[Ord. No. 08-06 §4, 12-30-2008]
A.
A certain document, three (3) copies of which one (1) copy is on file in the office of the Cass County Clerk and the remaining two (2) copies may be maintained in the Building Codes office of the County of Cass, Missouri, being marked and designated as the Pole and Post Framed Buildings, be and is herby adopted as the Building Code of the County of Cass in the State of Missouri for the control of building and structures as herein provided; and each and all of the regulations, provisions, penalties, conditions and terms of said Building Code are hereby referred to, adopted and made a part hereof, as if fully set out in this Article, with the additions, insertions, deletions and changes, if any, prescribed in Subsection (B) hereof and Section 500.020 of this Chapter.
B.
The following Sections are hereby revised:
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POST FRAME BUILDING STANDARDS.
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1.
201.3 SCOPE. The provisions of this Section
shall apply to the design and construction of post frame buildings
or additions thereto, intended for agricultural or residential accessory
uses on tracts of property that are zoned for residential or agricultural
uses. The provisions of this Article are deemed to comply with the
spirit and intent of the minimum design and construction provisions
of the 2006 Edition of the International Building Code.
2.
201.3.1 LIMITATIONS. Buildings designed and
constructed under these provisions shall not exceed limitations of
this Section.
Buildings that exceed the limitations of Sections 201.3.1.1
through 201.3.1.6 shall be designed in accordance with requirements
of the 2006 Editions of the International Building Code by a registered
Missouri structural engineer to practice in the design of buildings.
3.
201.3.1.1 AREA. Buildings shall not exceed
3,000 square feet in area.
4.
201.3.1.2 HEIGHT. The sidewall height of buildings
designed under these provisions shall not exceed 14 feet or one (1)
story in height.
5.
201.3.1.3 BUILDING DIMENSIONS. The maximum
width dimension of a building designed under these provisions shall
not exceed 40 feet.
6.
201.3.1.4 BRACED WALL. Buildings shall be provided
with exterior braced walls. Bracing shall be located in the sidewalls
at each corner by means of a nominal 2 inch by 4 inch diagonal brace
or other approved bracing.
7.
201.3.1.5 OPENINGS IN EXTERIOR WALLS. No single
opening for doors, windows or other purposes that exceed 16 feet in
width shall be placed in exterior walls.
Buildings that are open on one (1) side shall have posts embedded
2 feet deeper than the depth required by Section 201.3.3.3 or shall
be provided with an acceptable brace for wind resistance.
8.
201.3.1.6 EXIT REQUIRED. At least one (1) exit
door complying with this Section shall be provided. Exit doors shall
be of the pivoted or side hinged swinging type. The exit door opening
shall be of a size to permit the installation of a door not less than
3 feet (914 mm) in width and not less than 6 feet 8 inches (2,032
mm) in height. The exit door shall be openable from the inside without
the use of a key or any special knowledge or special effort.
9.
BRACED WALL
BUTT ENCASED
FOOTING
GIRT
POLE OR POST
PURLIN
201.3.2 DEFINITIONS:
Is a wall that has been provided with diagonal bracing which
meets the requirements of Section 201.3.1.4 of this code.
Is concrete encasement of a pole or post at the lower 12
inches of its embedment in the earth.
Is that portion of the foundation that spreads and transmits
loads directly to the soil.
Is the horizontal wall framing members that span between
posts and are used to support the exterior wall covering.
Is a preservatively treated round, square or rectangular
wood member, that is solid sawn or laminated and is intended to be
embedded in the ground to support building structural loads and transmit
the loads to the footing.
Is the structural members that span between rafters or trusses
used to attach and support metal roof coverings and transfer the roof
loads to the rafters or trusses.
10.
LIVE LOAD
DEAD LOAD
WIND LOAD
201.3.3 FOUNDATION AND POST REQUIREMENTS.
201.3.3.1 ROOF LOADS.
The roof snow load shall be 20 pounds per square foot.
The roof dead load shall be 4 pounds per square foot for
roofs that utilize a metal roof covering. Dead Loads of 7 pounds per
square foot shall be used if wood shakes, wood shingles or asphalt
composition shingles are utilized. If other roof coverings are used,
the loading specified by the roof covering manufacturer shall apply.
Buildings designed and constructed under these provisions
shall be considered to be designed for a 90 mph wind located in an
exposure C wind zone.
11.
201.3.3.1.1 FOUNDATION DESIGN. Foundations
for buildings designed and constructed under provisions of these requirements
shall be designed and installed in accordance with this Section. Foundations
shall be designed to support the imposed load and be capable of resisting
wind uplift and overturning. The loading requirements that shall be
applicable for buildings designed and constructed under these provisions
shall be as specified in this Section.
12.
201.3.3.2 FOUNDATION DIAMETER. The diameter
of holes for pole or post foundations and the required footing thickness
shall be in accordance with Table 201.3.3.2. Footings shall be placed
to a depth so that building loads are supported on natural undisturbed
soils. Unless unusual site conditions exist, soil-bearing capacity
shall be assumed to have a 2,000 p.s.f. bearing capacity.
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TABLE 201.3.3.2
MINIMUM FOOTING DIMENSIONS
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Building Width
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Post Spacing
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Footing Thickness
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Footing Diameter
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24
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8 to 10 feet
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8 inches
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15 inches
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30
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8 to 10 feet
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8 inches
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17 inches
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36
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8 to 10 feet
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8 inches
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18 inches
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40
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8 to 10 feet
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8 inches
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18 inches
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13.
201.3.3.3 POLE OR POST EMBEDMENT. Poles or
posts shall be embedded in the earth to a minimum depth of 4 feet
(1,219 mm).
14.
201.3.3.3.1 SHALLOW POLE OR POST EMBEDMENT.
When it is necessary to use a pole or post embedment depth of less
than 40 inches but not less than 30 inches due to rock or other local
site conditions, knee bracing shall be provided and the post foundation
hole shall be backfilled to grade with concrete. Embedment depth of
less than 30 inches is not allowed under this standard.
15.
201.3.3.4 BACKFILL. Footings of concrete or
other approved materials shall be placed under poles or posts. Footings
shall have a minimum thickness in accordance with Table 201.3.3.2.
Posts shall be either butt encased with concrete or be fully embedded
with concrete or be provided with other approved means to provide
for resistance to wind uplift. If posts are provided with butt encasement
or blocked anchors, the remaining annular space of the post foundation
holes shall be backfilled by firmly tamping clean soil or sand in
maximum 8 inch layers.
16.
Figures.
See Figure 1(a) through (c) for examples of allowed methods
of providing uplift resistance and backfilling post holes.
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Figure 1 a through c
Examples of Post Embedment
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Figure (a)
Butt-Cased
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Figure (b)
Blocked Anchor
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Figure (c)
Full Concrete Casement
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17.
201.3.3.5 CONCRETE PLACEMENT. Concrete used
for footings or post encasement shall be placed as wet mix or dry
mix.
18.
201.3.3.6 POLE OR POST ANCHOR. Poles or posts
shall be anchored to the encasing concrete, whether butt encased or
fully encased, with a minimum ½ inch reinforcing bar placed
through a drilled hole in the pole or post. The rebar shall have a
minimum one (1) inch of concrete cover from the bottom and top of
the encasing concrete.
Blocked anchors shall be provided when the backfill of the annular
space consists of earth, sand or gravel tamped in 8 inch layers. Blocked
anchors shall be of the same dimension as the base of the post.
19.
201.3.3.7 POLE OR POST SIZE AND SPACING. Poles
or posts may be solid sawn or laminated. Poles or posts shall be of
a minimum dimension as required by Table 201.3.3.7 based upon the
building height and spacing of posts. The spacing of poles or posts
shall not exceed the maximum shown in Table 201.3.3.7 for the dimension
of post that will be used.
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WOOD SUBJECT TO DECAY OR TERMITE DAMAGE
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20.
201.3.3.8 WOOD EMBEDDED IN GROUND OR CONCRETE. Wood embedded in the ground or in direct contact with the earth
and used for the support of permanent structures shall be treated
for ground contact. Wood supporting permanent structures that are
embedded in concrete in direct contact with earth or embedded in concrete
exposed to the weather shall be treated for ground contact. Wood which
is in contact with the ground shall be treated for ground contact.
All treated wood shall bear a stamp from an approved agency identifying
the treatment retention of the member.
NOTE: It is recommended that any wood that
is embedded in the earth or embedded in concrete that is in direct
contact with the earth be pressure preservatively treated to a retention
level of 0.6 pounds per cubic foot in accordance with AWPA Standard
C22.
21.
201.3.3.9 WOOD IN CONTACT WITH THE EARTH OR SUBJECT
TO WATER SPLASH. Wood that is in contact with the ground
or is located within 18 inches of the ground surface shall be pressure
preservatively treated or wood of natural resistance to decay and
termites.
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TABLE 201.3.3.7
POST SIZE AND SPACING REQUIREMENTS
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|---|---|---|---|---|
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EFFECTIVE BUILDING HEIGHT IN FEET1
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8
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10
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12
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14
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POST SIZE2
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POLE OR POST SPACING IN FEET
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SOLID SAWN
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3.0 x 5.5
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7
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6
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4
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4
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4 x 4 Nominal
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7
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6
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4
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4
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4 x 6 Nominal
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15
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12
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9
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8
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6 x 6 Nominal
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15
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15
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15
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15
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2 — 2 x 6 Laminated
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7
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6
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4
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4
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3 — 2 x 6 Laminated
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15
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14
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10.5
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10
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4 — 2 x 8 Laminated
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16
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16
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16
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16
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1 For roof slopes 4:12 or less, the
effective height is the vertical distance from grade level to the
eave. For roof slopes greater than 4:12, the effective building height
is the vertical distance from grade level to the eave, plus one-half
of the roof height.
2 The larger post dimension shall
be in the same direction of the building width.
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22.
201.3.4 GIRT FRAMING. When siding is to be
attached to the exterior walls of pole or post framed buildings, wall
girts shall be installed. Wall girts shall be of a minimum size for
the span as required by Table 201.3.4.
GIRT NAILING. Girts shall be fastened to the
posts using 16 d-ring shank hot dipped galvanized nails or other approved
fasteners.
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Table 201.3.4
WALL GIRT SPANS
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Girt Span
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8 feet
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10 feet
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12 feet
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2X4 24 inches O.C.
2X6 36 inches O.C.
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2X6 36 inches O.C.
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2X6 36 inches O.C.
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23.
201.3.4.1 BRACING. Exterior sidewalls shall
be braced at building corners. Braces shall be minimum 2X4 nominal
dimension lumber installed diagonally or be of other approved bracing
materials.
24.
201.3.4.2 HEADERS AND BEAMS. Headers or beams
required to support building loads shall be designed to safely carry
the imposed loads.
25.
201.3.4.3 BEAM SUPPORT. Beams, headers or girders
that are used to support roof framing shall be supported by notches
in the poles or posts and shall be secured by ½ inch diameter
bolts secured with washers and nuts or ½ inch by 4½
inch lags.
26.
201.3.4.4 FASTENERS. Fasteners for pressure
preservatively treated wood and fasteners used in locations exposed
to weather shall be of hot-dipped zinc galvanized, aluminum alloy
wire fasteners or stainless steel fasteners.
27.
201.3.4.5 EXTERIOR WALL COVERING. Exterior
wall coverings, when provided, shall be of an approved weather-resistant
material. Steel panel exterior wall coverings shall be of minimum
29 gauge.
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ROOF CEILING CONSTRUCTION
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28.
201.3.5 GENERAL. Roof framing may be of conventional
light frame construction as allowed by Chapter 23 of the International
Building Code, 2006 Edition or may be of trusses as specified by Section
201.3.5.1 of this code or may be of other alternate designs that have
been designed by a professional engineer licensed by the State of
Missouri.
29.
201.3.5.1 TRUSSES. Trusses may be site built
or be shop fabricated. Trusses shall be designed by a professional
engineer licensed by the State of Missouri to practice in the design
of buildings.
30.
201.3.5.2 CONVENTIONAL FRAMING. The framing
details for conventional roof construction shall conform to the requirements
of Chapter 23 of the International Building Code, 2006 Edition.
31.
201.3.5.2.1 ROOF-MEMBERS-TO-BUILDING-FRAME-TIE Blocking-straps, approved framing anchors or mechanical fasteners
shall be installed from the side of the roof-framing member to the
exterior post or other supporting members.
Tie straps shall be 1⅛ inch (28.6 mm) by 0.036 inch (0.91
mm) (No. 20 gauge) sheet steel and shall be corrosion resistant.
32.
201.3.5.3 PURLINS. Purlins shall be installed
with the wide dimension perpendicular to the load that it supports.
Purlins shall be supported on top of the trusses or shall be provided
with approved hangers. The span of purlins shall not exceed the values
specified in Table 201.3.5.3.
33.
201.3.5.4 CEILINGS. When finished ceilings
are to be installed, the trusses or ceiling joist shall be designed
to carry the imposed loads. When ceilings are to be framed in accordance
with the conventional light frame provisions of Chapter 23 of the
International Building Code 2006 Edition.
34.
201.3.5.5 ROOF COVERING. The roof covering
shall be of an approved material as specified by Chapter 15 of the
International Building Code, 2006 Edition.
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TABLE 201.3.5.3
PURLIN SPANS
(Based on purlin spacing of 24 inches center to center)
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GRADE
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DIMENSION
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MAXIMUM SPAN (feet)
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#1
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2 x 4
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8' 6"
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2 x 6
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12' 3"
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2 x 8
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15' 9"
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#2
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2 x 4
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8'
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2 x 6
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12'
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2 x 8
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15'
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#3
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2 x 4
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6'
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2 x 6
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9'
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2 x 8
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11'
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FPN: The spans given in this table are based
upon use of Spruce-Pine-Fir design values. Spans may vary depending
on the lumber species which is used.
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