N.H. Code Admin. R. Inst 603.12 - Anchoring Instructions, Security Against Wind

(a) After blocking and leveling the home, the installer shall secure the house against wind. The anchoring and foundation system shall be capable of meeting the loads required by 24 CFR 3280 & 3282 in effect.
(b) Anchors shall be capable of resisting a minimum total load capacity of 4725 lbs. and a working capacity of 3150 lb. Anchors and anchoring equipment shall be certified by an engineer or tested to national standards and installed as specified by the anchor manufacturer.
(c) Tie-down straps shall conform to the following:
(1) Cable or steel strap with a breaking strength of at least 4, 725 lbs. shall be galvanized aircraft cable at least ¼ inches diameter or Type 1, finish B, grade 1 steel strapping 1 ¼ inches wide and 0.03" thick, conforming to the American Society for Testing and Materials (ASTM) D3953-91; and
(2) Galvanized connection devices such as turnbuckles, eyebolts, strap buckles and cable clamps shall be rated at 3,150 working load minimum.
(d) Installers shall use diagonal tie downs in both transverse and longitudinal directions for single wide and doublewide houses.
(e) The number of anchors and spacing of anchors shall conform to manufacturer's installation instructions.
(f) Each anchor shall be manufactured and installed in accordance with NFPA 225, 2005 edition.
(g) If side-wall or over the roof straps are installed on the house, they shall be connected to an anchoring device.


N.H. Code Admin. R. Inst 603.12

#8494, eff 12-24-05; ss by #10155, eff 4-14-12

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