A. 
General requirements. All exterior wall coverings shall be of approved moisture- and weather-resisting materials of sufficient stiffness and properly attached to resist rain and wind. All exterior intersections between wood or metal and masonry veneer shall be caulked with elastic waterproofed material, except where metal-flashed. The bottom edge of the exterior siding immediately over any exterior wall opening shall be so located as to permit the headflashing to extend under the siding and to be turned up behind the siding.
B. 
Types of weather wall coverings. The following materials shall be accepted as approved weather coverings of nominal minimum thickness specified:[1]
(1) 
Brick masonry veneers: four inches.
(2) 
Stone veneers: two inches.
(3) 
Clay tile veneers: 3/8 inch.
(4) 
Stucco or exterior plaster: 3/4 inch.
(5) 
Wood siding - bevel: 1/2 inch at the butt.
(6) 
Wood siding - board: one inch.
(7) 
Precast stone facing: 5/8 inch.
(8) 
Protected combustible siding: requires approval.
(9) 
Wood shingles and shakes: 3/8 inch at the butt.
(10) 
Exterior plywood: 3/8 inch.
(11) 
Formed metal siding: 28 gauge.
(12) 
Fiberglass shingles: 5/32 inch.
[1]
Editor's Note: Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. II).
C. 
Aluminum siding. Aluminum siding shall be allowed, subject to the following conditions:
(1) 
Such siding shall have a minimum thickness of 0.025 inch; provided, however, where insulation board is used as backing, the minimum thickness shall be 0.020 inch. Furthermore, the minimum thickness shall be 0.002 inch less to allow for rolling tolerance.
(2) 
All siding or material being covered by such aluminum siding shall be in sound condition.
(3) 
Horizontal aluminum siding shall not exceed nine inches in width.
(4) 
All aluminum siding not backed shall be coated on both sides.
D. 
Nailing weather boarding, wall and roof covering.
(1) 
All weather boarding and wall and roof covering shall be securely nailed with aluminum, copper, zinc, zinc coated or other approved corrosion-resistive nails into the supporting structure in accordance with the recommended nailing schedule or the approved manufacturer's standards. Shingles and other weather covering attached directly to the sheathing less than one inch thick shall be secured with barbed or other mechanically bonding nails of approved type or other common nails on furring strips attached to studs.
(2) 
Combination wall sheathing/siding. In direct-to-stud applications, panels 5/16 inch and 3/8 inch nominal thickness or more may be used over studs spaced 16 inches o.c. with face grain applied parallel to studs. Panel five-sixteenths-inch thick shall meet special cross-band requirements, such as those given in American Plywood Association Manufacturing Specification for Specialty Siding.
E. 
Exterior stucco. All stucco work shall be reinforced with approved metal lath or wire fabric as herein specified; except when applied to a masonry base. The reinforcing fabric shall be coated with zinc or other approved rust-resistive coating or shall be manufactured from corrosion-resistive alloys.
Type of Reinforcement
Minimum U.S. Gauge
Maximum Mesh
Minimum Weight
(pounds per square yard)
Metal lath
—
—
1.80
Expanded metal
—
—
3.40
Woven wire
18
1 inch
1.74
Woven wire
17
1 1/2 inches
1.41
Woven wire
16
2 inches
1.47
Welded wire
18
4 square inches
0.67
Welded wire
17
4 square inches
0.82
Welded wire
16
4 square inches
1.10
F. 
Roofs, slope and covering.
(1) 
Roofing. All roofs shall be covered with wood, asphalt, tile or slate shingles; or with a built-up asphalt; or tar coated with gravel or capped with a mineral surface cap sheet; or with sheet metal, fiberglass shingles or approved materials. All roofing shall be placed and nailed in approved manner. Plain tar paper roll roofing shall not be permitted.[2]
[2]
Editor's Note: Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. II).
(2) 
Slope; rise. The slope of all roofs of buildings and structures when tile, asphalt, fiberglass or slate shingles are used shall not be less than four inches rise to 12 inches run, except as provided below:
(a) 
Where built-up roofing with gravel slag or mineral cap sheet is used, the maximum rise shall be three inches to 12 inches run.
(b) 
Self-sealing or interlocking singles may be used when the slope of the roof is a minimum of 2 1/2 inches rise to 12 inches run, providing a double layer of fifteen-pound asphalt saturated felt underlayment is hot-mopped on the roof overhang and extends up to a point at least 24 inches inside of the exterior building wall.
(3) 
Wood shingle roofing. If wood shingles are used, they shall be No. 1 grade, edge grain and shall be of such length, thickness and exposure as shown in Tables G and H. Wood shingles shall not be used on roofs having a slope of less than four inches rise per twelve-inch run.
Table G
Wood Shingle Roof Covering
Minimum Length
(inches)
Minimum Thickness
16
5 butts in 2 inches
18
5 butts in 2 1/2 inches
24
4 butts in 2 inches
Table H
Wood Shingle Roof Covering
Maximum Exposure for Shingle Length
(inches)
Slope of roof to 12-inch run
16
18
24
Rise 4 inches and over
5
5 1/2
7 1/2
(4) 
Asphalt shingles.
(a) 
Asphalt shingles shall be approved Class "C" label (Underwriters' Laboratories, Inc.) square butt strip shingles weighing not less than 235 pounds per square or hexagonal strip shingles weighing no less than 195 pounds per square, interlocking shingles weighing not less 180 pounds per square or individual shingles weighing no less than 250 pounds per square laid over asphalt felt or similar felt of not less than 15 pounds per 100 square feet.
(b) 
Starting row of all asphalt shingles shall be doubled. Such shingles shall be nailed with aluminum, copper or hot-dipped galvanized nails. Nail according to manufacturer's recommendations.
(5) 
Tile and slate shingles of durable quality shall be laid in an approved manner over asphalt felt or similar approved felt of not less than 30 pounds per 100 square feet.[3]
[3]
Editor's Note: Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. II).
(6) 
Fiberglass shingles. Fiberglass shingles with an approved Class "A" label (Underwriters' Laboratories, Inc.) butt strip shingle weighing not less than 225 pounds per square laid over felt or similar approved felt of not less than 15 pounds per 100 square feet and installed and nailed according to manufacturer's recommendations.
(7) 
Flat roof coverings. Built-up roof covering for flat roofs, having a pitch of not more than 2 1/2 inches rise to 12 inches run, shall be approved Class "B" (Underwriters' Laboratories, Inc.) minimum three-ply roofing consisting of three layers of asphalt or tar-saturated felt, each layer of not less than 15 pounds per 100 square feet. Where tar or asphalt coating is used, the roof shall be surfaced with pea gravel. All layers of felt shall be mopped solid.
(8) 
All other types of roof covering and manner of application shall be approved by the Building Inspector.
(9) 
Reroofing. A new roof covering may be applied on top of an existing roof covering. No more than two layers of roof covering will be allowed. If additional layers of roofing material are requested, calculations shall be submitted. A permit is required.
Every room used for sleeping, dining, cooking, toilet or bathing purposes shall have the walls and ceiling of approved materials or finished in an approved manner as regulated by this chapter. Approved materials shall include plaster, tile, wood, gypsum wallboard and masonry units. All wall and ceiling finishing materials shall have a minimum composite thickness of 1/2 inch, except that 1/4 inch plywood or hardboard paneling is acceptable. Materials less than 1/4 inch shall be backed by 3/8 inch backer board.
A. 
Lathing.
(1) 
General requirements. All lath shall be nailed in accordance with the nailing schedule, Table No. 4,[1] tied, laced, clipped or otherwise effectively secured. Internal angles, coves, arches and junctures between wood, fiber insulation, gypsum lath and other plaster bases shall be reinforced with cornerites of metal lath or other similar approved material, except where metal or wire lath is carried around such intersections. No interior lath shall be applied until all exterior framing of buildings or structures is covered.
[1]
Editor's Note: Table No. 4 is included as an attachment to this chapter.
(2) 
Gypsum lath.
(a) 
Gypsum lath shall be nailed to wood supports or attached to metal supports by means of clips in an approved manner. Such supports shall be spaced not to exceed 16 inches on center for three-eighths-inch gypsum lath and 24 inches on center for one-half-inch gypsum lath.
(b) 
Joints of gypsum lath abutting walls and ceiling shall be staggered. Gypsum lath shall be applied with the long dimension at right angles to supporting members, with joints broken in each course and shall not be abutted tightly together, nor be more than 1/4 inch apart.
(3) 
Fiber insulation lath. Fiber insulation lath, when used as a plaster base, shall have a rough, fibrous texture to insure mechanical and suction bond and shall be nailed in an approved manner to wood supports spaced not to exceed 16 inches on center. Such nails shall be placed not less than 3/8 inch from the ends and not less than 1/2 inch from shiplapped, tongued and grooved, or interlocking type lath. Shiplapped, tongued and grooved or interlocking edges shall be fitted to contact.
(4) 
Metal and wire lath.
(a) 
The dimensions, sizes and application of expanded, ribbed and sheet metal lath and all types of wire lath shall comply with accepted engineering practice. Expanded, ribbed and sheet metal lath shall provide a key sufficient to retain the plaster and shall weigh not less than 2 1/2 pounds per square yard. Such lath shall be fabricated from steel sheets, copper-bearing steel or other approved corrosion-resistive metals and shall be pierced to provide a mechanical key to retain the plaster by slitting, punching, expansion and shall be given a protective coating of rust-inhibitive paint after fabrication or shall be made from galvanized sheets.
(b) 
Wire lath shall be not lighter than Number 19 W. & M. gauge wire, 2 1/2 meshes per inch coated with zinc and rust-inhibitive paint.
(c) 
Stiffened wire lath shall not be lighter than Number 20 W. & M. gauge wire, 2 1/2 meshes per inch, with number 24 U.S. gauge V-rib stiffeners spaced not to exceed eight inches apart coated with zinc or rust-inhibitive paint.
(5) 
Paper-backed lath. Expanded metal or wire fabric lath backed with integral approved paper shall be fabricated from not lighter than Number 24 U.S. gauge zinc-coated metal sheets with maximum openings of 1 1/8 by 2 1/2 inches or Number 16 W. & M. gauge zinc-coated wire with not more than two-inch-by-two-inch mesh.
(6) 
Lathing accessories. All metal lathing accessories including corner beads, base screeds, picture molds, metal casing and similar accessories, shall be fabricated from not less than Number 26 U.S. gauge zinc-coated steel sheets and shall be provided with prefabricated or expanded deformations or otherwise formed to insure complete embedment and keying of the plaster.
B. 
Plastering.
(1) 
Number of coats. Plastering with gypsum hard-wall, lime or portland cement plaster shall be applied in not less than three coats when applied over metal or wire lath and in not less than two coats when applied over other plaster bases permitted in this code. Lime or portland cement plaster shall not be applied directly to fiber insulation lath or gypsum lath.
(2) 
Thickness.
(a) 
Grounds shall be installed to provide for the following thicknesses of interior plaster, from face of plaster base to finished plaster surfaces, as regulated in Table 1.
Table 1
Thickness of Plaster
(inches)
Type of Base
Residential
Metal or wire lath
5/8 minimum
Other approved types of lath
3/8 minimum
Unit masonry and concrete walls
1/2 minimum
Monolithic concrete ceiling
1/8 minimum; 3/8 maximum
(b) 
If monolithic concrete ceiling surfaces require more than 3/8 inch of plaster to produce desired lines or surfaces, metal or wire lath shall be attached thereto.
(3) 
Application to masonry or concrete base. When masonry walls are plastered, they shall be stripped, lathed and plastered to protect against moisture.
(4) 
Weather protection. When interior plastering work is in progress, adequate ventilation shall be provided, and in freezing weather, the enclosure shall be heated. Plaster shall not be applied to surfaces that contain frost.
C. 
Drywall. All drywall shall be a minimum of one-half-inch gypsum board applied and jointed per Gypsum Association Specifications Pamphlet GA-216-74.
The number of nails at each bearing and connecting wood member shall not be less than the number shown in Table No. 4.[1] A coated sinker may be used in lieu of a common nail.
A. 
Staples. Power-driven, divergent chisel point galvanized wire staples may be used for fastening plywood, fiberboard or gypsum wall sheathing, plywood or hardboard underlayment, plywood roof sheathing, plywood subflooring, gypsum lath, asphalt roof shingles and the first ply only of two-ply system gypsum drywall finish, provided that the gauge, crown, length and spacing of the staples for a particular material and condition of use are in compliance with accepted standards and as regulated herein, except that the gauge of staples used for fastening structural wall sheathing, roof sheathing and subflooring shall not be less than No. 14.
B. 
Power-driven, divergent chisel point galvanized wire staples or equivalent nails not less than two inches long may be used in lieu of nails for fastening wood boards one inch (nominal) in thickness to studs, joists or rafters, provided the gauge of such staples is not less than No. 14. The number of staples to be used at each stud, joist or rafter shall be determined on the basis of one staple for each required nail.
[1]
Editor's Note: Table No. 4 is included as an attachment to this chapter.