be installed in addition to support for all studs. This brace will be placed 305 to 457 mm
(12 to 18 ") from the bottom of the top channel track.
(5) Parapets. When parapet walls extend above the roof line a slip clip
connection will be used to allow for structural deflections without loading the steel stud
c. Sheathing. Fire and eater resistant gypsum board sheathing encased in water-
repellent paper on both sides and on the long edges will meet the requirements of ASTM C 79.
Other materials may be used as sheathing when supported by satisfactory performance data. All
gaps in the sheathing resulting from cuts, corners, joints and machine end cuts of the sheathing
and all joints at the interface of the sheathing with dissimilar materials such as floor slabs, doors,
windows, and other locations where the water-resistant membrane terminates will be taped or
filled with an exterior rubber-based caulk. The base detail of the exterior sheathing will be
designed to resist water infiltration and the caulking will be applied to form joints that are
complete and continuous. Enough connections of the sheathing to the steel studs to provide
lateral support for the studs in the direction parallel to the plane of the wall will be required. All
screw attachments through the exterior sheathing must resist air and water infiltration.
d. Veneer Anchors. Veneer anchors will be attached through the sheathing to the steel
studs. All steel components of anchors will be stainless steel or hot-dipped galvanized steel.
Anchor wires will be a minimum of 4.8 mm (3/16 ") diameter. There will be one anchor for each
0.19 m (2 ft ) of wall area and anchors will be spaced no further apart than 610 mm (24 "). The
load-deflection stiffness criteria of each veneer anchor, applies to direct loads in both tension and
compression, and will be not less than 350 N/mm (2000 lbs/in). The design load of the anchor
will be the controlling wind load on the stud tributary width times one-half the vertical span of the
stud. The controlling wind load will be the lesser of the design wind load or the wind load that
causes masonry cracking. This load will then be used to calculate the required anchor capacity.
Anchors will have a maximum "play" or not more than 1.59 mm (1/16 "). Synthetic rubber
washers will be used under tie connector plates. A clutch torque slip screw gun will be used to
eliminate stripping of threads. Additional anchors will be installed within 305 mm (12 ") of the free
edges of veneer panels and at the edges of wall openings at the normal spacing. Additional
anchors required around openings will be detailed on the contract drawings.
e. Fasteners. Screw connectors for stainless steel anchors will be stainless steel.
Screws for galvanized anchors will be hot-dipped galvanized.
f. Moisture Barrier. A water-resistant membrane will be placed over the exterior
sheathing. The membrane will be 67 N (15 lbs) roofing felt or similar material, such as: "Tyvek"
building wrap by Dupont or "Barricade" building wrap by Simplex. The barrier material will be
shingled with each sheet lapping over the sheet below with a minimum 152 mm (6") lap. Sheets
will be lapped a minimum of 152 mm (6") at vertical joints. The moisture barrier must not be a
vapor barrier that will trap water in the stud space of the wall.
g. Vapor Retarder. A 0.15 mm (6-mil) vapor retarder as required in the ROUGH
CARPENTRY guide specification will be provided on the warm side of the insulation. In most
geographical areas the vapor retarder will be located between the interior wall board material and
the face of the steel studs. In hot humid areas of the United States including the Gulf coast,
Florida, coastal Georgia, North Carolina, South Carolina and Virginia, the vapor retarder should
be located between the exterior sheathing and the steel studs. Check local practice and the
recommendations for the installation of insulation and vapor retarders at the project location. The
building designers should perform a condensation analysis of the wall system used to determine
the dew point location within the wall were condensation might be expected occur.
h. Flashing. Copper or stainless steel through-wall flashing as required in the SHEET
METALWORK, General guide specification will be used. Flashing must be designed, detailed