---
kind: "section"
citation: "24 C.F.R. § 3285.307"
title: "24"
number: "3285.307"
heading: "Perimeter support piers."
url: "https://uscodex.org/cfr/24/3285.307"
---

# §3285.307. Perimeter support piers.

- (a) 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 × 8 inches × 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.

## Notes

### Authority

Authority: 42 U.S.C. 3535(d), 5403, 5404, and 5424.

### Source

Source: 72 FR 59362, Oct. 19, 2007, unless otherwise noted.