Section 385-890-D-VII - Perimeter Support PiersA. Piers required at mate-line supports, perimeter piers, and piers at exterior wall openings are permitted to be constructed of single open-cell or closed-cell concrete blocks, with nominal dimensions of 8 inches x 8 inches x 16 inches, to a maximum height of 54 inches as shown in Figure A to this section, when the design capacity of the block is not exceeded.B. Piers used for perimeter support must be installed with the long dimension parallel to the perimeter rail.02-385 C.M.R. ch. 890, § D-VII