(A) Anchoring
instructions.
(1) After blocking and
leveling, the manufactured home shall be secured against the wind by use of
anchor assembly type installations or by connecting the home to the alternative
foundation system. See rule 4781-6- 03.3 of the Administrative
Code.
(2) For anchor assembly type
installations, the installation shall ensure the manufactured home is secured
against the wind as described in this section. Installations not completed in
accordance with the manufacturer's installation instructions shall meet
these standards or be designed by an Ohio registered professional engineer or
registered architect in accordance with acceptable engineering practice, the
design loads of the MHCSS, and rule
4781-6-
03.3 of the Administrative Code.
(3) All anchoring and foundation systems
shall be capable of meeting the loads that the manufactured home was designed
to withstand as required by
the MHCSS and rule 4781-6-
03.3 of the Administrative Code as well as the loads the
manufactured home was designed to withstand as shown on the home's data plate.
However, if a home is placed in a zone that is less
than the zone on the data plate, then the
anchoring and foundation requirements may be designed to the zone in which the
home is placed; unless specifically excluded by the manufacturer of the
home.
(4) When an Ohio registered
professional engineer or registered architect designs anchoring, the
installation instructions are to include at least the following information and
details for anchor assembly type instructions:
(a) The maximum spacing for installing
diagonal ties and any required vertical ties or straps to ground
anchors;
(b) The minimum and
maximum angles or dimensions for installing diagonal ties or straps to ground
anchors and the main chassis members of the manufactured home;
(c) Requirements for connecting the diagonal
ties to the main chassis members of the manufactured home. If the diagonal ties
are attached to the bottom flange of the main chassis beam, the frame shall be
designed to prevent rotation of the beam;
(d) Requirements for longitudinal and mating
wall tie downs and anchorage;
(e)
The method of strap attachment to the main chassis member and ground
anchor,
including provisions for swivel-type connections;
(f) As applicable, the
requirements for sizing and installation of stabilizer plates.
(B) Ground anchor
installations.
(1) Specifications for tie-down
straps and ground anchors.
(a) Ground anchors.
Ground anchors shall be listed, be provided with protection
against weather deterioration and corrosion at least equivalent to that
provided by a coating of zinc on steel of not less than 0.30 ounces per square
foot of surface coated, and be capable of resisting a minimum ultimate load of
four thousand seven hundred twenty-five pounds and a working load of three
thousand one hundred fifty pounds, unless reduced capacities are noted in
accordance with note 11 of table 4.1 of this rule or note 12 of tables 4.2 and
4.3 of this rule. The ultimate load and working load of ground anchors and
anchoring equipment shall be determined by a registered professional engineer,
registered architect, or tested by a nationally recognized third party testing
agency in accordance with a nationally recognized testing protocol
that meets or exceeds the certification and testing
protocols as set forth in
24 C.F.R. 3285.402(b)
.
(b) Tie-down straps.
A one and one-quarter inch by thirty-five
hundredths of an inch or larger steel strapping
conforming to ASTM D 3953, "Standard Specification for Strapping, Flat
Steel and Seals, Type 1 Grade 1, Finish B," with a minimum total capacity of
four thousand seven hundred twenty-five pounds and a working capacity of three
thousand one hundred fifty pounds shall be used. The tie-down straps shall be
provided with protection against weather deterioration and corrosion at least
equivalent to that provided by a coating of zinc on steel of not less than 0.30
ounces per square foot of surface coated. Slit or cut edges of coated strapping
need not be zinc -coated.
(2) Number and location of ground
anchors.
(a) Ground anchor and anchor strap
spacing shall be:
(i) No greater than the
spacing shown in tables 4.1 to 4.3 of this rule and figures 4A and 4B of this
rule; or
(ii) Designed by an Ohio
registered engineer or architect in accordance with acceptable engineering
practice, Chapter 4781-6 of the Administrative Code, and the requirements of
the MHCSS.
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(b) Longitudinal anchoring. Manufactured
homes in Ohio are not required to be stabilized against the wind in the
longitudinal direction unless specified in the manufacturer's installation
manual or by an Ohio registered professional engineer or registered architect.
An Ohio registered professional engineer or registered architect shall design
alternative longitudinal anchoring methods in accordance with acceptable
engineering practice.
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(c)
The requirements in this rule shall be used to determine the maximum spacing of
ground anchors and their accompanying anchor straps based on the soil
classification determined in accordance with rule 4781-6-
03.2 of the Administrative Code.
(i)
The installed ground anchor size (length) shall be for the listed soil
class.
(ii) All ground anchors
shall be installed in accordance with their listing or certification and the
ground anchor manufacturer's installation
instructions.
(iii) Plate size and
type. The size and type of stabilizer plate to be provided shall be determined
by the manufacturer of the anchor in accordance with the ground anchor listing
or certification. Metal stabilizer plates shall be provided with protection
against weather deterioration and corrosion at least equivalent to that
provided by a coating of zinc on steel of not less than 0.30 ounces per square
foot of surface coated. Alternatively, ABS stabilizer plates may be used when
listed and certified for such use.
(3) Each ground anchor shall be manufactured
and provided with installation instructions in accordance with its listing or
certification. A nationally recognized testing agency shall list, or a
registered professional engineer or registered architect shall certify, the ground anchor for use in a classified soil (see
rule 4781-6- 03.2 of the Administrative Code) based on a
nationally recognized testing protocol.
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(C) Sidewall, over-the-roof, mate-line, and
shear wall straps.
If sidewall, over-the roof, mate-line, or shear wall straps are
installed on the home, they shall be connected to an anchoring assembly.
(D) Severe climatic conditions.
In frost-susceptible soil locations, ground anchor augers shall
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 rule 4781-6- 03.3 of the Administrative
Code.
(E) Flood hazard
areas.
In flood hazard areas, the piers, anchoring, and support
systems shall comply with FEMA 85 requirements and shall be capable of
resisting all loads associated with design flood and wind events or combined
flood and wind events. See rule 4781-6- 03.1 of the Administrative
Code. In manufactured home parks, manufactured homes shall be installed in
accordance with Chapter 4781. of the Revised
Code.
