Rough Opening and Framing Requirements

Step 1: Rough Opening and Framing Requirements

This section gives requirements for framing and rough opening clearances. Masonry or concrete openings must be lined with a treated wood product (wood buck). You must fasten the buck to the masonry opening in a fashion that will withstand conditions which would be encountered under the certified and advertised DP ratings for this window. The structural integrity of this installation is only as good as the bond between the wood buck and the masonry opening. For more details, contact your Marvin representative.

NOTE: Wood buck material thickness may vary. Illustrations show a 1/2″ plywood and 2 x 4 buck. Installations using material less than 2″ nominal material must use the jamb screw method of attachment and use 3/16″ concrete anchors.

Treated 2 x 4 buck

Construction adhesive

Masonry anchor

1/2″ treated plywood

(a)

(b)	(c)

Adhesive flashing

Figure 1: Preparing openings for concrete block openings.

1.On concrete block, masonry, or similar situations, line the sides, head jamb, and sill with treated lumber. Attach the lumber to the masonry opening with construction adhesive and masonry anchors which should penetrate the masonry opening by at least 1″--1 1/2″ (25--38). See figure1a and 1b.

2.For standard wood frame construction, prepare the opening following local codes, ASTM E2112--1, or fol- low the steps in the “Continuous Air Barrier Sys- tems” section.

3.If rigid panning is used, place a bead of silicone or construction adhesive over any fasteners used to hold the panning to the sill.

NOTE: If your installation requires screwing through the sill for structural purposes, place a bead of sealant where the screws will penetrate the rigid sill panning.

4.The window frame must not come in contact with treated lumber. If you will not be using rigid panning or shimming at the sill, apply a barrier such as a self sealing adhesive flashing to the rough opening sill. See figure 1 c.

Window specifications

Marvin Windows is a renowned name in the window and door manufacturing industry, known for its commitment to quality, innovation, and energy efficiency. Established in 1912, Marvin has built a legacy of craftsmanship and performance that meets the diverse needs of homeowners, builders, and architects alike.

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