Masonry Magazine July 2009 Page. 31
SCAFFOLD PLANK
LAMINATED OR SOLID SAWN
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READER SERVICE #160
SAFETY IN
SCAFFOLDING
Moisture movement in the built environment
MOISTURE CAN PRESENT ITSELF in the built environment in a number of ways. The main avenues for water infiltration are:
* Kinetic energy-Rainwater driven through the roof system, mortar joints or other entry point
* Capillary action-Water seepage through cracks, holes or drawn toward drier environments
* Gravity-Water flow down sloping design elements with entry into the building envelope
* Pressure differential-Pressure differences in the building envelope that push the water into openings
* Water vapor-Moisture transported by diffusion or air leakage.
A properly designed and built masonry system will take into account these possible avenues for water infiltration. Masonry systems typically utilize some variation of moisture management-including the appropriate air space, flashing, weather-resistive moisture barrier, termination bars, drip edges, sealing seams, weeps, vents, and/or other tools - to effectively remove the majority of water infiltration. The combination of the cladding and moisture management system in the wall's envelope provides the first protection against the environmental elements. However, this combination alone is no match against water vapor.
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READER SERVICE #205
July 2009
MASONRY 29