It seems every home has a room that is a sun porch, front porch, back porch or what ever type of porch you want to call it that has a plywood ceiling. My sun porch has just that. The ceiling is a ...

A: The mildew is growing because the porch ceiling gets wet, most likely from condensation that forms there because of the way a porch straddles the divide between indoors and outdoors. Air under a ...