1. (a) Frame piers less than 36 inches high shall be:

   1. (1) Permitted to be constructed of one single open or closed concrete blocks 8-inch x 8-inch x 16-inch conforming to ASTM C-90; and

   2. (2) Installed so the long sides are at right angles to the I-beam, as set forth in Figure 700-1:

      Figure 700-1 Pier Installation, Single Concrete Block

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2. (b) All piers over 67 inches shall be designed by a licensed New Hampshire architect or engineer.
3. (c) Piers for exterior wall openings shall be constructed of blocks that are 8-inch x 8-inch x 16-inch.
4. (d) Perimeter piers shall be installed parallel to the perimeter, when required by the manufacturer’s installation instructions.

5. (e) Piers required at marriage line supports, perimeter piers, and piers at exterior wall openings shall be permitted to be constructed of single open or closed-cell concrete blocks 8-inch x 8-inch x 16-inch to a maximum height of 54 inches. Piers over 54 inches but less than 67 inches shall be solid grout filled and reinforced with 2 pieces of #5 reinforcement bar as set forth in Figure 700-2:

   Figure 700-2 Pier Installation, Double Concrete Blocks

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6. (f) Manufactured piers shall be listed, labeled, and installed to manufacturer’s instructions.

Source. #14221, eff 2-25-25