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

To account for this, the vertical member length
, used for the purpose of determining an acceptable
design must be increased, This vertical member
length is used in Section B of this chapter in deter,
mining the size of the vertical member needed to
carry anticipated loading,
For example, consider an area where a
manufactured home is to be placed on a six foot
high foundation using eight inch posts, If the an-
ticipated flood velocity was six fps, the scour depth
from Table 4,5 is 30 inches, For the purpose of
determining the necessary post length, the scour
depth of 30 inches would be included in the ver-
tical member length as shown in Figure 4,16,

Design Loads
Design loads (roof live, wind, dead, floor live)
which are over and above those caused by
flooding, must also be considered in that any
elevated foundation design must be capable of
also withstanding these loads, The magnitude of
these loads is shown in Tables 4,6 to 4,9 and will
be used in the evaluation of elevated foundation
design strategies, Note that roof live loads and
wind loads are not additive, Hence, the elevated
foundation design must be based on the greater
of these loads,

..
H

~

6'.0'

,.

11'-0'

~~":

6'-0'

2'-6'

Figure 4.16 Addition of Scour Depth

Table 4.6
BUILDING LOADS (pounds)
12 Foot Wide Manufactured fkme
Lo thUeet)1
32 5
Roo! LJve2
:ZOps! 9520 11760 14000 15120 16240 17360 19040 20720
30 psf 14280 17640 21000 22680 24360 26040 28560 31080
40pse 19040 23520 28000 30240 32480 34720 38080 41HD
DeadJ 7680 9600 11520 120180 13440 14400 15840 17280
Floor
Llve4 15360 1920D 23040 24960 26880 28800 31680 34560
WindS
(Lateral)
15 pst 4680 58S0 7020 7605 8190 8775 9653 10550
25 pst 7800 9750 11700 12675 1365014625 16088 17550
Wlnd6
(lplitt)
9ps! 5526 6750 7974 8586 9198 9810 10728 11646
ISps! 9210 11250 1329014310 1533016350 17880 19410

I. Length refers to the "box" lengtll of the manufactured home.

2. Roof live l08.ds based upon roof area including a one foot roof eave
around tile manufactured home perimeter.

3, Dead loads based upon gross floor area and 20 pst design load.

4. Floor live loads based upon gross noor area and 400 psf design load.

5. Wind loads Oatera]) based upon windward IOlIgitucUnal wall area
(9.75' x length') and stated wind foree.

6, Wind loads (uplift) based upon roof area Including a one foot eave
around the manufactured home perimeter. A 2.5 wind load factor
is applied to the one foot eave.

Table 4.7
BUILDING LOADS (pounds)
14 Foot Wide iIo1anufactllred Home
Len Ih (teet)1
J2 .. 48 " " 60 " 72
Roof Live2
:ZOps! 10880 13440 16000 17280 18560 19840 21760 23680
30 pst 16320 20160 24000 25920 27840 29760 32640 35520
40 pst 21760 26880 32000 34560 37120 39680 43520 41360
Dead3 8960 11200 13440 14560 15680 16800 18480. 20160
Floor
Live'" 17920 22400 26880 29120 31360 33600 36960 40320
WindS
(Lateral)
15psf 4680 5850 7020 1605 8190 8715 9653 10530
25 psI 1800 9150 lI100 12615 13650 14625 16088 17550
Wind6
(tpllrt)
9psf 6192 7560 8928 9612 10296 10980 12006 13032
15 psI 10320 12600 14880 16020 17160 18300 20010 21120

I. Length refers to the "box" length of the manufaetured borne.

1. Roof live l08.ds based upon roof area inchidlng a one foot roof eave
around the manufactured borne peri meter.

3. Dead l08.ds based upon gross floor area and 20 psf design load.

4. Roor live loads based upon gross Door area and 40 psf design load.

a. WInd 108.d9 o.ateral) based upon windward longitudinal wall area
(9.75' x length') and stated wind force.

S. Wind 10lld9 (uplltt) based upon roof area including a one toot eave
arolmd the manufactured bome perimeter. A 2.5 wind load factor
is applied to the one foot eave.

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