Ohio Administrative Code › Title 4781 - Ohio Manufactured Homes Program › Chapter 4781-6 - Installation Standards › Section 4781-6-03.2 - Site preparation

Current through all regulations passed and filed through July 1, 2024
(A) Soil
			 conditions.
To help prevent settling or sagging, the foundation shall be
				constructed on firm, undisturbed soil or fill compacted to at least ninety per
				cent of its maximum relative density. In any site, all organic material such as
				grass, roots, twigs, and wood scraps shall be removed from the underneath of
				the manufactured home and in areas where footings are to be placed. In an
				existing site, all organic material such as grass, roots, twigs, and wood
				scraps shall have been removed in areas where footings were placed. The home
				site shall be graded or otherwise prepared to ensure adequate drainage in
				accordance with this rule.
(B) Soil classifications and bearing
			 capacity.
The soil classification and bearing capacity of the soil shall
				be determined before the foundation is constructed and anchored. The soil
				classification and bearing capacity shall be determined by one or more of the
				following methods:
(1) Soil tests.
			 Soil tests that are in accordance with generally accepted engineering
			 practice;
(2) Soil records. Soil
			 records of the applicable authority having jurisdiction;
(3) Soil classifications and bearing
			 capacities. If the soil class or bearing capacity cannot be determined by test
			 or soil records, but its type can be identified, the soil classification,
			 allowable pressures, and torque values shown in the following table may be
			 used;
Soil Classification Table  2.1  of
				4781-6-  03.2
Soil Classification No.
Soil
Classification ASTM D2487 or D2488
Soil Description
Allowable Bearing Pressure (psf)1
Blow Count
ASTM
D1586
Anchor Torque
Probe3 Value4
(inch-pounds)
1
-
Rock or hard pan
4000+
-
-
2
GW, GP, SW, SP, GM, SM
Sandy gravel and gravel; very dense and/or cemented
						  sands; coarse gravel/cobbles; preloaded silts; clays and coral.
2000
40+
(6)
3
GC, SC, ML, CL
Sand; silty and; clayey sand; silty gravel; medium
						  dense coarse sands; sandy gravel; and very stiff silt, sand clays.
1500
24-39
351-650
4A
CG, MH2
Loose to medium dense sands; firm to
1000
18-23
276-350
stiff clays and silts; alluvial fills.
4B
CH, MH2
Loose sands; firm clays; alluvial fills.
1000
12-17
175-275
5
OL, OH, PT
Uncompacted fill; peat; organic clays.
(7)
0-11
(5)
Notes:
1. The values
			 provided in this Table have not been adjusted for overburden pressure,
			 embedment depth, water table height, or settlement problems.
2. For soils classified as CH or MH, without
			 either torque probe values or blow count test results, selected anchors must be
			 rated for a 4B soil.
3. The torque
			 test probe is a devise for measuring the torque value of soils to assist in
			 evaluating the holding capacity of the soil in which the ground anchor is
			 placed. The shaft must be of suitable length for the full depth of the ground
			 anchor.
4. The torque value is a
			 measure of the load resistance provided by the soil when subject to the turning
			 or twisting force of the probe.
5.
			 Less than 175.
6. More than
			 550.
7. Refer to 4781-6-03(B)(5).
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(4) The pocket penetrometer and ground auger
			 torque tests shall be completed in accordance with proper test procedures and
			 under proper testing conditions for use with auger style ground anchors;
			 or
(5) If the soil appears to be
			 composed of peat, organic clays, or uncompacted fill, or appears to have
			 unusual conditions, a registered professional geologist, registered
			 professional engineer, or registered architect must determine the soil
			 classification and maximum allowable soil bearing capacity.