Unreinforced Allan Block walls or gravity walls, can be built up to 1.5m high in very favourable soil conditions, however, the standard is up to 0.9m high. Follow the Allan Block Installation Guide for easy installation instructions. Masonry reinforcement works well for walls up to 4.5m high and geogrid reinforcement can handle walls in excess of 12 metres high. Always consult a qualified Allan Block engineer on retaining walls over 0.9m.
Standard concrete building blocks made in the 1950s using a similar process as Allan Block are still performing in building structures around the world. With today’s technological improvements, we believe Allan Block will last a lifetime*. Check out our tips on caring for your retaining wall.
*Free-thaw cycles and salt exposure might affect the retaining wall life and performance.