Material Estimation Worksheet
Order Materials
Blocks
Ordering block is easy. Use the following steps or visit allanblock.com for helpful estimating tools.
Note
*Wall height needs to have the amount of buried block included. Buried block should be a minimum of 6 in (150 mm) or 1 in (25 mm) for each 1 ft (0.3 m) of wall height. See the approved plans to find out what the final height including the buried block will be. **Extra blocks will need to be included if walls have step ups and/or stairs. Ordering an extra 5% is always recommended to account for any problems during construction. See your local Allan Block dealer for exact block dimensions, which need to be used when estimating blocks.
Base and Consolidation Zone
Allan Block recommends using the same material for the base, within the block cores and behind the blocks. A well-graded (balanced mix of grain sizes) compactible aggregate, 0.25 in to 1.5 in (6 mm to 38 mm) diameter with less than 10% fines is needed. Check your local aggregate sources for availability.
These estimates use the minimum amount of material required to build a wall. See the approved plans for exact amounts.
A.) Base
The minimum base for a geogrid reinforced retaining wall is: 2 ft (0.6 m) wide x 0.5 ft (0.15 m) high.
Convert cubic feet (cubic meters) to tons by:
B.) Block Cores and Consolidation Zone
This includes the material in the block cores plus a 12 in (300 mm) layer behind the blocks.
Convert cubic feet (cubic meters) to tons by:
C. Add the totals from A & B together
Geogrid
Using the approved plan, contact your local geogrid supplier or Allan Block Representative for geogrid specifications and assistance in ordering materials
Drain Pipe
The length of the wall will usually determine the same amount of drain pipe needed. Check the approved plan for exact specifications and locations of the drain pipe.
Infill Soils
Using the approved plan, contact your local geogrid supplier or Allan Block Representative for geogrid specifications and assistance in ordering materials
AB Capstones
Adhesive for Capstones
Use one 29 ounce tube (820 gm) of adhesive for every 60 ft (18 m) of wall length where capstones will be installed.