Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep enough to completely bury at least one full course, including space for 6 to 8 ...

Green360 Technologies has penned an agreement to produce low-carbon retaining wall blocks with leading WA precast concrete manufacturer PERMAcast. PERMAcast will fund the purchase of a block laying ...