GIBRALTAR 13191 Galvanized 2.5-Gauge Steel Dimpled Lath Instruction Manual

: June 4, 2024
: Gibraltar

Table of Contents

13191

13191 Galvanized 2.5-Gauge Steel Dimpled Lath
Instruction Manual

INSTALLATION GUIDELINES
**METAL LATH

13191

**

Lath Installation

Begin at the bottom right-hand corner of the wall. Leave the paper backing overhanging at the top and left of the sheet. Offset paper backing has the paper overlapping 1-1/2 inches on one end and one side and retracted on the opposite end and side. The sheets should always be installed horizontally, perpendicular to the framing.
Laps: Minimum of 1 inch at edges with ends nested paper to paper, metal to metal. Apply the second sheet to the left of the first sheet lapping paper over paper and lath over lath. Place the third sheet centered above the first two sheets. This process is similar to that of laying bricks. This staggers the vertical butt joint seams and allows a more uniform dispersal of stress.
Nailing Methods: On horizontal applications, all nails shall be driven flush with the base.

Lath Fasteners: (per ASTM C-1063)

Concrete/Concrete Block: use a 3/8 inch diameter shank, 3/4 inch minimum length. Use 4 powder-actuated fasteners in the corners and 2 in the middle of long edges.
Wood Framing: use 11 gauge, 1-1/2 inch nails with 7/16 inch heads (roofing nails 4d 1-1/2 in. x 1/4 in. head)
Sheathing on wood framing: use 14 gauge 3/4 inch crown staples with a minimum 1-1/2 inch leg
Metal Framing: use self-drilling, self-tapping #12 x 3/4 inch wafer head screws. Use of powder-actuated fasteners is acceptable, but may cause spalling when shot to the substrate; follow the manufacturer’s instructions carefully.
Insulating Concrete Forms: Consult specific ICF manufacturer.

Fastener Spacing:

Wood Framing: Spacing of nails, staples or screws is not more than 7 inches on center along the framing member
Concrete/Concrete Block: 6 power actuated fasteners, 4 in corners, 1 on each side of the long edge in the center.

Cut and Trim to Fit Standard aviation shears or metal cutting scissors are used for notching and snipping. A circular saw equipped with a metal cutting blade easily zips through steel lath to cut to desired lengths.
Wire Tie ( 18-gauge) Lath is to be wire tied at 9 inches on center at edges, ends, and at laps between framing members. On plywood sheathing, lath may be nailed or stapled in lieu of tying at 9 inches on center at edges, ends, and laps between framing members.
Accessories Corner beads shall be used to protect all external corners with the plumb and true edges. Casing beads shall be used to terminate stucco or stone around doors, windows, or other openings. Flashing shall be used where lath and stucco are to be applied on walls. The intersection of the roof plane (i.e.: bulkheads, sidewalls, headwalls), a stucco stop, and flashing/counter flashing shall be carried over the flashing to terminate the stucco and/or stone. Zinc alloy or vinyl accessories are recommended for exterior applications.
Important Installation Note: Lath accessories are designed to make plaster jobs easier, and more efficient, and provide the final product a more professional look. To ensure this, accessories should be attached every 18 inches with nails, staples, or tie wires. For control joint, corner, and casing beads, the nose can be used as a screed for the stucco brown coat but must be embedded by 1/8 inch thickness of plaster on the final coat.
Jointing for Cracking Control: It is difficult to anticipate or prevent plaster cracks, but they can be largely controlled by means of expansion joints. The expansion joints should be installed between the lath. The lath is to be broken underneath the expansion joint to function properly. Fasten the joints to the lath. Walls and ceilings that use metal lath for the plaster base should be divided into rectangular panels with control joints at least every 18 feet or at the juncture of a dissimilar wall, or in either direction in a length-to-width ratio of 2½ to 1, or in ceilings exceeding 100 square feet or walls exceeding 144 square feet in area.

These installation guidelines are, based on ASTM C 1063-08 Standard Specification for Installation of Metal Lath.
Always consult your area building official before beginning any project to familiarize yourself with any local code requirements. This guide should not replace the designs and judgments of a qualified engineer and/or architect.

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