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§ 1539.11
<br />DWELLING HOUSE CODE
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<br />1539.11 Reduction of live loads.
<br />Girders, columns, bearing walls and foot-
<br />ings which carry 100 square feet or more of
<br />floor area shall be designed to support the
<br />dead load of floor, ceiling, and partition con-
<br />structions, plus the combined dead and live
<br />load of the roof, plus 65 per cent or more of
<br />the assumed live loads on floors and ceilings.
<br />1539.12 Wind loads on exterior walls.
<br />Exterior walls of dwelling houses shall be
<br />capable of withstanding a horizontal load of
<br />not less than 15 psf acting inward or out-
<br />ward.
<br />1539.13 Wind and snow loads for roofs.
<br />(a) Roofs, either flat or pitched, with
<br />angles of slope up to and including 4 in 12
<br />shall be designed to withstand a vertically
<br />inward load of not less than 30 psf of hori-
<br />zontal projection.
<br />(b) Pitched roofs with slopes greater than
<br />4 in 12 shall be designed to withstand a ver-
<br />tically inward load of not less than 20 psf of
<br />horizontal projection.
<br />(c) Roofs, either flat or pitched, shall be
<br />designed to withstand an outward and up-
<br />ward load of not less than 19 psf normal to
<br />the roof surface.
<br />1539.14 Y.oad test.
<br />The Building Official may require a load
<br />test on any design or assembly whenever the
<br />material or methods of construction differ
<br />from those customarily used and the load-
<br />bearing capacity thereof may not be subject
<br />to determination by customary and accepted
<br />methods of mathematical analysis or cal-
<br />culation. Load tests shall be made in ac-
<br />cordance with ASTM E 72, where applicable,
<br />or conducted as prescribed in subsection
<br />1539.15 (b), except that tests on any concrete
<br />or masonry construction. shall be made not
<br />less than 48 days or more than 61 days after
<br />fabrication. The applicant shall pay the cost
<br />of all required tests.
<br />1539.15 Performance requirements.
<br />(a) When structural assemblies or ele-
<br />ments are tested by an accredited testing
<br />laboratory and in accordance with ASTM E
<br />72, or such part of said ASTM E 72 as deter-
<br />mined necessary by the Building Official,
<br />each assembly shall meet the structural
<br />requirements of Performance Standards
<br />issued by the Housing and Home Finance
<br />Agency or, when permitted by the Build-
<br />ing Official, the assembly or structure
<br />shall be subjected to a proof load equal to
<br />the dead loads plus twice the live loads pre-
<br />scribed in Sections 1539.06 to 1539.13 in-
<br />clusive. The loads shall be applied in incre-
<br />ments of not more than 20% of the proof
<br />load. When the applicant desires to apply
<br />test loads greater than the proof load, the
<br />additional increments shall be of similar
<br />magnitude. The deformation and set shall
<br />be recorded for each increment of loading.
<br />The results of all tests shall be tabulated and
<br />also plotted on graphs as load-deformation
<br />and load-set data.
<br />1. The criteria for acceptance of structural
<br />assemblies or elements in any of the tests
<br />prescribed in ASTM E 72 shall be as fol-
<br />lows:
<br />i. There shall be no evidence of struc-
<br />tural failure at or below the proof load;
<br />and
<br />ii. In the transverse loading test, when
<br />subjected to ~/z the proof load, the de-
<br />flection shall not exceed 1/360 of the clear
<br />span for masonry assemblies or other types
<br />to be finished with plaster or materials
<br />having similar inelastic properties, or
<br />1/240 of the clear span for assemblies with
<br />surface treatments which in the opinion of
<br />the Building Official have sufficiently
<br />elastic properties, and upon removal of the
<br />proof load, the assembly shall recover at
<br />least ~/z the maximum deflection; and
<br />iii. When subjected to the racking test,
<br />the standard 8 ft. x 8 ft. panel shall be
<br />loaded in increments of 4001bs. to a proof
<br />load of 4000 lbs., without evidence of
<br />failure. For three or more standard panel
<br />specimens, the average deflection shall not
<br />exceed the limits tabulated herewith:
<br />LOADING DEFLECTIONS
<br /> Total Residual
<br />800 lbs. 0.20 in. 0,08 in.
<br />1200 lbs. 0.28 in. 0.12 in.
<br />2400 Ibs. 0.80 in. 0.36 in.
<br />2. When the magnitude of the .proof load
<br />has not been determined or it is the intent
<br />that the tests establish allowable working
<br />loads, the loading increments shall be ap-
<br />proximately equal and such that data are
<br />recorded at five or more increments. The
<br />proof load for each type of test shall be de-
<br />termined from the load-deformation graphs
<br />as the load corresponding to that point on the
<br />curve at which the slope has increased not
<br />more than 100% over the average slope of
<br />the curve between the first and second in-
<br />crements of loading, provided that the as-
<br />sembly, subjected tothe so-determined. proof
<br />load, shall meet the criteria for acceptance
<br />set forth in paragraph (1) of this subsection.
<br />
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<br />83
<br />Fire Protection
<br />§ 1585.03
<br />not less than 2501b. per square. The maxi-
<br />mum exposure to the weather shall be 7
<br />inches for the 16" length, 6r/z inches for the
<br />15" length, and 5 inches for the 12" length.
<br />(d) Dutch method. The minimum weight
<br />shall be 2651b. per square. When applied the
<br />minimum head lap shall be 3 inches and
<br />minimum side lap shall be 4 inches.
<br />(e) French or hexagonal method. The
<br />minnnum weight shall be 2501b. per square.
<br />There shall be overlaps on at least two edges
<br />for a distance of not less than 3 inches,
<br />1583.05 Tile roofing.
<br />(a) Quality. All roofing the shall be well-
<br />burned clay roofing tile.
<br />(b) Underlay. The roof sheathing shall
<br />be covered with an underlay of 30 lb.
<br />asphalt-saturated felt.
<br />(c) Flat tile; size and exposure. Flat
<br />shingle the shall be not less than 7/16 inches
<br />thick and not more than 9 inches wide, with
<br />a maximum exposure to the weather of one-
<br />half the length of the the minus one inch.
<br />(d) Interlocking and curved tiles. Inter-
<br />locking the and curved tiles shall be laid in
<br />a manner approved by the Building Official.
<br />1583.06 Slate roofing.
<br />(a) Quality and exposure. Slate shingles
<br />shall be free from knots or knurls and not
<br />less than 3/16 inch thick. The maximum ex-
<br />posure to the weather shall be one-half the
<br />length of the slate minus lr/z inches.
<br />(b) Underlay. Before laying slate, the
<br />roof sheathing shall be covered with an
<br />underlay of asphalt-saturated felt weighing
<br />not less than 30 lb. per square.
<br />1583.07 Built-up roofing.
<br />(a) Quality o f materials, Materials used
<br />in the construction of built-up roofing shall
<br />comply with the requirements of the Under-
<br />writers' Laboratories, Inc., ASTM D226,
<br />D227, D250 or D 655.
<br />(b) Plies or layers, The covering shall
<br />include at least three layers applied in a
<br />manner approved by the Building Official.
<br />Each ply of felt shall have a minimum weight
<br />of 131b. per square.
<br />(c) Stone or gravel surf ace. Unless other-
<br />wise provided in this Dwelling House Code
<br />or approved by the Building Official, built-
<br />up roofs shall be surfaced with roofing
<br />gravel, or crushed stone at the rate of 400
<br />lb. per square for slopes not more than 1 in
<br />12 and the rate of application shall be de-
<br />creased proportionately to 2751b. per square
<br />for slopes of 3 in 12. If crushed slag is used,
<br />it shall be applied at the rate of approxi-
<br />mately 300 lb. per square for all slopes.
<br />(d) Asphalt-granule cap sheet. The top
<br />ply of felt and crushed stone or slag surfaces
<br />may be replaced with one layer of mineral
<br />surfaced asphalt cap sheet weighing not
<br />less than 851b, per square, and meeting the
<br />requirements of ASTM D371.
<br />1583.08 ®ther types of roof coverings.
<br />Other roof coverings, such as metal or
<br />canvas deck, may be used when the type and
<br />weight of material and method of applica-
<br />tion are approved by the Building Official,
<br />TITLE TFIIRTEEN-PR®TECTI®N REQUIREMENTS
<br />CHAPTER 85. FIRE PROTECTION.
<br />1585.01 Firestopping-general.
<br />Every building shall have all concealed
<br />draft openings in walls, partitions, and floors
<br />firestopped in such a manner as to provide
<br />an effective fire and smoke barrier between
<br />stories and.between the upper story and the
<br />roof space.
<br />1585.02 Materials for firestopping,
<br />The materials used in firestopping shall be
<br />noncombustible, except that wood firestops
<br />may be used in wood-framed floors, walls,
<br />or partitions.._Wood firestop shall be at.least
<br />2 inches in nominal thickness or, where solid
<br />members cannot be used, shall consist of
<br />not less than two thicknesses of 1-inch lum-
<br />ber with lapped joints. Materials other than
<br />wood used for firestopping shall not harbor
<br />vermin or rodents, shall completely and
<br />permanently fill across the openings to be
<br />firestopped.
<br />1585.03 Firestopping in exterior walls.
<br />Exterior walls shall be firestopped at each
<br />floor level and at the level where the roof
<br />rafters connect with the wall plate. At ma-
<br />sonry walls that are furred or studded off,
<br />the space created by the furring or- studding
<br />shall be firestopped at least once in each
<br />story.
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