24 CFR § 3285.307 - Perimeter support piers.

---
identifier: "/us/cfr/t24/s3285.307"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "24 CFR § 3285.307 - Perimeter support piers."
title_number: 24
title_name: "Housing and Urban Development"
section_number: "3285.307"
section_name: "Perimeter support piers."
chapter_name: "OFFICE OF ASSISTANT SECRETARY FOR HOUSING—FEDERAL HOUSING COMMISSIONER, DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT"
part_number: "3285"
part_name: "MODEL MANUFACTURED HOME INSTALLATION STANDARDS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 3535(d), 5403, 5404, and 5424."
regulatory_source: "72 FR 59362, Oct. 19, 2007, unless otherwise noted."
cfr_part: "3285"
---


# 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.