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Harrisonburg hot yoga studio keeps moisture out
The article details the renovation of Bikram Yoga Harrisonburg, a 214-m² (2300-sf) hot yoga studio located on the first floor of a 130-year-old building in Virginia. The primary challenge in this project was to create an interior environment capable of maintaining a constant temperature of 40.5 C (105 F) and 40 percent humidity, which are the optimal conditions for hot yoga sessions, while simultaneously preventing moisture-related issues such as mold growth and structural damage. The studio’s owner prioritized the health and safety of occupants, necessitating a robust vapor barrier system.
The design team specified sprayed polyurethane foam (SPF) due to its dual functionality as both an insulation material and an effective air and water barrier. Ken Wells, the insulation expert on the design team, emphasized the critical nature of this design choice to minimize leakage and thermal bridging, all while adhering to budgetary constraints. The installation process involved applying sheets of 1.2 by 2.4 m (4 by 8 ft), 25-mm (1-in.) thick, moisture-resistant rigid insulation to the stud wall framing. This was followed by a 51-mm (2-in.) layer of closed-cell SPF applied to the substrate, covering a 279 m² (3000 sf) area over two days.
The continuous, fully adhered SPF system was crucial in preventing thermal bridging and effectively managing humidity to protect the wood studs from moisture damage. Custom clips were utilized, attached to the wood studs, extending through the rigid insulation and SPF layer, and then secured to the drywall for structural support. To achieve the required humidity levels within the studio, a humidifier was integrated into the HVAC system.
Beyond its primary function as a vapor barrier and insulator, the spray foam insulation contributed several additional benefits to the studio. These included improved indoor air quality (IAQ) by creating a tighter building envelope, a high insulation R-value for energy efficiency, complete adherence to the substrate to fill any voids or cracks, and the elimination of unwanted noise or odors, creating a more conducive environment for yoga practice. The renovation also encompassed other essential areas of the studio, such as showers, a change room, and an ambient lobby space, ensuring a comprehensive upgrade to the facility.
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