edges.
2.1.3.2
Type X (Special Fire-Resistant)
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, tapered
edges.
2.1.4
Glass Mat Water-Resistant Gypsum Tile Backing Board
ASTM C 1178/C 1178M
2.1.4.1
Regular
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, square
edges.
2.1.4.2
Type X (Special Fire-Resistant)
1200 mm 48 inches wide, [12.7] [15.9] mm [1/2] [5/8] inch thick, square
edges.
[2.1.5
Glass Mat Covered or Reinforced Gypsum Sheathing
**************************************************************************
NOTE: This section should be used where exterior
gypsum sheathing with water resistance is required
(i.e. cavity sheathing over metal studs with brick
veneer or as substrate for EIFS systems). Always
use asphalt impregnated felt paper for sheathing
protection. For additional protection or if
recommended by the manufacturer, choose the
paragraph for sheathing sealant.
**************************************************************************
Exceeds physical properties of ASTM C 79/C 79M and ASTM C 1177/C 1177M.
Provide [12.7] [15.9,] mm [1/2][5/8] inch, gypsum sheathing. Gypsum board
shall consist of a noncombustible water-resistant core, with a glass mat
surfaces embedded to the gypsum core or reinforcing embedded throughout the
gypsum core. Gypsum sheathing board shall be warranted for at least 6
months against delamination due to direct weather exposure. Provide
continuous, asphalt impregnated, building felt to cover exterior face of
sheathing. [All joints, seams and penetrations shall be sealed with
compatible sealant.]
[2.1.5.1
Glass Mat Covered or Reinforced Gypsum Sheathing Sealant
Sealant shall be compatible with gypsum sheathing, rubber washers for
masonry veneer anchors,and other associated cavity wall components such as
anchors and through wall flashing. Sealants for gypsum sheathing board edge
seams and veneer anchor penetrations shall be the type recommended by the
gypsum sheathing manufacturer and have the following performance
requirements:
a.
ASTM D 412: Tensile Strength - 551 kilopascals 80 psi
b.
ASTM D 412: Ultimate Tensile Strength (maximum elongation) - 1172
kilopascals 170 psi
c.
ASTM D 624: Tear Strength, dieB, - 4.7 kN/m 27 ppi
d.
ASTM D 1149: Joint Movement Capability after 14 Days cure -
percent + 50
SECTION 09250
Page 10
Previous Page
