FLOOD02929

• County: Statewide
• Community: na
• Basin: Statewide
• Title: Manufactured Home Installation in Flood Hazard Areas
• Date: 9/1/1985
• Prepared By: FEMA
• Floodplain - Doc Type: Educational/Technical/Reference Information

Table 4.22

NUMBER AND DIAMETER OF BOLTS
AT CONNECTION OF HORIZONTAL BEAMS
TO ROUND VERTICAL MEMBERS

Vertical ~er ~~nu(actured Home
Spacing (U.) Width (ft.) .
1 14
Wind Load - 15 or 2S pst
Roof Live Load = 20 pst
5 3 0 5/8" 3 e. 3/4"
6 303/4" 3 0 3/4"
7 3 e. 3/4" 30.7/8"
8 3 f} 7/8" J e 1/8"
, 307/8" 3 e. I"
10 3 (} 111 3 0 I"
Roof LIve Load = 30 psf
5 3 (} 5/8" 3 C 3/411
6 3 e. 3/4" 3 0 7/8"
7 3 0 7/8" 3 C 7/8"
8 3 0 7/8" 3 a 1"
9 3 a 1" 30. In
10 3 a 111 3 0 1 tl4"
Roof Live Load = 40 pst
5 3 C 5/8" 3 0. 7/8"
6 3 @ 3/4" 3 C 7/811
7 3 C 7/8" .'lOP'
8 3 0 1" 30. JII
9 3 C }1I 3 0 1 1/4"
10 3 0 1 1/4" 3 0 1 1/4"

tain the structural capacity of the vertical member,
notching is not recommended, '
Placement of the bolts at each connection is
critical and from a structural standpoint must meet
the following minimum spacing criteria.
Table 4.23 provides the minimum bolt spacing
distances, as shown in Figure 4.48, as a function
of the required bolt diameter for square vertical
members.
Table 4.24 provides the minimum boll spacing
distances, as shown in Figure 4.49, as a function
of the required bolt diameter for round vertical
members.
Note that in some cases the horizontal beam or
vertical member size may not facilitate the use of
these minimum spacing criteria. In those cases,
the vertical support spacing should be decreased
and additional vertical members included, thereby
distributing the loads over more connections and
allowing the use of smaller, diameter bolls.

Chassis '-Beams
The connection of the chassis I-beams to the
horizontal support beams will be subject to uplift
and lateral loads from wind and flood forces.

Table 4.23
MINIMUM BOLT SPACING DISTANCES
SQUARE VERTICAL MEMBERS
OOLT SIZE/ Dimension (in.) Minirrun Vertical Mi n irrun
(j n.) 8 b 'c e f ~ h MarDer Dimension Beam Depth
(d) (4d) (5<1) ( 7d) (4d) (4d) (4d) (2 1/2d) (2h + b) (e + f + ~)
5/8 2 1/2 3 1/8 4 3/8 2 1/2 2 1/2 2 1/2 I 9/16 6 1/4 7 1/2
3/4 3 3 3/4 5 1/4 3 3 3 I 7/8 7 1/2 9
7/8 3 1/2 4 3/8 6 1/8 3 1/2 3 1/2 3 ,1/2 2 3/16 8 3/4 10 1/2

Table 4.24
MINIMUM BOLT SPACING DISTANCES
ROUND VERTICAL MEMBERS
OOLT SIZE / Dimension (inches) Minimum Vertical Mininun
(j n.) 8 b c e f ~ MaTher Dimens ion Beam Depth
(d) I 1/2d) (4d) (7d) (4d) (4d) (I 1/2d) , (28) (e + 2f + ~)
5/8 I 5/8 2 1/2 4 3/8 2 1/2 2 1/2 15/16 I 7/8 8 7/16
3/4 I 1/8 3 5 1/4 3 3 1 1/8 2 1/4 10 1/8
7/8 I 5 16 3 1/2 6 1/8 3 1/2 3 1/2 I 5/16 2 5/8 II 13/16
I I 1/2 4 7 4 4 I 1/2 3 13 1/2
I 1/4 I 7/8 5 8 3/4 5 5 I 7/8 3 3/4 16 7/8

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