CHAPTER 7 - FINAL CHECK

**700. GENERAL.** Design values determined for the foundation sizes and
detailing, that have been derived using procedures in the preceding
chapters, will now be summarized. Follow the procedure near the end of
the Design Worksheet of Appendix F for assembling relevant foundation
information.

**700-1. BEARING AREA AND VERTICAL ANCHORAGE.**

**A.** **Pier Footings and Piers under Chassis Beams.**

1\. Determine the area required for pier footings by comparing two
values:

a\. The Required Effective Footing Area (Aftg).

b\. The Required Footing Area to resist overturning and uplift from
withdrawal capacities found in Appendix C, where required.

2\. Select the largest of the above two values. This value will
determine the Pier Footing Size. The size and spacing of anchor bolts
and the selection of reinforcing bar size, lap splice length, and
reinforcing bar hook length for the piers has already been determined.
The depth of the footings for frost and for withdrawal (where required)
has also been determined. Bring these values forward.

**B. Pier Footings and and Piers under Marriage Walls.** Marriage walls
only occur in multi-section units. Their piers only carry gravity loads
and never participate in uplift or sliding. There are two pier
situations that may occur at marriage walls: (1) the marriage wall is
continuous without openings, or (2) there are locations where large
openings in the marriage wall are intended to enlarge a room's space.

1\. Where marriage walls are continuous: determine the area required for
pier footings by using one value:

a\. The Required Effective Footing Area (Aftg) for marriage wall piers
from the multi-section unit Foundation Design Tables in Appendix B.

b\. The piers are assumed equally spaced under the continuous portion of
the wall.

2\. Where marriage walls have a large opening: determine the area
required for piers at the ends of the opening by using one value:

a\. The Required Effective Footing Area (Aftg) for marriage wall piers
from the bottom of each multi-section unit Foundation Design Table in
Appendix B by using the length of the opening.

b\. These piers are located at the ends of the opening directly under
the posts that support the beam at the top of the opening.

**C. Longitudinal Foundation Wall Footings and Longitudinal Foundation
Walls.**

1**.** Determine the correct footing size for longitudinal foundation
walls, Types E & I, by comparing two values:

a\. The Required Effective footing width (Aftg).

b\. The Required footing width to resist uplift and overturning from the
withdrawal capacities found in Appendix C, where required.

2**.** Select the largest of the above two values and use it as the
appropriate footing size.

3**.** The foundation system brought forward can either be wood,concrete
or masonry.

4\. Bring forward values for the wall and footing as follows:

a\. Depth of footing

b\. Reinforcing bar size

c\. Lap splice length

d\. Reinforcing bar hook length

e\. Size and spacing of anchor bolts

f\. Treated wood foundation nailing requirements

**700-2. HORIZONTAL ANCHORAGE IN THE TRANSVERSE DIRECTION: TRANSVERSE
FOUNDATION WALLS.**

**A. Transverse Foundation Walls: Exterior (at unit ends) and Interior
(to Underside of Chassis).**

1\. The number of transverse walls, wall footing sizes, anchorage
requirements and foundation wall reinforcement have been determined to
resist sliding, based on capacities found in Appendix C. Bring all these
values forward where continuous transverse foundation walls are used.

2\. The foundation system brought forward can either be wood, concrete
or concrete masonry.

**B. Transverse Foundation Walls Completed with Diagonal Braces.**

1\. Connection sizes and anchorage requirements have been determined.
Bring these values forward where transverse foundation walls are
completed with diagonal braces.

2\. The foundation wall system brought forward can be only concrete or
masonry. The galvanized steel diagonal straps connect to the top of
chassis beams under the unit and to the top of masonry or concrete wall
option selected.

**C. Vertical X-Bracing Planes in Lieu of Walls.** This applies only to
Concept Design Types **C1**, **C2**, **E1**, **E3** and **E4** for
either single or multi-section units.

1\. Number, spacing and detailing information has been determined. Bring
these values forward where vertical X-bracing planes are used.

2\. The foundation system brought forward can be only galvanized steel
diagonal straps connected to the top of chassis beams under the unit and
to the top of concrete footings.

**700-3 HORIZONTAL ANCHORAGE IN THE LONGITUDINAL DIRECTION: LONGITUDINAL
FOUNDATION WALLS.**

**A. Longitudinal Exterior Foundation Walls - Type E or I Units.**

1\. Connection sizes and anchorage requirements have been determined
based on capacities found in Appendix C. Bring these values forward
where longitudinal exterior foundation walls are used.

2\. The foundation system brought forward can be wood, concrete or
masonry.

**B. Vertical X-Bracing Planes under Chassis Beam Lines-Type C Units
Only.**

1\. Number, spacing and detailing information has been determined. Bring
these values forward where vertical X-bracing planes are used.

2\. The foundation system brought forward can by only galvanized steel
diagonal straps connected to the bottom of chassis beams under the unit
and to the top of concrete footings.

**701. FINAL APPROVAL.** All considerations important in the
installation of the manufactured home should have been checked. If
answers fall within the boundaries of this document, the foundation may
be approved.