Each block is made from wet-cast, air-entrained concrete with a minimum PSI of 3,000 for incredible strength and durability that exceeds industry standards. With a 4 way recess suitable for standard 100mm x 50mm timber supports and a centre recess to take a 100mm x 100mm riser post, each recess incorporates drainage channels to protect the timber joists, giving your deck base additional longevity. Economical and easy to install, Shea Concrete retaining walls feature a unique locking system that permits walls as high as 12 without a geo-grid.
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