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§ 1585.04
<br />DWELLING HOUSE CODE
<br />1585.04 Firestopping in partitions.
<br />Hollow partitions of any material shall be
<br />firestopped to cut off air spaces within the
<br />partitions from open spaces within the floor
<br />or ceiling construction. Where stud parti-
<br />tions rest directly over each other and the
<br />studs run down between the joists and rest
<br />on the top plate of the partition below, the
<br />spaces between the studding at .the joist
<br />level shall be firestopped.
<br />1585.05 Firestopping in stairs.
<br />Where stairs are finished on the underside
<br />so as to create a concealed. open space be-
<br />tween the stringers, the space between the
<br />stair stringers shall be firestopped at least
<br />once in the middle portion of each run and
<br />by a header beam at-top and bottom. Where
<br />such a stair run is not all in one room or
<br />where a closet is located beneath the stairs,
<br />the intermediate firestop between the stair
<br />stringers shall be located so as to cut off
<br />communication between portions of the
<br />stairs in different rooms, or between the
<br />closet and the room in which it is placed.
<br />1585.06 Firestopping of breezeways.
<br />Where dwellings and a garage are con-
<br />nected with a breezeway, the junction of the
<br />garage and the breezeway shall be fire-
<br />stopped.
<br />1585.07 Firestopping at pipes or ducts.
<br />Where any pipe or duct passes through a
<br />floor, the space between the pipe or duct
<br />and the floor construction shall be firestopped
<br />with noncombustible material or closed off
<br />with noncombustible collars on each side of
<br />the opening. Where the installation of pipes,
<br />ducts, or conduits in walls, floors, or parti-
<br />tions requires the removal of any firestop-
<br />ping, the spaces around the pipes, ducts, or
<br />conduits at points where firestopping was
<br />removed shall be tightly filled with noncom-
<br />bustible material, as prescribed in Section
<br />1559.19.
<br />1585.08 Firestopping around sliding doors. .
<br />Where sliding doors are pocketed in par-
<br />titions, such pockets shall be firestopped at
<br />the top, bottom, and ends.
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<br />1585.09 Firestopping around chimneys and
<br />ducts.
<br />Spaces around chimneys and ducts shall
<br />be firestopped as specified in Section 1559,19.
<br />1585.10 Inspection of firestopping.
<br />No firestopping shall be concealed frLom
<br />view until inspected and approved by the
<br />Building Official.
<br />1585.11 Walls near lot line.
<br />In buildings except private garages, an ex-
<br />terior wall which is less than 3 feet distance
<br />from the lot line along an adjoining area shall
<br />be of noncombustible construction having a
<br />fire-resistance rating of not less than 2 hours;
<br />except that the material of the weather sur-
<br />face may be similar to that of other exterior
<br />walls of the building.
<br />1585.12 Separation walls.
<br />In 2-family dwelling houses of side-by-side
<br />arrangement, the basement or cellar party
<br />wall separating the two dwelling units shall
<br />be constructed of masonry having a mini-
<br />mum thickness of 6" for cast-in-place .con-
<br />crete, 8" for solid masonry units or other
<br />assemblies .having fire-resistance rating of
<br />not less than 2 hours, Not less than 4" of
<br />solid masonry or dense noncombustible ma-
<br />terial shall separate all wood members fram-
<br />inginto such masonry walls. Above the first
<br />floor level in such double dwellings, the walls
<br />separating the dwelling units shall have a
<br />fire-resistance rating of not less than 1 hour.
<br />Such walls shall extend to the underside of
<br />the roof sheathing.
<br />1585.13 Furnace clearances.
<br />Except as otherwise provided in Chapter
<br />91, heating furnaces and boilers shall be
<br />mounted on floors of fireproof construction,
<br />or semi-fireproof construction with noncom-
<br />bustible flooring and surface finish, extend-
<br />ing not less than one foot at sides and rear
<br />and 1i/z feet at front. Unless furnaces and
<br />boilers are approved for installation with
<br />lesser clearance, the minimum distance to
<br />woodwork or other combustible construction
<br />shall be 6" at the top, sides and rear and 48"
<br />at the front, except that with gas burners;
<br />the clearance maybe 18" in front.
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<br />TITLE NINE-DESIGN REQUIREMENTS
<br />CHAPTER 39. DESIGN LOADS AND PERFORMANCE
<br />REQUIREMENTS.
<br />1539.01 Scope.
<br />The provision of this chapter shall govern
<br />the assumption for dead, live and other loads
<br />in the design of dwelling houses and acces-
<br />sory buildings.
<br />139.02 Design investigation.
<br />The design investigation determining
<br />stresses and deflections shall consider any
<br />probable critical condition of loading. An-
<br />chorage of roofs and floors to walls, columns,
<br />and bearing partitions and of walls and col-
<br />umns to foundations, shall be provided to
<br />resist lifting forces and to prevent any slid-
<br />ing or overturning.
<br />1539.03 Allowable stresses.
<br />The design of any part of a structure shall
<br />be such as not to exceed the allowable
<br />stresses prescribed in Chapters 41 through
<br />47 for materials constituting the structural
<br />members, or shall satisfy the load test re-
<br />quirements of this chapter.
<br />1539.04 Permissible deflection.
<br />When the interior is finished with plaster
<br />or other materials having similar inelastic
<br />properties, the deflection of floor and ceiling
<br />joists and other structural members shall
<br />not exceed 1/360 of the clear span. When
<br />other surface treatment is used, which in the
<br />opinion of the Building Official is sufficiently
<br />elastic, the deflection shall not exceed 1/240
<br />of the clear span.
<br />1539.05 Acceptable spans.
<br />Span lengths of woad structural members
<br />of any particular species and grade of ma-
<br />terial shall not exceed those set forth for
<br />such species and grade in Tables of Maxi-
<br />mum Allowable Spans f or Wood Floor Joists,
<br />Ceiling Joists, Rafters, in Residential Con-
<br />struction, Federal Housing Administration,
<br />FHA-2550.
<br />1539.06 Dead loads.
<br />In estimating for the purpose of design,
<br />dead loads shall include the actual weight of
<br />materials, construction and all fixed installa-
<br />tions, including plumbing stacks and risers,
<br />heating, ventilating and air conditioning
<br />equipment, wherever carried by structural
<br />members. In the absence of definite informa-
<br />tion, values .approved by the Building Of-
<br />ficial shall be used.
<br />1539.07 Concentrated loads.
<br />The uniform loads set forth in the follow-
<br />ing Sections 1539.08 through 1539.13 do not
<br />include unusual concentrations such as
<br />heavy equipment, storage units, bookshelves
<br />or automobile wheel loads on other than
<br />ground supported slabs. Where such loads
<br />may occur, the structural members and
<br />flooring shall be designed to support-
<br />1. The prescribed uniformly distributed
<br />live loads, or
<br />2. The contemplated concentrated loads
<br />plus one-half the prescribed uniformly dis-
<br />tributed live loads, whichever produce the
<br />greater stress.
<br />1539.08 Live loads for floors.
<br />The minimum live load for the design of
<br />floors shall be 40 psf, except that for upper
<br />floors of single family dwellings, the load
<br />shall be not less than 30 psf in designing the
<br />floor system for flexure.
<br />1539.09 Attic live loads.
<br />(a) Attic accessible by stair. When an
<br />attic is made accessible by a permanent or
<br />disappearing stair, the floor system of the
<br />attic shall be designed so as to support a
<br />live load of not less than 30 psf in areas
<br />where the attic ceiling height is 3 feet or
<br />more. In areas where the ceiling height is
<br />less than 3 feet, the design of the floor system
<br />shall be based on.a live load of not less tl}an
<br />20 psf.
<br />(b) Scuttle or hatchway area exceeding
<br />400 sq. in. When access to an attic is not by
<br />means of a stair but the entrance area ex-
<br />ceeds 400 square inches, "light attic storage"
<br />may be assumed. and the floor system shall be
<br />designed for a live load of not less than 20
<br />psf.
<br />(c) Scuttle area 400 sq. in. or less. When
<br />access to an attic is not by means of a stair
<br />and the entrance area is 400 square inches or
<br />less, "no attic storage" may be assumed and
<br />the floor system designed for dead load only,
<br />but not less than 11 psf.
<br />1539.10 Live loads for stairs and railings.
<br />Stairs shall be capable of supporting safely
<br />a live load of 60 psf, Railings for stairways,
<br />platforms or decks, both exterior and in-
<br />terror, shall be designed to resist a horizontal
<br />thrust of 50 lbs. per linear foot applied
<br />transversely at the top of the railing.
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