Page 299 - 2018_IRC

WALL CONSTRUCTION

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R606.13 Multiple-wythe masonry. The facing and backing than one tie for each 2.67 square feet (0.248 m ) of wall
of multiple-wythe masonry walls shall be bonded in accor- area. Neither the vertical nor the horizontal spacing of
dance with Section R606.13.1, R606.13.2 or R606.13.3. In the adjustable wall ties shall exceed 24 inches (610 mm).
cavity walls, neither the facing nor the backing shall be less The maximum vertical offset of bed joints from one
than 3 inches (76 mm) nominal in thickness and the cavity wythe to the other shall be 1.25 inches (32 mm). The
shall be not more than 4 inches (102 mm) nominal in width. maximum clearance between connecting parts of the ties
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The backing shall not be less than the thickness of the facing. shall be / inch (2 mm). Where pintle legs are used, ties
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Exception: Cavities shall be permitted to exceed the 4- shall have not less than two / -inch-diameter (5 mm)
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inch (102 mm) nominal dimension provided that tie size legs.
and tie spacing have been established by calculation. R606.13.2.3 Bonding with prefabricated joint rein-
R606.13.1 Bonding with masonry headers. Bonding forcement. Where the facing and backing (adjacent
with solid or hollow masonry headers shall comply with wythes) of masonry are bonded with prefabricated joint
Sections R606.13.1.1 and R606.13.1.2. reinforcement, there shall be not less than one cross
wire serving as a tie for each 2.67 square feet (0.248
R606.13.1.1 Solid units. Where the facing and backing m ) of wall area. The vertical spacing of the joint rein-
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(adjacent wythes) of solid masonry construction are forcement shall not exceed 16 inches (406 mm). Cross
bonded by means of masonry headers, not less than 4 wires on prefabricated joint reinforcement shall not be
percent of the wall surface of each face shall be com- smaller than No. 9 gage. The longitudinal wires shall be
posed of headers extending not less than 3 inches (76 embedded in the mortar.
mm) into the backing. The distance between adjacent
full-length headers shall not exceed 24 inches (610 R606.13.3 Bonding with natural or cast stone. Bonding
mm) either vertically or horizontally. In walls in which with natural and cast stone shall conform to Sections
a single header does not extend through the wall, head- R606.13.3.1 and R606.13.3.2.
ers from the opposite sides shall overlap not less than 3 R606.13.3.1 Ashlar masonry. In ashlar masonry,
inches (76 mm), or headers from opposite sides shall be bonder units, uniformly distributed, shall be provided
covered with another header course overlapping the to the extent of not less than 10 percent of the wall area.
header below not less than 3 inches (76 mm). Such bonder units shall extend not less than 4 inches
(102 mm) into the backing wall.
R606.13.1.2 Hollow units. Where two or more hollow
units are used to make up the thickness of a wall, the R606.13.3.2 Rubble stone masonry. Rubble stone
stretcher courses shall be bonded at vertical intervals not masonry 24 inches (610 mm) or less in thickness shall
exceeding 34 inches (864 mm) by lapping not less than 3 have bonder units with a maximum spacing of 3 feet
inches (76 mm) over the unit below, or by lapping at ver- (914 mm) vertically and 3 feet (914 mm) horizontally,
tical intervals not exceeding 17 inches (432 mm) with and if the masonry is of greater thickness than 24
units that are not less than 50 percent thicker than the inches (610 mm), shall have one bonder unit for each 6
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units below. square feet (0.557 m ) of wall surface on both sides.
R606.13.2 Bonding with wall ties or joint reinforce- R606.14 Anchored and adhered masonry veneer.
ment. Bonding with wall ties or joint reinforcement shall R606.14.1 Anchored veneer. Anchored masonry veneer
comply with Section R606.13.2.3. installed over a backing of wood or cold-formed steel shall
R606.13.2.1 Bonding with wall ties. Bonding with wall meet the requirements of Section R703.8.
ties, except as required by Section R607, where the fac- R606.14.2 Adhered veneer. Adhered masonry veneer
ing and backing (adjacent wythes) of masonry walls are shall be installed in accordance with the requirements of
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bonded with / -inch-diameter (5 mm) wall ties embed- Section R703.12.
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ded in the horizontal mortar joints, there shall be not less
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than one metal tie for each 4 / square feet (0.418 m ) of
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wall area. Ties in alternate courses shall be staggered. SECTION R607
The maximum vertical distance between ties shall not GLASS UNIT MASONRY
exceed 24 inches (610 mm), and the maximum horizon- R607.1 General. Panels of glass unit masonry located in
tal distance shall not exceed 36 inches (914 mm). Rods load-bearing and nonload-bearing exterior and interior walls
or ties bent to rectangular shape shall be used with hol- shall be constructed in accordance with this section.
low masonry units laid with the cells vertical. In other
walls, the ends of ties shall be bent to 90-degree (0.79 R607.2 Materials. Hollow glass units shall be partially evac-
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rad) angles to provide hooks not less than 2 inches (51 uated and have a minimum average glass face thickness of / 16
mm) long. Additional bonding ties shall be provided at inch (5 mm). The surface of units in contact with mortar shall
all openings, spaced not more than 3 feet (914 mm) apart be treated with a polyvinyl butyral coating or latex-based
around the perimeter and within 12 inches (305 mm) of paint. The use of reclaimed units is prohibited.
the opening. R607.3 Units. Hollow or solid glass block units shall be stan-
R606.13.2.2 Bonding with adjustable wall ties. Where dard or thin units.
the facing and backing (adjacent wythes) of masonry are R607.3.1 Standard units. The specified thickness of stan-
bonded with adjustable wall ties, there shall be not less dard units shall be not less than 3 / inches (98 mm).
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274 2018 INTERNATIONAL RESIDENTIAL CODE ®
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