I did landscaping 3 summers during high school/college and we did some massive walls with Versa-lok. Each row locks into the one below with composite pins so the wall is extremely durable when done correctly.
You need to dig a 24" wide trench that is deep enough for a 6" compact clean gravel bed and 0.1*wall height embedded ie 48" wall = 4.8" of block under dirt level. Use a hand tamp to start the gravel bed and finish with a motorized tamp. Get it as level as possible before you start laying blocks or it will be a giant PITA. Set your first row DEAD LEVEL. After that it is a breeze. Backfill it with more clean gravel and remember to put in 3 or 4" plastic drainage pipes. If you are building over 4ft high you need to put in geomesh reinforcment every 3 ft high if I remember correctly.
e: as far as cost goes, I remember my boss charging around $50+/sq ft of wall. These things add up quickly.
You need to dig a 24" wide trench that is deep enough for a 6" compact clean gravel bed and 0.1*wall height embedded ie 48" wall = 4.8" of block under dirt level. Use a hand tamp to start the gravel bed and finish with a motorized tamp. Get it as level as possible before you start laying blocks or it will be a giant PITA. Set your first row DEAD LEVEL. After that it is a breeze. Backfill it with more clean gravel and remember to put in 3 or 4" plastic drainage pipes. If you are building over 4ft high you need to put in geomesh reinforcment every 3 ft high if I remember correctly.
e: as far as cost goes, I remember my boss charging around $50+/sq ft of wall. These things add up quickly.
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