Page 288 - 2018_IRC

WALL CONSTRUCTION

cate masonry units; or ASTM C1634 for concrete facing ASTM C616 for sandstone building stone; or ASTM C629
brick. for slate building stone.
R606.2.2 Clay or shale masonry units. Clay or shale R606.2.5 Architectural cast stone. Architectural cast
masonry units shall conform to the following standards: stone shall conform to ASTM C1364.
ASTM C34 for structural clay load-bearing wall tile; R606.2.6 Adhered manufactured stone masonry veneer
ASTM C56 for structural clay nonload-bearing wall tile; units. Adhered manufactured stone masonry veneer units
ASTM C62 for building brick (solid masonry units made shall conform to ASTM C1670.
from clay or shale); ASTM C126 for ceramic-glazed struc-
tural clay facing tile, facing brick and solid masonry units; R606.2.7 Second-hand units. Second-hand masonry units
ASTM C212 for structural clay facing tile; ASTM C216 shall not be reused unless they conform to the require-
for facing brick (solid masonry units made from clay or ments of new units. The units shall be of whole, sound
shale); ASTM C652 for hollow brick (hollow masonry materials and free from cracks and other defects that will
units made from clay or shale); ASTM C1088 for solid interfere with proper laying or use. Old mortar shall be
units of thin veneer brick; or ASTM C1405 for glazed cleaned from the unit before reuse.
brick (single-fired solid brick units). R606.2.8 Mortar. Except for mortars listed in Sections
Exception: Structural clay tile for nonstructural use in R606.2.9, R606.2.10 and R606.2.11, mortar for use in
fireproofing of structural members and in wall furring masonry construction shall meet the proportion specifica-
shall not be required to meet the compressive strength tions of Table R606.2.8 or the property specifications of
specifications. The fire-resistance rating shall be deter- ASTM C270. The type of mortar shall be in accordance
mined in accordance with ASTM E119 or UL 263 and with Sections R606.2.8.1, R606.2.8.2 and R606.2.8.3.
shall comply with the requirements of Section R302. R606.2.8.1 Foundation walls. Mortar for masonry
R606.2.3 AAC masonry. AAC masonry units shall con- foundation walls constructed as set forth in Tables
form to ASTM C1691 and ASTM C1693 for the strength R404.1.1(1) through R404.1.1(4) shall be Type M or S
class specified. mortar.
R606.2.4 Stone masonry units. Stone masonry units shall R606.2.8.2 Masonry in Seismic Design Categories A,
conform to the following standards: ASTM C503 for mar- B and C. Mortar for masonry serving as the lateral
ble building stone (exterior); ASTM C568 for limestone force-resisting system in Seismic Design Categories A,
building stone; ASTM C615 for granite building stone; B and C shall be Type M, S or N mortar.

TABLE R606.2.8
MORTAR PROPORTIONS a, b
PROPORTIONS BY VOLUME (cementitious materials)
Mortar cement Masonry cement Aggregate ratio
c
Portland cement or Hydrated lime or
MORTAR TYPE (measured in damp,
blended cement M S N M S N lime putty loose conditions)
M 1 — — — — — — 1 / 4
1
S 1 — — — — — — over / to /
1
Cement-lime 4 2
N 1 — — — — — — over / to 1 / 4
1
1
2
O 1 — — — — — — over 1 / to 2 /
1
1
4 2
M 1 — — 1 — — —
M — 1 — — — — — Not less than 2 / and
1
S 1 / — — 1 — — — 4
Mortar cement 2 — not more than 3 times
S — — 1 — — — —
N — — — 1 — — — the sum of separate
volumes of lime, if
O — — — 1 — — —
used, and cement
M 1 — — — — — 1
M — — — — 1 — —
S 1 / — — — — — 1
Masonry cement 2 —
S — — — — — 1 —
N — — — — — — 1
O — — — — — — 1
3
For SI: 1 cubic foot = 0.0283 m , 1 pound = 0.454 kg.
a. For the purpose of these specifications, the weight of 1 cubic foot of the respective materials shall be considered to be as follows:
Portland cement 94 pounds Masonry cement Weight printed on bag
Mortar cement Weight printed on bag Hydrated lime 40 pounds
Lime putty (Quicklime) 80 pounds Sand, damp and loose 80 pounds of dry sand
b. Two air-entraining materials shall not be combined in mortar.
c. Hydrated lime conforming to the requirements of ASTM C207.
2018 INTERNATIONAL RESIDENTIAL CODE ® 263
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