Prebuck® Window and Door Buck

Treated Laminated Strand Lumber (LSL) Framing

The window and door bucks are produced with a 1-1/2" (38 mm) thick, borate-treated Laminated Strand Lumber (LSL) offering an engineered solution for punched openings. The buck frame can be used in combination with any wall structure type and is ideally suited for wide-width walls such as insulated concrete forms. The buck features a double dovetail keyway and optional metal flanges to ensure the frame stays in place during and after concrete placement.

Download Data Sheet

Find a Rep or Distributor

Prebuck is manufactured from Laminated Strand Lumber (LSL) that is pressed and glued using MDI resin. This resin forms a plastic binder between the structural strands of lumber, providing an engineered framing solution designed to resist twisting, warping, and cupping.

Laminated Strand Lumber (LSL) is an engineered wood product. It is a structural composite formed by bonding thin parallel veneers together in large billets and cutting to dimension based on intended use.

Prebuck products come in standard lengths of 16' (4.88 m). Widths can be customized based on the design for the project. Prebuck also offers packages cut to length for window and door bucking.

To order Prebuck products for your project, click <a href="##">HERE</a> to contact your local Tremco rep or Nudura distributor. Or submit a Prebuck order inquiry using <a href="##">THIS FORM</a> or by calling 616.309.6256 during normal business hours, 8:30 am to 5:00 pm (ET).

Prebuck zinc borate treated option is approved to be used in accordance with AWPA Use Category UC2. This treatment allows Prebuck products to be used within the building envelope and in direct contact with masonry or concrete surfaces.

The zinc borate treatment used in Prebuck is non-corrosive; therefore, no specially coated fasteners are required.

Prebuck products treated with zinc borate must not be used in exposed exterior conditions or in direct ground contact applications.

Typical exposure during construction is expected. The product may discolor, and edge swelling is possible; however, the structural integrity is not compromised. Prebuck recommends care is taken to limit exposure to the elements and that coverings be applied within 6 months.

No, the zinc borate treatment is present throughout the cross-section of Prebuck and requires no further treatment to cut edges or other modifications made on-site.

Prebuck is made with MDI resin that produces a plastic coating over the structural strands of lumber. When exposed for periods of weathering and moisture the edges of the material may swell but are warranted against swelling more than 3/16” (4.76 mm). Length and width of the material will not change in dimension.

ASTM D1037: Density	38
ASTM D1037: Product Moisture Content	6 to 8%
ASTM E518: Thermal Properties	1.25
ASTM E84: Flame Spread	140
AWPA Category 2: Use in Direct Contact with Concrete	Pass
Specific Gravity - Edge	.42