Q:
When putting up a 3 tier wall with a 4″ drain tile behind it at the base, what size and type of gravel should I use for the base and what type should I use behind the wall? 1″ or 2″? Washed? Or Crush and run?
A:
For ease of construction, I would recommend using the same stone for your base material and wall rock. As defined in the AB Spec Book: “Material must be well-graded compactable aggregate, 0.25 in. to 1.5 in., (6 mm – 38 mm) with no more than 10% passing the #200 sieve.” If you are going to order only one type of material on the site, I would go with the 1 inch washed. Otherwise you could use the crush and run for the base material and the washed for the wall rock.
Read more about wall rock and construction in the AB Spec Book on allanblock.com.
