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§ 1565.08
<br />DWELLING .HOUSE CODE
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<br />cellar floors are not more than 3 feet below
<br />finish grade, and shall increase 4 inches in
<br />thickness for each additional 2 feet in depth.
<br />Beam and girder bearings shall consist of
<br />solid masonry not less than 4 inches in height
<br />or a bearing plate of material and design
<br />satisfactory to the Building Official.
<br />1565.08 6" concrete foundation walls.
<br />Foundation walls of plain concrete shall be
<br />not less than 6 inches in thickness when sup-
<br />porting one-story masonry structures or
<br />woad-frame or light-metal-frame structures
<br />less than two stories high; except that in no
<br />case shall 6 inch plain concrete foundation
<br />walls be used where the basement or cellar
<br />floor is more than 4 feet below the adjacent
<br />ground level.
<br />1565.09 - 8" reinforced masonry walls.
<br />Foundation walls, 8 inches thick, of rein-
<br />forced concrete or reinforced brick masonry
<br />may be used where the cellar floor is not
<br />more than 8 feet below the adjacent ground
<br />level. Far depths greater than 8 feet, the
<br />walls shall be designed in a manner approved
<br />by the Building Official.
<br />1565.10 Lateral stability.
<br />When determined by the Building Official
<br />to be necessary because of the character of
<br />the soil or other local conditions, all founda-
<br />tion walls below grade and all retaining
<br />walls shall be strengthened with buttresses,
<br />reinforcing steel and/or additional wall
<br />thickness to resist lateral soil or hydrostatic
<br />pressure; and the foundation slabs and other
<br />footings subjected to water pressure shall be
<br />designed to resist a uniformly distributed
<br />uplift equal to the full hydrostatic pressure.
<br />In the absence of actual design data, the
<br />reinforcement of 8 inch concrete basement
<br />walls supported laterally at the top and bot-
<br />tom, shall consist of not less than 1/z inch
<br />round verticals. spaced 12" o.c, and. i/z inch
<br />round horizontals spaced 24" o,c.
<br />1565.11 Piers.
<br />Free standing piers may be used for one-
<br />story frame dwellings' only. Masonry pier
<br />sizes shall be not less than 8 inches by 16
<br />inches or 12 inches by 12 inches; poured con-
<br />crete piers shall have a minimum size of 10
<br />inches by 10 inches square or 12 inches in
<br />diameter if round. Piers shall extend a mini-
<br />mum distance above grade of 8" and hollow
<br />masonry units shall be capped with at least
<br />6 inches of solid masonry or concrete. Ex-
<br />terior wall piers supporting floor joists shall
<br />be not more than 8 feet on centers. Exterior
<br />wall piers in line parallel to joists and in-
<br />terior piers shall have a spacing of not more
<br />than 12 feet on centers. The maximum
<br />height of exterior wall piers above grade
<br />shall be four times the least dimension of
<br />the pier, except when supported laterally
<br />by masonry or concrete curtain walls. Maxi-
<br />mum unsupported height of interior piers
<br />of plain concrete or solid masonry units
<br />shall be 10 times their least dimension.
<br />1565.12 Curtain walls.
<br />Curtain walls, 33/4" minimum thickness,
<br />between piers and supported on concrete
<br />footings poured integrally with pier footings
<br />may be used for wood frame and masonry
<br />veneered woad frame construction one or
<br />more stories in height.
<br />CHAPTER 67. EXTERIOR WALLS OF. CONVENTIONAL
<br />WOOD FRAME.
<br />1567.01 Studs.
<br />(a) Conventional construction. The con-
<br />ventional exterior walls of wood frame con-
<br />struction shall be composed of studs, not less
<br />than 2 x 4's set with the larger dimension in
<br />the direction of the wall thickness and with
<br />maximum spacing of 16 inches o.c. for all
<br />two-story constructions. All studs, whether
<br />1-story or 2-story lengths, shall be continuous
<br />lengths without splicing.
<br />(b) Balloon frame. In the balloon frame
<br />construction, the maximum length of studs
<br />shall be 20 feet. The second floor joists shall
<br />be supported on 1 x 4 ribbon or ledger boards
<br />notched into the inside edge of studs and
<br />nailed to each stud with not less than two
<br />lOd common nails. Joists shall be nailed to
<br />studs with five lOd common or three 16d
<br />common nails. Where there are ceiling or
<br />other floor joists above to take thrust. of
<br />rafters not less than two lOd common nails
<br />shall be used.
<br />(c) Less than two stories. For dwellings
<br />less than two-stories high, the spacing of
<br />studs shall be determined by the type of
<br />interior finish when walls are sheathed aiid
<br />by the type of exterior or interior finish
<br />when walls are not sheathed, in accordance
<br />with the requirements of Chapter 79.
<br />1567.02 Corner construction.
<br />Corner posts of dwellings shall be not less
<br />than three 2 x 4's set in a manner acceptable
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<br />Prefabricated Homes
<br />1553.03 Direct fired heating appliances
<br />located fn garage buildings.
<br />No heating furnace or other direct fired
<br />heating appliance, other than unit heaters
<br />located at least 8 feet above the floor, shall
<br />be located in a garage building having an
<br />area less than 600 sq. ft. Such heating ap-
<br />pliance shall be located in a room used for
<br />§ 1555.05
<br />no other purpose and cut off from the garage
<br />area by noncombustible construction hav-
<br />ing afire resistance rating of not less than 3
<br />hours. Openings in the above mentioned cut-
<br />offs shall be restricted to those necessary for
<br />heating pipes and ducts. Such heating equip-
<br />ment and enclosure shall not draw air for
<br />combustion from the garage area and in
<br />other respects shall comply with Chapter 91.
<br />CHAPTER 55. PREFABRICATED HOMES.
<br />1555.01 Scope.
<br />It is the intent of this chapter to provide
<br />minimum requirements for prefabricated
<br />homes and assemblies prefabricated off the
<br />site or at the site of construction, provided
<br />such assemblies and the completed structure
<br />conform to the provisions of this Dwelling
<br />House Code and otherwise satisfy the re-
<br />quirements of Commercial Standard CS 125
<br />for one-, one-and-a-half-, and two-story pre-
<br />fabricatedhomes.
<br />1555.02 Definition.
<br />® A prefabricated home is one having walls,
<br />partitions, floors, ceilings, and/or roof com-
<br />posed of sections or panels of varying sizes
<br />which have been fabricated prior to erection
<br />on the building foundation, in contrast to
<br />the conventionally built home which is con-
<br />stru~ted piece by piece on the site.
<br />1555.03 Structural design.
<br />Where the size and spacing of framing
<br />members or materials are in conflict with or
<br />not covered by this Dwelling House Code,
<br />they will be acceptable if the assembly meets
<br />the load requirements of Chapter 39, and the
<br />assembly conforms to the requirements as
<br />set forth under Sections 1555.04 and 1555.05.
<br />1555.04 Approval based on design.
<br />When capable of design by accepted en-
<br />gineering analysis, any prefabricated struc-
<br />tural element or combination of elements
<br />shall be approved by the Building Official
<br />provided the design is based on the working
<br />loads and allowable stresses established by
<br />this Dwelling House Code. When a system
<br />of construction involves unusually intricate
<br />design analysis, the Building Official may
<br />base his approval . on tests as set forth in
<br />Section 1555.05 or, with the applicant's writ-
<br />ten approval, he may retain the services of a
<br />competent expert at the applicant's expense
<br />to determine whether or not the construction
<br />conforms to the requirements of this Dwell-
<br />ing House Code.
<br />1555.05 Approval based on tests.
<br />(a) Design not readily analyzed by mathe-
<br />matics. When not capable of design by ac-
<br />cepted engineering analysis, the manufac-
<br />turer of the proposed prefabricated construc-
<br />tion shall file with the Building Official,
<br />duplicate copies of a certificate from an ac-
<br />creditedtesting laboratory, which states that
<br />tests have been made on identical prefabri-
<br />cated construction, and showing the certified
<br />test results together with a detailed physical
<br />description of the panel, assembly or unit
<br />tested,
<br />(b) Static test procedure. Panels, assem-
<br />blies or units tested shall sustain test loads
<br />equal to two times the live load plus the
<br />dead load applied for a period of 24 hours or
<br />short-time test loads equal to 21/4 times the
<br />live and dead loads. Recovery within 24
<br />hours, after removal of the test load, shall be
<br />not less than 75 per cent of the observed de-
<br />flection. When subjected to the design live
<br />load, the measured deflection of panel, as-
<br />semblies or elements tested shall not exceed
<br />1/360 of the clear span for plastered sur-
<br />faces or 1/240 of the clear span for dry wall
<br />construction.
<br />(c) Accelerated tests. In the absence of
<br />records of experience for new materials, sat-
<br />isfactory to the Building Official, he may
<br />require accelerated tests on the prefabri-
<br />cated assemblies or materials to determine
<br />the durability, weather resistance, and safety
<br />of the structure, comparable to equivalent
<br />conventional construction, or he may accept
<br />certified reports of an accredited testing
<br />laboratory in respect thereto.
<br />(d) Field splices and connections. All
<br />field splices and connections of floor, wall,
<br />ceiling and roof subassemblies shall be of
<br />sufficient strength to sustain 13/4 times the
<br />normally applied load without apparent
<br />separation, and so constructed as to insure
<br />weather tightness in exterior wall and roof
<br />surfaces,
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