Fox Blocks.

Preassembled interlocking blocks are offered in 4-, 6-, 8-, and 12-inch core thicknesses and measure 16 inches tall. Blocks, including corners, are designed to be reversible to speed construction and reduce on-site cuts, foam dust, and waste. Accessories include 45-degree angles, taper tops, T-blocks, and corbel ledges. The system can achieve STC ratings of up to 50 and is designed to meet seismic and high-wind codes. Plastic ties and forms are recyclable and blocks emit no VOCs, says the maker. 877.369.2562. www.foxblocks.com.