Allan Block retaining walls (and all segmental retaining walls) should include burial to prevent undermining due to erosion over time, but how much should you bury? Best Practices recommends 1 in (2.5 cm) of block per 1 ft (30 cm) of wall height, with a minimum of 6 in (15 cm). (Reference: Best Practice chapter 2.6) In cases where there is a slope above or below the wall, this recommendation will change. In these cases, feel free to call our engineering team at Allan Block or review other sections of Best Practice – for instance Chapter 9 section 9.1, embedment for slopes below the wall. (ref. BP, Chapter 2.6)
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