How to Get Trapped Water Out of a Flat Roof
Flat roofs tend to be more prone to moisture problems than other designs. A typical flat roof can easily develop a water vapor trap if insulation is sandwiched between impermeable moisture barriers, allowing moisture to make its way into the roof with no means of escape. If you find that you do have excess moisture in your flat roof, it's important to take steps to remove the moisture and prevent damage. Does this Spark an idea?
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Instructions
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Dry the moist parts of the roof by pulling out roofing materials and exposing the moisture to air flow and heat. If sunlight and warmth are not enough to dry the soaked roofing materials, you may need to direct a blower-style fan at the damp roof to aid in thorough drying.
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Replace any insulation that has become ineffective due to waterlogging. Soaked insulation will never be as effective as dry insulation, meaning that moisture problems and household energy inefficiency will persist until the compromised insulation is replaced.
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Install breather or stack vents. Most breather vents are installed at the rate of one for every 1,000 square feet of roof space, but you should always defer to the manufacturer's instructions on this point. Make sure that the vents you use are covered so that rainfall can't seep into the roof through them.
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