will help minimize the chance this problem will occur.
Floor boards squeak as homeowners walk across the floor.
Squeaky floors rank high in nuisance value. Customers usually hold their complaints until the squeak has exploded their nerve endings, placing the attempted fix under the closest scrutiny. Squeaks result from wood rubbing against wood. But effecting that theory may be difficult. A common source of noise arises when a floor joist shrinks after it is installed.