Hays and Ewing eschew pressure-treated and tropical hardwoods in favor of thermally modified lumber. Their product of choice, Cambia by Greenleaf, is treated with heat rather than chemicals—a process the company says improves the wood's dimensional stability and rot resistance. Available as decking or siding, Cambia comes in ash, birch, poplar, and red oak. “We've begun using it in all our decking applications,” Ewing says. Cambia Building Products, 866.960.9663; www.cambiawood.com.
Hays + Ewing Design Studio
allison ewing, aia, leed ap, and christopher hays, aia, leed ap