Building
Code Comparison
Highlighted
provisions indicate which code has the stricter
fire/safety standards.
|
Design Element
|
HUD
Manufactured Housing Standards
|
International Residential
Code ***
|
|
|
FIRE SAFETY |
|
|
Exit doors |
Two @ 28 in
(min) width
Must be 20 ft apart (min)
3280.105 (a) & (2) |
One @ 36 in width
R 311.4.2 |
|
Specific exit door location relationship
to bedrooms |
Yes
3280.105 |
None |
Window height in bedroom
from floor to opening of window |
36 in (max)
3280.106(b) |
44 in (max)
R 310.1 |
|
Bedroom egress window opening size |
24 in (min) high clear
opening
20 in (min) width clear opening |
22 in (min) high clear opening
20 in (min) width clear opening
R 310.1.2 & 310.1.3 |
|
Required window area |
5 sq ft (min) |
All egress openings min.
5.7 sq. ft.
R 310.1.1 |
|
Hallways |
28 in wide (min)
3280.112 |
36 in wide
R 311.3 |
|
Smoke Alarms |
Yes
3280.208(b) |
Yes
R 313.1 |
|
|
Flame spread |
|
|
Walls |
200 flame spread rating
3280.203(1) |
200 flame spread rating
R 315.1 |
|
Ceilings |
75 flame spread rating
3280.203(2) |
200 flame spread rating
R 315.1 |
|
Furnace, water heater & cooking area |
Special protection with
gypsum
25 flame spread
3280.203(3) |
Minimum clearances specified
Lesser clearance allowed with protective materials,
unless under a stairway |
|
Flame spread of plastic bathtubs, shower
units and tub or shower doors |
200 flame spread rating
3280.203(6) |
Shall comply with ANSE
Z 124.1-95 & 124.2-95 |
|
|
ELECTRICAL |
|
|
Requirements based on National Electric
Code |
Yes
3280.801 NEC NFPA 70 2005 |
Yes
NEC NFPA 70 2005 |
|
Required listed materials and devices |
Yes
3280.801(d) |
Yes
NEC 110.2 |
|
Aluminum wire in branch circuits |
Not permitted
3280.801(e) |
Permitted
NEC 310.2(b) |
|
Receptacle location |
Comparable
3280.806 |
Comparable
NEC 210.52-210.63 |
|
Load Circulations |
Comparable
3280.804 |
Comparable
NEC 210.23 |
|
Separate neutral and ground circuits on
branch circuit wiring and panel board(s) for range and
dryer |
Yes
3280.806 |
Yes
NEC 220.52 (a & b) |
|
Electric disconnecting means required at
panel board |
Yes |
No |
|
Single disconnecting means required at
sub-panel board |
Yes |
No |
|
Tests required on all parts |
Yes
3280.810 |
No
NEC 550.17 |
|
|
PLUMBING |
|
|
Water supply piping |
Plastic allowed (CPVC or PEX)
3280.604 |
Plastic allowed (CPVC or PEX)
UPC 301.1.1 |
|
Drain-waste-vent piping |
Plastic allowed (PVC or ABS)
3280.610 |
Plastic allowed
UPC 701.1 |
|
Venting of plumbing fixtures |
Wet venting and anti-siphon (mechanical
vents) permitted in addition to required direct venting
3280.611(2 & 3) |
Wet venting permitted only for fixtures
located vertically above lower fixture
UPC 908.1 |
|
Material |
National accepted standards
3280.603 |
National accepted standards and Building
Official approvals
UPC 301.2 |
|
Test and inspections |
Water systems, drainage and
fixtures are tested
3280.612 |
Water systems, drainage vent
systems and fixtures are tested
UPC 103.5.3 |
|
|
STRUCTURAL DESIGN |
|
|
Moisture in framing lumber |
Kiln dried lumber
required 19% max. moisture content 3280.304 |
Green lumber permitted
R 802.1.3.4 (Not over 28%) |
|
Roof live load |
20 PSF (min) Depends on design zone
3280.305 (4)(c) |
25 PSF (min) Depends on
county and elevation
Table R 301.6 |
|
Wind load (horizontal) |
15 PSF (min) Depends on design zone
3280.305 |
20 PSF (min) when less
than 49 ft high Depends on county and elevation
R 301 |
|
Wind load (vertical) |
9 PSF (min) Depends on design zone
3280.305 |
20 PSF
R 301 |
|
Floor live load |
40 PSF
3280.305 (g) |
40 PSF (min) Dwelling area
See Chapter 5 |
|
Horizontal load on interior walls |
5 PSF
3280.305 (f)(2) |
See Chapter 6
|
|
Roof trusses |
Engineered and Tested |
Engineered only
R 802.10.2 |
|
|
LOAD DEFLECTION |
|
|
Floors |
L/240 Span (max)
3280.305 |
1/360 Span (max)
Table R 502.3.1 (1 & 2) |
|
Roof and ceiling |
L/180 Span (max)
3280.305 |
1/240 Span (max)
Table R 802.4.1 |
|
Walls |
L/180 Span (max)
3280.305 |
See Chapter 6 wall const. |
|
Plans and Specifications |
Engineered
3280.303 (B) |
Layman-if using conventional framing
methods
R 106 (Const. Doc.) |
|
|
ARCHITECTURAL DESIGN
BUILDING PLANNING |
|
|
|
Minimum Room Sizes |
|
|
One living area |
150 square feet
3280.109 (a) |
120 square feet
R 304.1 |
|
Double bedroom |
70 square feet
3280.109.2 |
70 square feet
R 304.2 |
|
Single bedroom |
50 square feet
3280.109.2 |
70 square feet
R 304.2 |
|
Room width |
5 ft (min)
3280.110 |
7 ft (min)
R 304.3 |
|
Room height |
7 ft 0 in (min) (exceptions)
3280.104 |
7 ft 0 in. (min)
R 304.3 |
|
Hallway height |
6 ft 6 in (min)
3280.104(b) |
7 ft. 0 in. (min)
R 305 |
|
Closet depth |
22 in (min)
3280.109(c) |
Not specified |
|
|
Light and Ventilation |
|
|
Glazed area |
8% (min) gross floor area of room
3280.103(a) |
8% of habitable room floor area
R 303.1 |
|
Ventilation area |
4% (min) gross floor area of room
3280.103(b) |
4% (min) gross floor area of room
R 303.1 |
|
Mechanical |
Habitable; .35 air changes per hour
3280.103(b) |
Mechanical ventilation (optional)
0.35 air changes per hour
R 303.1 |
|
Ventilation |
Bath 50 cfm
3280.103(C)(3) |
Bath 50 cfm
Table 1506.3 |
|
Ventilation to improve indoor air quality
above minimum standard |
Required |
None specified |
|
Formaldehyde emission control |
Required |
Not specified |
|
|
Attic Ventilation |
|
|
Fraction of floor area |
1/300 (min)
3280.504(c) |
1/150 (min) reduction
possible
R 806.2 |
|
|
THERMAL ENERGY
CONSERVATION |
|
|
Moisture control (vapor barrier) |
Yes
3280.504 (all) |
Yes
R 1104.9 |
|
Walls |
Yes
3280.504(b) |
Yes
R 1104.1 |
|
Ceiling |
Yes
3280.504(a) |
Variable
R 1104.1 |
|
Floor |
Specified
3280.504 |
Yes
R 1104.1 |
|
Air infiltration control |
Specified
3280.505 |
Specified
R 1104.8 |
|
Double glazing or storm windows |
Specified |
R 1104.1 |
|
Design basis for heating (winter) |
70 F (max)
3280.506 & 3280.510 |
Standard
R 1103.1 |
|
Thermal insulations |
Performance standard |
Prescriptive performance
R 1104 |
|
|
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