3-Way Thru-Wall Flashing

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Use                           
A preformed metal flashing designed to provide life of the building
moisture protection in masonry structures. Use at floor levels, beneath
sills, over lintels, continuous at spandrel beams, beneath copings and
elsewhere as required.
                                                


Type
Three-Way Bond Interlocking Type with 3/16" high undercut sawtooth ribs at 3" intervals to provide a three-way mechanical
bond in the mortar bed and insure rapid drainage of moisture to the exterior. Interlocking feature provides for watertight joints
without the use of sealant or solder except at corners and special conditions. (See Figures 7 through 12.)         

Gauge/Sizes
Available in type 302/304 dead soft stainless steel, Terne Coated Stainless Steel, copper, lead, coated copper and aluminum.

For concealed applications such as floor levels, sills, lintels and spandrel beams use .015" or .018" stainless steel; 10 oz.
copper or .025" aluminum. Where exposed use .015" or .018" stainless steel; .015" or .018" Terne Coated Stainless Steel; 16
oz. copper or lead coated copper or .032" aluminum.

10 oz. copper supplied in widths to 36". Standard lengths of 49-1/2" allow for a 1-1/2" interlocking end lap. Other lengths to
88-1/2" available on request. 

Installation
Concealed flashings should start 1/2" back from the exterior face of the wall, extend through the wall, stepping up at least one
brick course to promote drainage and terminate with a 2" turn up at the interface. Where a turn up is impractical, the flashing
should terminate with a 1/4" hook dam approximately 1" back from the inside face of the wall.

Lintel and sill flashings should extend at least 4" beyond the jambs of the openings. Flashings at spandrel beams should be
continuous. At vertical limitations the flashing should be turned up a minimum of 2" and sealed with plastic roofing cement.

All flashings should be set with a thin bed of mortar below and above with care being taken to insure that the mortar completely
fills the bonding ribs.

Specifications
All thru-wall flashings shall be the three-way bond interlocking type as manufactured by Keystone Flashing Co., Philadelphia,
PA. Flashings shall be formed to provide a mechanical bond in the mortar bed in all three directions. Bonding features shall
consist of 3/16" high undercut sawtooth ribs spaced at not more than 3" intervals. Use (gauge/material) for fully concealed
flashings and (gauge/material) for flashings that are exposed. Set flashings with a thin bed of mortar below and above with end
joints overlapping not less than 1-1/2". Furnish and install where shown on the drawings and in strict accordance with the
manufacturer’s recommendations.


 

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Two Piece Cap Flashing Specifications

Cap flashings in walls where flat roofs abut shall be two piece type as manufactured by Keystone Flashing Co., Philadelphia,
PA. Receiver shall be formed of (gauge/material) with a special vertical locking slot that requires no malleting or bending to
hold the insert member in place. Combination receivers and thru-wall flashing shall have 3/16" high undercut sawtooth ribs at 3"
intervals to provide a mechanical bond in the mortar bed in all three directions. The insert members shall be formed of
(gauge/materials) and designed to snap lock into the receiver portion and provide a spring like hug against the base flashing.
Thru-wall receivers shall be set with a thin bed of mortar below and above. Install counter flashing insert members with end
joints lapped 3".

3-Way Thru-Wall Flashing Specifications

Cap flashings in walls where flat roofs abut shall be two piece type as manufactured by Keystone Flashing Co., Philadelphia,
PA. Receiver shall be formed of (gauge/material) with a special vertical locking slot that requires no malleting or bending to
hold the insert member in place. Combination receivers and thru-wall flashing shall have 3/16" high undercut sawtooth ribs at 3"
intervals to provide a mechanical bond in the mortar bed in all three directions. The insert members shall be formed of
(gauge/materials) and designed to snap lock into the receiver portion and provide a spring like hug against the base flashing.
Thru-wall receivers shall be set with a thin bed of mortar below and above. Install counter flashing insert members with end
joints lapped 3".

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Copyright © 1999 Keystone Flashing Company, Inc.