Leff Project – LEED Platinum Single Family

Strategies and Results
The existing home foundation was reused, and advanced framing techniques and building envelope upgrades were used to improve energy efficiency and reduce construction waste. Superior walls with spray foam were used in the crawl space foundation of the new addition. BioPCM phase change material was used in west facing walls and ceiling deck under solar shingles. A spray foam/rock wool combination was used in other areas in the home. The south-facing roof incorporates DOW POWERHOUSE™ solar shingles to generate building-integrated renewable energy. Earth tubes were installed to temper incoming air.

Exemplary Performance
Ultra high-efficiency bathroom fixtures, including a wall-mounted Duravit toilet in master bath, were used to maximize water efficiency. Drought tolerant natural landscaping was used to reduce irrigation water demand by an estimated 62%. Aging-in-place design strategies were incorporated to ensure owners could stay in the home regardless of mobility issues that may arise in the future. Plumbing for future grey water management was installed as local building codes allow. Energy and solar modeling performed to bring project as close to net-zero energy use as possible.