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WSWH Washer Head Interior Structural Wood Screw Application

Joining Multi-Ply Engineered Wood (EWP) Beams Application

The MiTek Pro Series WSWH Structural Wood Screws have been designed

specically for use in joining wood members of multiple-ply engineered

wood beams (LVL, LSL & PSL). Using a standard 1/2'' low speed/high

torque drill, install screws into the side of the outermost ply. As the

threads fully engage the nal ply, allow the underside of the washer

head to pull the plies rmly together. Washer head will install ush

with the surface of the wood, but do not overdrive as this may

damage the beam. Refer to the information below for proper

WSWH screw size selection and fastening pattern.

Minimum Spacing Requirements:

• Beams wider than 7" require special consideration by the design

professional. The values on the next page do not apply.

• Excessively warped or curved LVL should never be forced

into alignment by use of clamps, screws or bolts as splitting may

occur, potentially decreasing the carrying capacity of the beam.

• The WSWH338, WSWH5, and WSWH634 are not designed for

use with dimensional lumber. Refer to MiTek’s Joining Multi-Ply

Dimensional Lumber Beams Application information on page 28.

• A qualied designer or engineer should always be consulted

for critical assemblies and fastening requirements.

General Guidelines:

Top Loaded Beams

Where oor joists rest on all plies of the beam, WSWH screws should

be installed in two staggered rows at 24" O.C. spacing. Maintain the

minimum end and edge distance as indicated above.

For beam depths of 18" or more, this pattern should be increased

to three staggered rows of WSWH screws every 24" on center.

WSWH338 – 3-3/8"

WSWH5 – 5-1/2"

WSWH634 – 6-3/4"

Length

Designation

Fastener Identication

For easier selection and post installation inspection, all

MiTek Pro Series Wood Screws carry an identifying head marking.

Minimum end distance = 3-3/4"

Minimum edge distance = 1-3/4"

Minimum spacing between rows

of screws = 1-3/4"

Minimum spacing between

screws in a row = 3-1/2"

24"

18"

USP

Brand

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