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MANUFACTURED HOMES

System Basics
Construction Facts
Prices
Pros
Cons
Statistics
History
Architecture
U.S. Manufacturers
Glossary

Modular homes

Panelized homes

Log homes & Cabins

Precut homes

Steel-frame homes

Timber-frame homes

Cedar homes

Geodesic homes

Round homes

GLOSSARY

ABS
Acrylonitrile butadiene styrene. Plastic material used in the fabrication of footers under manufactured home and stabilizer plates for auguring ground anchors.
Base flood level
Defined by FEMA in 44 CFR, Chapter 1 as the flood level that has a one percent 1% probability of being equaled or exceeded in any given year.
Basement
The portion of a building that is partly or completely below grade.
Chassis
The steel frame that carries the weight of the manufactured home, and is the main structural part enabling transportation of the home. The transportation system includes: drawbar, coupling mechanism, running gear assembly, and lights.
Crawl space
The weight of all materials of construction incorporated into the building, including walls, floors, roofs, ceilings, stairways, built-in partitions, finishes, cladding, and other architectural and structural items and fixed equipment.
Expansive soils
Soils that change volume significantly as their moisture content changes.
FEMA
Federal Emergency Management Agency.
FHA
Federal Housing Administration is a part of U.S. Department of Housing and Urban Development.
Flashing
Material which resists intrusion of moisture into the building.
Floating slab
A type of foundation that generally does not run below the frost line, and is designed to move as a unit without differential settlement or cracking being result of the expansion or contraction of the soil underneath.
Flood plain or flood-prone area
A land area susceptible to being inundated by water from any source.
Floodway
See regulation floodway.
Footers
The parts of a foundation system that actually transmit the weight of the building to the ground.
Grade
The finished ground level adjoining the building at all exterior walls.
HUD
U.S. Department of Housing and Urban Development.
HUD-code home
A home which meets the standards of the U.S. Department of Housing and Urban Development. For newer manufactured homes, these standards are known as the Manufactured Home Construction and Safety Standards.
1-beam
Steel beams, which are shaped like the letter “I,” that provide the main support for manufactured homes and constitute the main structural element of their frames.
Live loads
The loads produced by the use and occupancy of the building or other structure. The live load does not include construction loads and environmental loads such as wind load, snow load, rain load, earthquake load, or dead load.
Marriage or mating wall
The joint between two sections of a double-section or triple-section home.
Penetrometer
An instrument which measures firmness or consistency (as of soil).
Permanent foundation
The U.S. Department of Housing and Urban Development, Federal Housing Administration defines permanent foundation systems as follow:
“Permanent foundations must be constructed of durable materials; i.e. concrete, mortared masonry, or treated wood –and be site-built. It shall have attachment points to anchor and stabilize the manufactured home to transfer all loads, herein defined, to the underlying soil or rock. The permanent foundations shall be structurally developed in accordance with this document [Permanent Foundations Guide for Manufactured Housing] or be structurally designed by a licensed professional engineer for the following:
1. Vertical stability:
a. Rated anchorage capacity to prevent uplift and overturning due to wind or seismic forces, whichever controls. Screw-in soil anchors are not considered a permanent anchorage.
b. Footing size to prevent overloading the soil-bearing capacity and avoids soil settlement. Footing shall be reinforced concrete to be considered permanent.
c. Base of footing below maximum frost-penetration depth.
d. Encloses a basement of crawl space with a continuous wall (whether bearing or non-bearing) that separates the basement of crawl space from the backfill, and keeps out vermin or water.
2. Lateral stability. Rated anchorage capacity to prevent sliding caused by wind or seismic forces, whichever controls, in the transverse and longitudinal directions.”
Piers
Short columns of masonry or steel that provide support between the footing and steel frame of manufactured home.
Psf
Pounds per square foot.
Psi
Pounds per square inch.
Regulatory floodway
The channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than a designated height.
Rim joist
The outermost joist around the perimeter of the floor framing.
Riverine
Relating to, formed by, or resembling a river (including tributaries), stream, brook, etc.
Shear wall
A general term for walls that are designed and constructed to resist racking from seismic and wind by use of masonry, concrete, cold-formed steel or wood framing.
Skirting
Weather-resistant framing and sheeting used to enclose the crawl space of a manufactured home.
Slope
The fall (pitch) of a line of pipe in reference to a horizontal plane. In drainage, the slope is expressed as the fall in units vertical per unit horizontal (percent) for a length of pipe.
Soil test torque probe
Device for drilling into the ground for measuring the resistance of the soil to anchor pull out.
Stabilized plates
Metal or plastic device, typically 8- to 12-in. wide and 12- to 18-in. deep used with ground anchor to resist lateral movement of the head of anchor.
Story above grade
The International Residential Code defines story above grade as “any story having its finished floor surface entirely above grade, except that a basement is considered a story above grade when the finished surface of the floor above the basemen is:
1. More than 6 ft (1829 mm) above grade plane.
2. More than 6 ft (1829 mm) above the finished ground level at any point. 3. More than 12 ft (3658 mm) above the finished ground level at any point.”
Tie downs
Straps or cables attaching the home to ground anchors.
Vapor retarder
A material having a permeance rating of 1.0 or less (ASTME 96).
Vent
A passageway for conveying flue gases from fuel-fired appliance or their vent connectors, to the outside atmosphere.

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