A.Â
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.Â
Types of weather wall coverings. The following materials shall be
accepted as approved weather coverings of nominal minimum thickness
specified:[1]
(1)Â
Brick masonry veneers: four inches.
(2)Â
Stone veneers: two inches.
(3)Â
Clay tile veneers: 3/8 inch.
(4)Â
Stucco or exterior plaster: 3/4 inch.
(5)Â
Wood siding - bevel: 1/2 inch at the butt.
(6)Â
Wood siding - board: one inch.
(7)Â
Precast stone facing: 5/8 inch.
(8)Â
Protected combustible siding: requires approval.
(9)Â
Wood shingles and shakes: 3/8 inch at the butt.
(10)Â
Exterior plywood: 3/8 inch.
(11)Â
Formed metal siding: 28 gauge.
(12)Â
Fiberglass shingles: 5/32 inch.
C.Â
Aluminum siding. Aluminum siding shall be allowed, subject to the
following conditions:
(1)Â
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)Â
All siding or material being covered by such aluminum siding shall
be in sound condition.
(3)Â
Horizontal aluminum siding shall not exceed nine inches in width.
(4)Â
All aluminum siding not backed shall be coated on both sides.
D.Â
Nailing weather boarding, wall and roof covering.
(1)Â
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)Â
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.Â
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
|
1Â 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.Â
Roofs, slope and covering.
(1)Â
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)Â
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)Â
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)Â
Self-sealing or interlocking singles may be used when the slope
of the roof is a minimum of 2Â 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)Â
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 2Â 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
|
5Â 1/2
|
7Â 1/2
|
(4)Â
Asphalt shingles.
(a)Â
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)Â
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.
(6)Â
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)Â
Flat roof coverings. Built-up roof covering for flat roofs, having
a pitch of not more than 2Â 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)Â
All other types of roof covering and manner of application shall
be approved by the Building Inspector.
(9)Â
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.Â
Lathing.
(1)Â
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)Â
Gypsum lath.
(a)Â
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)Â
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)Â
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)Â
Metal and wire lath.
(a)Â
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 2Â 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)Â
Wire lath shall be not lighter than Number 19 W. & M. gauge
wire, 2Â 1/2 meshes per inch coated with zinc and rust-inhibitive
paint.
(c)Â
Stiffened wire lath shall not be lighter than Number 20 W. &
M. gauge wire, 2Â 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)Â
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 2Â 1/2 inches or Number 16 W. & M. gauge zinc-coated
wire with not more than two-inch-by-two-inch mesh.
(6)Â
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.Â
Plastering.
(1)Â
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)Â
Thickness.
(a)Â
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)Â
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)Â
Application to masonry or concrete base. When masonry walls are plastered,
they shall be stripped, lathed and plastered to protect against moisture.
(4)Â
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.Â
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.Â
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.Â
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.