In frost-susceptible soil locations, ground anchor augers must be installed below the frost line, unless the foundation system is frost-protected to prevent the effects of frost heave, in accordance with acceptable engineering practice and § 3280.306 of this chapter and § 3285.312.
source: 72 FR 59362, Oct. 19, 2007, unless otherwise noted.
cite as: 24 CFR 3285.404