Masonry Magazine June 1988 Page. 20
TABLE 7. MINIMUM RADII FOR CIRCULAR
CONCRETE MASONRY WALLS TO PRODUCE
MINIMUM PROJECTIONS FOR UNITS
WITH NOMINAL 8 INCH LENGTH
| Nominal Width (in.) | r (ft.-in.) | n | Projection Limited to 1/8 in. Required Cutting (in.) | r (ft.-in.) | n | Projection Limited to 1/4 in. Required Cutting (in.) |
|---|---|---|---|---|---|---|
| 4 | 5'-5" | 51 | 3/16 | 2′-9″ | 26 | 5/8 |
| 6 | 5'-5" | 51 | 7/16 | 2-9 | 26 | 1 1/8 |
| 8 | 5′-5″ | 51 | 11/16 | 2′-9″ | 26 | 1 5/8 |
| 10 | 5′-5" | 51 | 15/16 | 2'-9 | 26 | 2 1/8 |
| 12 | 5′-5" | 51 | 1 3/16 | 2′-9″ | 26 | 2 9/16 |
Interior Mortar Joints Maintained at Approximately 1/8 inch
Specialty Units
Where the size of a radial wall is such that sufficient units are required to make it economically feasible to produce specially designed units, radial units specifically designed to form a curved wall may be desirable. It will be necessary to check with local block suppliers to determine if this is a practical alternative.
TABLE 8. MINIMUM RADII FOR CIRCULAR
CONCRETE MASONRY WALLS TO PRODUCE
MINIMUM PROJECTIONS FOR UNITS
WITH NOMINAL 16 INCH LENGTH
| Nominal Width (in.) | r (ft.-in.) | n | Projection Limited to 1/8 in. Required Cutting (in.) | r (ft.-in.) | n | Projection Limited to 1/4 in. Required Cutting (in.) |
|---|---|---|---|---|---|---|
| 4 | 21-5" | 101 | None | 10-10 | 51 | 3/16 |
| 6 | 21′-5" | 101 | 1/8 | 10'-10" | 51 | 7/16 |
| 8 | 21'-5" | 101 | 1/4 | 10'-10 | 51 | 11/16 |
| 10 | 21′-5″ | 101 | 3/8 | 10′-10" | 51 | 15/16 |
| 12 | 21′-5″ | 101 | 1/2 | 10'-10" | 51 | 1 3/16 |
Interior Mortar Joints Maintained at Approximately 1/8 inch
Construction and unit manufacturing tolerances are such that the Radii provided in the Tables may vary by plus or minus one inch.
Split ribbed units were selected to provide a distinctive appearance to this radial wall
NATIONAL CONCRETE MASONRY ASSOCIATION
P.O. Box 781, Herndon, Virginia 22070