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Hoosac Valley High School Natatorium
   
Hoosac Valley High School Natatorium
162 Jay Street, Schenectady, NY 12305, 518 370-1576, Copyright 2009 Synthesis LLP, All Rights Reserved.

Synthesis’ role in this study was to determine the cause and propose a resolution to the moisture problems that plagued the natatorium.

Synthesis utilized a building sciences approach in the investigation of the various material and system failures, analyzing the building construction and condensation in the walls. This approach identified systemic problems present in the original construction, which had been compounded by later renovations. This approach also established a corrective plan of action that would solve the problem, not merely replace finishes and systems.

In the development of the study we assisted our mechanical engineer in visual observation and preparing a study including findings and recommendations in regards to the mechanical systems and structural elements at the Hoosac Valley’s natatorium. Approximately 15 years ago the interior walls of the natatorium were fitted with rigid insulation, most likely in an attempt to save energy. The retrofit insulation inadvertently moved the dew point location of air from within the existing wall cavity to the interior of the natatorium in the interstitial space located between the retrofit insulation and tile wall finish. The condensation that formed on the insulation subsequently migrated to the interior tile finish and further outward through the wall assembly. The associated moisture caused the tile adhesive to fail, thus creating an unsafe situation and ultimately forcing the natatorium to close in 2005.

Installing a proper dehumidification system is necessary to remove the excessive moisture from the indoor enclosure. Efficient dehumidification requires a properly designed air distribution system. Air should be evenly distributed throughout the space and shall not promote evaporation of pool water. Supply air must maintain the surface of the interior walls at a temperature higher than the dewpoint temperature of the air within the space to prevent condensation from forming. Condensation forms as warm, moisture filled air comes in contact with surfaces at a temperature lower than the air’s dewpoint temperature.