HomeMy WebLinkAboutNotes, Work PLANNER 1/7/2013 0 2010 Oregon Manufa Dwelling Installation Specialty Code 1
-, 10, 3-2.2 Special Snow Load Conditions. 3-2.4 Flood Hazard Areas. When manufactured
Manufactured dwellings designed for and dwellings are installed in flood hazard areas they
located in areas with roof live loads greater than shall be elevated and anchored according to the
30 PSF shall be installed to the manufacturer's Oregon Residential Specialty Code, Section
installation instructions or designed by a R324.1.8.
1 shat•squat: registered design professional. 3-2.5 Seismic Design Categories. To identify
r, an. 3-2.3 Wind Resistant Anchoring. To resist the different levels of earthquake activity, three (;.
overturning, sliding and lateral movement, seismic design categories have been 11,
neso ,
manufactured dwellings shall be anchored to established in Oregon. See Figure 3 2.5(a).
resist the design wind loads in Section 3-1.5 I
according to the requirements in Section 3-2.6.
signe. C9L1B1" I
cu,9oP
1141, IOSHINCTON HOOD 1,1
,nt the d.
u..An u •
eezin „�„�: '""�""
lace, Yww ".'°"
place.
POLK
UNCOLN i WARE:INN I
e fro- J I
Code ;' .• ` ,.-; -i :
su ate. coal =SEISMIC CATEGORY D, 1 1
wlriEUa
sulate. � """"EY =SEISMIC CATEGORY D,
aboV; =SEISMIC CATEGORY C
>pecifi, CURRY i
K�,..,,�,
s, sit: y, ,C„
ipertie.. J�''
-ed. A i '
syste THE BOUNDARY OF SEISMIC DESIGN CATEGORY D., IN DOUGLAS AND LANE COUNTIES IS
TH i
desig AT LAND WHICH LIES WESTERLY OF RANGE 10 WEST OF THE WILLAMLIIt MERIDIAN. •
IJASC: Figure 3-2.5(a) Seismic Design Category Map
Wall 3-2.5.1 Seismic Design Category C. 3-2.5.2 Seismic Design Category D1.
)s sha Manufactured dwellings in seismic design Manufactured dwellings in seismic design
le 3-2. category C shall comply with the following. See category D1 shall comply with the following. See
]rego Figure 3-2.5(b). Figure 3-2.5(b).
I.2(1). . (1) Manufactured dwellings shall be limited in (1) Manufactured dwellings shall be limited in
th height to 3 ft. as measured from the top of height to 3 ft. as measured from the top of
the footing to the bottom of the main frame the footing to the bottom of the main frame
for 75 percent of the under-floor area. for 75 percent of the under-floor area.
lumbia, (2) Manufactured dwellings shall be limited in (2) Manufactured dwellings shall be limited in
H
height to 5 ft. — 7 in. as measured from the height to 5 ft. — 7 in. (67 in.) as measured
)ton, top of the footing to the bottom of the main from the top of the footing to the bottom of
frame for 25 percent of the under-floor area. the main frame for 25 percent of the under-
cson(1), (3) The fuel gas supply to the manufactured floor area.
iah, dwelling shall be made with a minimum 6 ft. (3) The fuel gas supply to the manufactured
pod flexible gas connector. dwelling shall be made with a 6 ft. flexible
Aorrow, (4) The maximum height limitations identified in gas connector.
iwa, this section may be exceeded when the (4) If the home exceeds 3 ft. from the top of the
support system is designed for the footing to the bottom of the I-beam, the
appropriate seismic design category by a manufactured dwelling shall be braced or
ckson registered design professional, or the anchored to resist overturning, sliding, and
manufacturer's DAPIA approved plans, and lateral forces according to ecti n 3-2.5.4.
accepted by the building official.
Date Received=
Planner: LM 15
4
2010 Oregon Manufaclwelling Installation Specialty Code III
(5) The maximum height limitations identified in the footing to the bottom of the main frame
this section may be exceeded when the for 25 percent of the under-floor area.
support system is designed for the (3) The fuel gas supply to the manufactures
appropriate seismic design category by a dwelling shall be made with a 6 ft. flexible
registered design professional, or the gas connector.
manufacturer's DAPIA approved plans, and
accepted by the building official. (4) If the home exceeds 2 ft. from the top of the
footing to the bottom of the I-beam, the
3-2.5.3 Seismic Design Category D2. manufactured dwelling shall be braced or
Manufactured dwellings in seismic design anchored to resist overturning, sliding, anc
category D2 shall comply with the following. See lateral forces according to Section 3-2.5.4.
Figure 3-2.5(c). (5) The maximum height limitations identified in
(1) Manufactured dwellings shall be limited in this section may be exceeded when the
height to 2 ft. as measured from the top of support system is designed for the
the footing to the bottom of the main frame appropriate seismic design category by a
for 75 percent of the under-floor area. registered design professional, or
(2) Manufactured dwellings shall be limited in manufacturer's DAPIA approved plans. and
height to 5 ft. as measured from the top of accepted by the building official.
._______N_��--- ------------------0-
NN1� ��������������
..�
Iii r1 ffr I----
- 1-1 111 i f u n .�
.I FRAME
■■ . a • i ; ; 36 in.
67 in. a • •W
� ; MAX.
MAX. ,, "11 ■ %/' i vi iI iIrije■i ij>i g /
. : �f�%.,/i\\,;',0"/�
�,,,-----4,,,,,—,...—*\ PIERS SHOWN ARE MAIN FRAME SUPPORT PIERS, ;
�e �\�\\ PERIMETER AND MARRIAGE UNE PIERS ARE NOT
• SHOWN FOR CLARITY OF THE ILLUSTRATION.
NOT MORE THAN 25% OF 75% OF UNDER-FLOOR AREA PIERS SHALL
UNDER-FLOOR AREA PIERS BE A MAXIMUM OF 36 in. IN HEIGHT
SHALL BE OVER 36 in. IN HEIGHT
•
Figure 3-2.5(6) Maximum Pier Height for Seismic Zone C & D,
r -.....m............JAMINM E
•___a_________Ns.- _����������1
r...11Vl11"IllWIHii w' __..N...ma1
OD 1_,
- I - l I _OD i�I [ - >4
F.,,.
60 in. a `
i ac • �' ..I MAX
X.
MAX. E. a ` U /fyl`!/`//`//`/I'//`/% Il//'/ /�%// `//yy'h'%'%%6�/i
a e: 4-. �j:-,7l�) \\1.,..,\\\\\\\\\\\\\\%4\ 1\.\\\O'\\ i. ,
-Tr—\,��;\\r\-.�.4",; f.�i\IN\\N"`e/NY MITE:
�`i✓i\.i\•,Zokr'FN.- �l. PIERS SHOWN ARE MAIN FRAME SUPPORT PIERS.
PERIMETER AND MARRIAGE UNE PIERS ARE NOT
SHOWN FOR CLARITY OF THE ILLUSTRATION.
-r '-
NOT MORE THAN 25% OF 75% OF UNDER-FLOOR AREA PIERS SHALL
UNDER-FLOOR AREA PIERS BE A MAXIMUM OF 24 in. IN HEIGHT
SHALL BE OVER 24 in. IN HEIGHT
Figure 3-2.5(c) Maximum Pier Height for Seismic Zone 2' i _.
Date Received:
Planner: LM
16
2010 Oregon Manufactured Dwelling installation Specialty Code
in frame 3-2.5.4 Earthquake-ResisS Bracing. When the ancho1 equipment shall be made
I. required, manufactured dwellings shall be according to the equipment manufacturer's
ifacture, anchored or braced to resist seismic forces by instructions.
flexibl: any of the following: (b) Foundation footing U-Bar anchoring ties
(1) Installing an approved earthquake-resistant shall be sized and the U-Bars spaced
)p of th_ bracing system. according to the manufacturer's instructions.
am, the (2) Installing an approved anchoring system The mechanical connections of the
aced o designed to resist seismic conditions. anchoring ties shall be made according to
ing, any (3) Installing positive connection piers at the the equipment manufacturer's instructions,
2.5.4. main frame and anchoring with approved (A) In the absence of manufacturer's
lified i ground anchors. instructions, the U-Bar attachments shall be
hen th- (4) Supporting and securing to a foundation installed 11 ft. on center and no more than
for th_ wall, basement wall, or positive connection 12 in. from each end on both sides of the
ry by a piers. manufactured dwelling.
)l, o (5) Supporting and securing to an approved (B) Tie materials and strapping shall be capable
ins, ans. structural skirting system designed to resist of resisting an allowable working load of
seismic conditions. 3,150 lbs. with no more than two percent
(6) elongation, and shall withstand a 50 percent
6} Supporting and securing to a foundation
overload. Tie-downs and ground anchors
system capable of resisting seismic forces shall have protection against weather
designed by a registered design professional deterioration and corrosion at least
and approved by the building official. equivalent to that provided by a coating of
3-2.6 Anchoring. Anchoring of a manufactured zinc on steel of .30 oz./ft2 of surface coat.
dwelling shall be according to the following.
(c) Connector Plate anchoring:
(1) The initial installation of all new (A) At least 3-1/2 in. x 7 in., 20 gage connector
manufactured dwellings shall be according to plates no more than 12 in. from each end on
one of the following methods: both sides and 4 ft. on center for single wide
(a) Installation of approved ground anchors that dwellings, and 5 ft. on center for multiple
comply with all the requirements for Wind section dwellings.
Zone I in 24 CFR 3285.402 contained within (B) Plates shall be fastened with a combined
the manufacturer's installation instructions. total of 32 8d nails into the rim joist and
(b) Structural attachment to a foundation foundation wall top plate.
system, structural skirting, basement wall, or (d) Plywood trim board anchoring:
footing when designed by a registered A Exterior type 15/32 in. grade B plywood professional and approved by the ( } yp 9 p ywood at
I
building official. See Section 3-2.6(2)(b) and least 3-1/2 in. wide and continuous on both
Figure 3-2.6 for examples of a typical sides of the dwelling.
approved anchoring systems. (B) Trim board shall be secured to the rim joist
and the foundation wall top plate with 8d
( ) An earthquake-resistant bracing system shall nails 6 in. on center in each row and caulked
be installed at a maximum of 24 ft. on center for weather seal.
and have a capacity of at least 5,000 lbs. in
the lateral and longitudinal directions and
35,000 lbs. vertically, and are limited for use
with multisection manufactured dwellings
only having a roof slope of 20 degrees or
less and supported on piers not greater than
24 in. in height.
(2) The secondary installation of a manufactured
€ dwelling shall be according to one of the
following methods, see Figure 3-2.6:
i(a)
Ground anchors shall be sized and spaced
according to the equipment manufacturer's J
instructions. The mechanical connections of Date Received: l `�
Planner: LM
17
BUILDING PLANNING Ili III
I 2.4. Openings shall be not less than 3 inches (76 direction of wave approach, where parallel
mm)in any direction in the plane of the wall. shall mean less than or equal to 20 degrees
2.5. Any louvers,screens or other opening covers (0.35 rad)from the direction of approach,or
shall allow the automatic flow of floodwaters 1.2. Located at the base flood elevation plus 1 foot
into and out of the enclosed area. (305 mm), or the design flood elevation,
2.6. Openings installed in doors and windows,that whichever is higher, if the lowest horizontal
meet requirements 2.1 through 2.5, are ac- structural member is oriented perpendicular
ceptable;however,doors and windows with- to the direction of wave approach,where per-
out installed openings do not meet the pendicular shall mean greater than 20 degrees
requirements of this section. (0.35 rad)from the direction of approach.
R322.2.3 Foundation design and construction. Founda- 2. Basement floors that are below gradeon all sides are
tion walls for all buildings and structures erected in flood prohibited.
hazard areas shall meet the requirements of Chapter 4. 3. The use of fill for structural support is prohibited.
Exception:Unless designed in accordance with Section 4. Minor grading,and the placement of minor quantities
R404: of fill, shall be permitted for landscaping and for
1. The unsupported height of 6-inch(152 mm)plain drainage purposes under and around buildings and for
masonry walls shall be no more than 3 feet (914 support of parking slabs,pool decks,patios and walk-
mm). ways.
2. The unsupported height of 8-inch(203 mm)plain Exception: Walls and partitions enclosing areas
masonry walls shall be no more than 4 feet(1219 below the design flood elevation shall meet the
mm). requirements of Sections R322.3.4 and R322.3.5.
3. The unsupported height of 8-inch(203 nun)rein- 8322.33 Foundations.Buildings and structures erected in
forced masonry walls shall be no more than 8 feet coastal high-hazard areas shall be supported on pilings or
(2438 mm). columns and shall be adequately anchored to those pilings
For the purpose of this exception, unsupported or columns.Pilings shall have adequate soil penetrations to
height is the distance from the finished grade of the resist the combined wave and wind loads(lateral and uplift).
under-floor space and the top of the wall. Water loading values used shall be those associated with the
design flood.Wind loading values shall be those required by
R322.3 Coastal high-hazard areas (including V Zones).
this code. Pile embedment shall include consideration of
Areas that have been determined to be subject to wave heights
decreased resistance capacity caused by scour of soil strata
in excess of 3 feet(914 mm)or subject to high-velocity wave
surrounding the piling.Pile systems design and installation
action or wave-induced erosion shall be designated as coastal shall be certified in accordance with Section R322.3.6.Mat,
high-hazard areas. Buildings and structures constructed in raft or other foundations that support columns shall not be
whole or in part in coastal high-hazard areas shall be designed permitted where soil investigations that are required in
and constructed in accordance with Sections R322.3.I through accordance with Section R401.4 indicate that soil material
R322.3.6. under the mat,raft or other foundation is subject to scour or
8322.3.1 Location and site preparation. erosion from wave-velocity flow conditions. Slabs,pools,
1. New buildings and buildings that are determined to be pool decks and walkways shall be located and constructed
substantially improved pursuant to Section to be structurally independent of buildings and structures
R105.3.1.1,shall be located landward of the reach of and their foundations to prevent transfer of flood loads to
mean high tide. the buildings and structures during conditions of flooding,
scour or erosion from wave-velocity flow conditions,unless
2. For any alteration of sand dunes and mangrove stands the buildings and structures and their foundation are
the building official shall require submission of an designed to resist the additional flood load.
engineering analysis which demonstrates that the pro-
posed alteration will not increase the potential for 8322.3.4 Walls below design flood elevation.Walls and
flood damage. partitions are permitted below the elevated floor,provided
R322.3.2 Elevation requirements. that such walls and partitions are not part of the structural
support of the building or structure and:
I. All buildings and structures erected within coastal 1. Electrical,mechanical,and plumbing system compo-
high hazard areas shall be elevated so that the lowest nents are not to be mounted on or penetrate through
portion of all structural members supporting the low walls that are designed to break away under flood
est floor, with the exception of mat or raft founda-
tions, piling, pile caps, columns, grade beams and loads;and
bracing,is: 2. Are constructed with insect screening or open lattice;
1.1. Located at least 1 foot(305 mm)above the de- or
sign flood elevation, if the lowest horizontal , 3. Are designed to break away or collapse without caus-
structural member is oriented parallel to the ' 1 ing collapse,displacement or other structural damage
3-42
Date Received: 2011 OREGON RESIDENTIAL SPECIALTY CODE
Planner: LM
BUILDING PLANNING 0 S
SECTION R320 percent (100-year flood) or greater chance of being
ACCESSIBILITY equaled or exceeded in any given year,or
1 R320.1 Scope. Dwelling units required to be accessible by 2. The elevation of the design flood associated with the
ORS 447.231 shall comply with Chapter 1 l of the Building area designated on a flood hazard map adopted by the
Code as applicable. local jurisdiction,or otherwise legally designated.
R322.1.4.1 Determination of design flood elevations.
SECTION R321
If design flood elevations are not specified,the building
ELEVATORS AND PLATFORM LIFTS oicial is authorized to require the applicant to:
1. Obtain and reasonably use data available from a
R321.1 Elevators.Where provided,passenger elevators,lim- federal,state or other source;or
ited-use/limited-application elevators or private residence ele-
vators shall comply with ASME A17.1. 2. Determine the design flood elevation in accor-
dance with accepted hydrologic and hydraulic
R321.1.1 Permits. Pursuant to the Elevator Safety Laws, engineering practices used to define special flood
ORS Chapter 460, an application,plan review and permit hazard areas. Determinations shall be undertaken
for elevators,dumbwaiters,vertical and inclined wheelchair by a registered design professional who shall doc-
lifts,and stairway chair lifts,installed in private residences, ument that the technical methods used reflect cur-
must be obtained from Building Codes Division,Elevator rently accepted engineering practice. Studies,
Safety Program(ORS 460.035). analyses and computations shall be submitted in
R321.2 Platform lifts. Where provided, platform lifts shall sufficient detail to allow thorough review and
comply with ASME A18.1. approval.
II R3213 Accessibility. Elevators or platform lifts in covered R322.1.4.2 Determination of impacts.In riverine flood
multifamily dwellings shall comply with Chapter 11 of the hazard areas where design flood elevations are specified
> Building Code. but floodways have not been designated, the applicant
shall demonstrate that the effect of the proposed build-
ings and structures on design flood elevations,including
SECTION R322 fill, when combined with all other existing and antici-
FLOOD-RESISTANT CONSTRUCTION pated flood hazard area encroachments,will not increase
the design flood elevation more than 1 foot(305 mm)at
R322.1 General. Buildings and structures constructed in any point within the jurisdiction.
whole or in part in flood hazard areas(including A or V Zones)
I I as identified by the local jurisdiction shall be designed and con- R322.1.5 Lowest floor.The lowest floor shall be the floor
structed in accordance with the provisions contained in this of the lowest enclosed area,including basement,but exclud-
section. ing any unfinished flood-resistant enclosure that is useable
solely for vehicle parking,building access or limited storage
Exception:Buildings and structures located in whole or in provided that such enclosure is not built so as to render the
part in identified floodways shall be designed and con- building or structure in violation of this section.
structed in accordance with ASCE 24.
R322.1.6 Protection of mechanical and electrical systems.
R322.1.1 Alternative provisions.As an alternative to the Electrical systems,equipment and components;heating,ven-
requirements in Section R322.3 for buildings and structures blaring,air conditioning;plumbing appliances and plumbing
located in whole or in part in coastal high-hazard areas(V fixtures;duct systems;and other service equipment shall be
Zones),ASCE 24 is permitted subject to the limitations of located at or above the elevation required in Section R322.2
this code and the limitations therein. (flood hazard areas including A Zones) or R322.3 (coastal
R322.1.2 Structural systems.All structural systems of all high-hazard areas including V Zones).If replaced as part of a
buildings and structures shall be designed, connected and substantial improvement,electrical systems,equipment and
anchored to resist flotation, collapse or permanent lateral components; heating, ventilating, air conditioning and
I I movement resulting from hydrodynamic and hydrostatic plumbing appliances and plumbing fixtures; duct systems;
loads and stresses,including the effects of buoyancy. and other service equipment shall meet the requirements of
8322.13 Flood-resistant construction.All buildings and this section. Systems, fixtures, and equipment and compo-
nents shall not be mounted on or penetrate through walls
structures erected in areas prone to flooding shall be con- intended to break away under flood loads.
structed by methods and practices that minimize flood dam-
age. Exception: Locating electrical systems,equipment and
R322.1.4 Establishing the design flood elevation. The components; heating, ventilating, air conditioning;
sys-
design flood elevation shall be used to define areas prone to plumbing appliances and plumbing fixtures; duct sys-
g p terns;and other service equipment is permitted below the
flooding. At a minimum,the design flood elevation is the elevation required in Section R322.2(flood hazard areas
higher of: including A Zones)or R322.3(coastal high-hazard areas
1. The base flood elevation at the depth of peak eleva- including V Zones)provided that they are designed and
lion of flooding(including wave height)which has a 1 installed to prevent water from ente ' or ccumulating
3-40 20081W8CSIN4
E
Planner: LM
0110 41111 BUILDING PLANNING
within the components and to resist hydrostatic and National Flood Insurance Program(NFIP)incorporated in I
hydrodynamic loads and stresses,including the effects 423 U.S.C.40001-4128.
of buoyancy, during the occurrence of flooding to the 1. Buildings and structures in flood hazard areas not
design flood elevation in accordance with ASCE 24. designated as Coastal A Zones shall have the lowest
Electrical wiring systems are permitted to be located floors elevated at least 1 foot above the design flood
below the required elevation provided they conform to elevation.
the provisions of the Electrical Code for wet locations.
2. Buildings and structures in flood hazard areas desig-
R322.1.7 Protection of water supply and sanitary sew- nated as Coastal A Zones shall have the lowest floors
age systems.New and replacement water supply systems elevated to or above the base flood elevation plus 1
• shall minimize or eliminate infiltration of flood waters into foot (305 mm), or to the design flood elevation,
the systems in accordance with the plumbing provisions of whichever is higher.
this code. New and replacement sanitary sewage systems ' 3. In areas of shallow flooding (AO Zones),buildings
• shall minimize or eliminate infiltration of floodwaters into and structures shall have the lowest floor(including
systems and discharges from systems into floodwaters in basement)elevated at least as high above the highest
> accordance with the plumbing provisions of this code. adjacent grade 1 foot above as the depth number
specified in feet on the FIRM,or at least 3 feet(915
R322.1.8 Flood-resistant materials. Building materials mm)if a depth number is not specified.
used below the elevation required in Section R322.2(flood
hazard areas including A Zones)or R322.3 (coastal high- 4. Basement floors that are below grade on all sides
hazard areas including V Zones)shall comply with the fol- shall be elevated at least 1 foot above the design flood
lowing: elevation.
1. All wood, including floor sheathing, shall be pres- Exception:Enclosed areas below the design flood eleva-
lion, including basements whose floors are not below
sure-preservative-treated in accordance with AWPA
grade on all sides,shall meet the requirements of Section
Ul for the species,product,preservative and end use
or be the decay-resistant heartwood of redwood, R322.2.2.
black locust or cedars.Preservatives shall be listed in 5. The finished ground level of an under-floor space
Section 4 of AWPA Ul. such as a crawl space shall be equal to or higher than
2. Materials and installation methods used for flooring the outside finished ground level.
and interior and exterior walls and wall coverings Exception: Under-floor spaces that meet the
shall conform to the provisions of FEMA/FIA-TB-2. requirements of FEMA/FIA-TB-11.
R322.1.9 Manufactured homes. New or replacement R322.2.2 Enclosed area below design flood elevation.
manufactured homes shall be elevated in accordance with Enclosed areas,including crawl spaces,that are below the
Section R322.2 or Section R322.3 in coastal high-hazard design flood elevation shall:
areas(V Zones).The anchor and tie-down requirements of 1. Be used solely for parking of vehicles, building
Sections AE101 and AE102 of Appendix E shall apply.The access or storage.
foundation and anchorage of manufactured homes to be
located in identified floodways shall be designed by a regis 2. Be provided with flood openings that meet the fol-
lowing design professional and constructed in accordance lowing criteria:
with ASCE 24. 2.1. There shall be a minimum of two openings on
different sides of each enclosed area; if a
R322.1.10 As-built elevation documentation. A regis- building has more than one enclosed area be-
tered design professional shall prepare and seal documenta- low the design flood elevation,each area shall
Lion of the elevations specified in Section R322.2 or R322.3. have openings on exterior walls.
R322.2 Flood hazard areas(including A Zones).All areas 2.2• The total net area of all openings shall be at
that have been determined to be prone to flooding but not sub-
ject to high velocity wave action shall be designated as flood foot(0.093 m2)of enclosed area,or the open-
hazard areas.Flood hazard areas that have been delineated as ings shall be designed and the construction
subject to wave heights between 11/2 feet(457 mm)and 3 feet documents shall include a statement by a reg-
(914 mm)shall be designated as Coastal A Zones.All building istered design professional that the design of
and structures constructed in whole or in part in flood hazard the openings will provide for equalization of
areas shall be designed and constructed in accordance with hydrostatic flood forces on exterior walls by
Sections R322.2.1 through 8322.2.3. allowing for the automatic entry and exit of
floodwaters as specified in Section 2.6.2.2 of
•
R322.2.1 Elevation requirements. For the purposes of ASCE 24.
Section R322,required elevations shall be a minimum of 1 2.3. The bottom of each openi g shall be 1 foot
foot (305 mm) above the design flood elevation unless (305 mm) or less ahoy ground
increased by the local jurisdiction under the authority of Received:, 7a/7i
Planner LM
2011 OREGON RESIDENTIAL SPECIALTY CODE 3-41