Water concentrates around window and door openings

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Another source is elevated relative humidity (RH)—the amount of water in the air compared to the maximum amount it can hold at a given temperature. Cold air cannot hold as much water as warm air. When air comes in contact with a surface that reduces its temperature so the relative humidity reaches 100 percent, dewpoint temperature has been reached; building surfaces at or below dewpoint temperature will condense water onto the surface of building materials. Keeping the RH low keeps the dewpoint temperature low, reducing the potential for condensation.

Further precipitation and groundwater lead to bulk moisture intrusion. The cause might rcs data be faulty or non-existent flashing, poor site grading, improper or non-existent rainscreens behind exterior claddings, or non-existent or poorly maintained gutters and downspouts.

, the roofline, construction joints, and the base of exterior walls. The building envelope acts as the interface between the interior and exterior of buildings; to avoid moisture problems in extreme weather conditions, the building envelope must control water from all of these factors.