Thornton, CO

Thornton Natatorium

Scope/Solutions
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Project Summary

Scope/Solutions

The Thorton recreation complex includes a gymnasium, racket ball court, and a natatorium with two large pools and spa. The north masonry exterior wall of the natatorium was experiencing severe efflorescence and while the relative humidity in the natatorium was low, condensation was occurring in the exterior walls. SGH investigated the cause of the building enclosure issues.

Highlights of SGH’s work on this project include the following:

Performed water testing to recreate leaks and disassembled roof and wall sections to understand the construction details
Concluded that deficiencies in the natatorium roof air barrier and seal allowed moist pool air to flow into the cavity of the brick masonry wall and through the roofing causing mildew growth within the roof system, which is composed of asphalt shingles in sloped areas and a ballasted rubber membrane in flat areas
Designed new roof system with a structural air/vapor barrier, thermally broken structural blocking, and venting for a cavity space under shingles
Determined that deficiencies in air barrier construction and in the various mechanical systems caused a positive air pressure condition that contributed to moisture problems
Prepared plans and specifications for repairs and provided full-time monitoring during construction
Provided technical support to the owner to assist in recovering damages