Strocks are unfired masonry blocks of clay-rich earth and chopped straw. The blocks are intended for low-rise structural and non-structural wall construction, typically up to three storeys. Unlike fired masonry, the production process avoids kiln firing, reducing energy input at manufacture. Performance characteristics such as compressive strength and fire classification are not published on the manufacturer’s website and must be confirmed by project testing where required. The blocks are compatible with lime-based mortars and plasters and are intended for use in natural and low-impact construction. Manufacturing is based in the UK with regional distribution.