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1571.04
<br />DWELLING HOUSE CODE
<br />72
<br />exterior wall openings which could other-
<br />wise be filled with windows, either isolated
<br />or in continuous bands. Glass block con-
<br />struction shall not be deemed as an integral
<br />part of a wall nor shall it bear any load
<br />other than its own weight. Glass block shall
<br />have a minimum overall thickness at the
<br />mortar joints of at least 3~/z inches unless
<br />otherwise approved by the Building Official.
<br />All mortar surfaces shall have satisfactory
<br />treatment for mortar bonding properties.
<br />1571.04 Maximum size of glass block panels.
<br />No isolated panel or portion of a continu-
<br />ous band of glass block construction in ex-
<br />terior walls shall exceed 20 feet in height
<br />nor 25 feet in length without intermediate
<br />support and adequate expansion joints. No
<br />such panel or portion of a continuous band
<br />shall exceed 144 square feet in area.
<br />L571.05 Installation of glass block in ex-
<br />terior walls.
<br />(a) Supports and joints. Glass block
<br />panels shall be supported to resist wind
<br />pressure and protected from forces caused
<br />by expansion or contraction by expansion
<br />joints which shall be entirely free of mortar.
<br />Glass blocks in exterior walls shall be laid
<br />up in mortar composed of one part portland
<br />cement, l part lime and 4 parts finely graded
<br />sand, or other materials approved by the
<br />Building Official. All mortar joints shall be
<br />completely filled, and then pointed after the
<br />mortar has passed its initial set. Joints shall
<br />have' a thickness of at least 3/16 inch and
<br />not more than 3/a inch,
<br />(b) Reinforcement of glass block panels.
<br />1. Horizontal mortar joints, in glass block
<br />panels in exterior walls, shall be reinforced
<br />with ties which shall run continuously from
<br />end to end of mortar joint, but shall hot
<br />bridge expansion joints. Where splices oc-
<br />cur, the individual lengths shall be lapped
<br />not less than 6 inches.
<br />2. Ties shall be formed of two parallel
<br />steel wires No. 9 gage or larger, spaced 2
<br />inches apart by steel cross wires No. 14 gage
<br />or larger, welded thereto at intervals not ex-
<br />ceeding 8 inches, and galvanized after form-
<br />ing, or of other equivalent construction. Ties
<br />shall be located in horizontal joints as fol-
<br />lows:
<br />Blocks 53/4 in. high in wall, every fourth
<br />course.
<br />Blocks 73/4 in. high in wall, every third
<br />course.
<br />Blocks 113/4 in. high in wall, every second
<br />course.
<br />(c} Edges of glass block panels. Chases
<br />or slots shall be provided at the head and
<br />jambs of glass block panels. Such chases or
<br />slots shall be not less than 1~/z" deep and
<br />shall be filled with at least r/i' of resilient
<br />material. The sill shall be coated with an
<br />asphalt emulsion previous to laying the first
<br />bed of mortar. The space between the glass
<br />block and the sides of the chases or slots
<br />shall be tightly packed with oakum or other
<br />similar material and pointed with nonhard-
<br />ening calking material at least 1/z inch deep.
<br />1571.06 Class block panels in wood frame
<br />exterior walls.
<br />The installation of glass block panels in
<br />wood frame construction shall be permitted
<br />only upon specific approval by the Building
<br />Official of previously submitted details of
<br />the proposed installation.
<br />CIiAPTER 73. INTERIOR WALLS AND PARTITIONS.
<br />1573.01 Wood framing for bearing parti-
<br />tions.
<br />The construction of interior bearing wall
<br />and bearing partitions of conventional wood
<br />framing shall be similar in quality to the
<br />requirements for the framing of exterior
<br />walls as set forth in Chapter 67, Wood bear-
<br />ing partitions shall not be used in cellars,
<br />basements, crawl spaces or air spaces. In-
<br />terior bearing partitions shall have a type
<br />of framing similar to that of the exterior
<br />walls, with respect to the.length of studs and
<br />thickness of bearing plates, partition caps, or
<br />girts.
<br />1573.02 Studs in wood nonbearing parti-
<br />tions.
<br />Studs in non-bearing partitions shall be
<br />continuous lengths without splicing. In non-
<br />bearing wood partitions, exceeding 6 feet of
<br />unsupported length and containing openings,
<br />the studs shall be not less than 2 x 4's (4-inch
<br />thickness) with spacing as determined by
<br />type of interior finish.
<br />For partitions. less than 6 feet in unsup-
<br />ported length, with openings:
<br />Maximum
<br />Minimum Size Spacing
<br />2 x 4's (2-inch thickness) 16 inches o,c.
<br />2 x 3's (3-inch thickness) 16 inches o.c.
<br />2 x 4's (4-inch thickness) 24 inches o.c.
<br />For partitions 6 feet or over in length
<br />without openings;
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<br />53
<br />Wood
<br />1545.20 Framing of openings.
<br />All window and door openings shall have
<br />double studs for the full height of the open-
<br />ing at jambs, with lintels as provided in Sec-
<br />tion 1545.07, or by an approved truss con-
<br />struction bearing on the inner studs at each
<br />jamb, or by other approved methods or con-
<br />necting devices to support the superimposed
<br />loads.
<br />1545.21 Types of sheathing.
<br />Except when back-plastered stucco con-
<br />struction is used, or the stucco is furnished
<br />with a wrapping of No, 18 U. S. gage wire
<br />attached horizontally on the studs at 6-inch
<br />intervals, the sheathing of all exterior frame
<br />walls shall consist of one of the following
<br />materials of the designated minimum thick-
<br />ness or any other material of equal strength
<br />and durability approved by the Building Of-
<br />ficial: 1-inch reinforced cement mortar; 5/s-
<br />inch (actual) wood sheathing; i/z-inch gyp-
<br />sum boards; r/z-inch fiber boards; 5/16-inch
<br />plywood.
<br />1545.22 Sheathing behind masonry veneer.
<br />In dwellings with brick or other masonry
<br />veneers, the sheathing may consist of a layer
<br />of paper-back wire fabric of not less than No.
<br />16 U. S. gage galvanized wire with stiffening
<br />ribs not more than 5 inches on center, to
<br />which is attached a double layer of fibrous
<br />waterproof backing. The veneer shall be laid
<br />up with 1-inch air space between veneer and
<br />sheathing.
<br />154523 Plywood construction.
<br />(a) Material. All plywood shall be iden-
<br />tified as to veneer-grade and glue-type by
<br />the manufacturer's identification marks. Ply-
<br />wood exposed to weather or to severe condi-
<br />tions of service shall meet the requirements
<br />established for Exterior Type in Commercial
<br />Standards CS 45, or for Type I in Commer-
<br />cial Standard CS 35. Plywood for interior
<br />use above ground and not subject to severe
<br />conditions of service shall meet the require-
<br />ments established for Interior-Type in Com-
<br />mercial Standard CS 45, or for Type II or
<br />III in Commercial Standard CS 35.
<br />(b) Allowable Stresses, A 11 o w a b l e
<br />stresses for plywood other than Douglas fir
<br />plywood shall be established in the manner
<br />set forth by FPL Report R1630. Allowable
<br />stresses for Douglas fir plywood shall con-
<br />form to CS 45.
<br />(c) Nailing. Plywood sheathing on roofs
<br />or side-walls and plywood sub-flooring shall
<br />have nailing equivalent to at least 6d com-
<br />mon nails spaced not more than 6 inches on
<br />§ 1545.24
<br />edge bearings and 12 inches on other bear-
<br />ings. .
<br />1545.24 Integrated assemblies.
<br />(a) Conditions of use. Panels or other in-
<br />tegrated assemblies, fabricated of dimension
<br />lumber with wood stress-coverings glued
<br />thereto or consisting of structure units of
<br />metal-covered or molded plywood, or other
<br />approved plastics, formed and molded into
<br />prefabricated load-bearing members, shall be
<br />permitted for use in floors, roofs, walls, par-
<br />titions, and ceilings when designed in ac-
<br />cordance with accepted engineering practice
<br />or meeting the tests and other requirements
<br />of Sections 1555,04 and 1555.05,
<br />(b) Structural Character. All structural
<br />assemblies, wholly or partly of plywood,
<br />shall be assembled and connected so as to
<br />provide awell-integrated structure and,
<br />where exposed to the weather, shall provide
<br />tight weatherproof joints, The fastenings of
<br />stress panel coverings to longitudinal or
<br />transverse structural studs or.ribs shall pro-
<br />vide rigidity equivalent to approved gluing.
<br />(c) Surfaces Exposed to Weather, Where
<br />used for exterior facing of exterior walls or
<br />where subject to exposure, plywood glued to
<br />framing members shall be glued with Type
<br />A Glue, which shall be equal to glues con-
<br />forming to one of the fallowing specifica-
<br />tions:
<br />1. Joint Army-Navy Specification, JAN-A-
<br />397.
<br />2. Military Specification, MIL-A-5534.
<br />(d) Interior Surfaces. Where used for in-
<br />terior walls or ceilings subject to normal con-
<br />ditions of service, plywood glued to framing
<br />members shall be glued with Type A' or
<br />Type B Glue. Type B Glue shall be equal to
<br />glues conforming to one of the following
<br />specifications:
<br />1. Federal Specifications, C-G-456.
<br />2. Federal Specifications, C-G-496.
<br />(e) Floor Assemblies. Either Type A or
<br />Type B Glue may be used for floor assem-
<br />blies where ventilation is provided.
<br />(f) Stressed Skin Construction, Stressed
<br />skin plywood construction shall be designed
<br />in accordance with principles outlined by
<br />FPL Report R1220. All stressed skin ply-
<br />wood construction shall conform to the fol-
<br />lowing requirements:
<br />i. The plywood laminations shall be well
<br />glued together.
<br />ii. The plywood coverings. shall be se-
<br />curely glued to the frames.
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