This document details the installation procedures for Marvin windows, specifically focusing on new wood frame construction and structural installation requirements. The instructions cover preparation of the rough opening, window unit preparation, positioning and securing the window, and crucial sealing and flashing techniques. Different product lines, including Wood Ultimate Casement, Double Hung, and Clad Casemaster series, are addressed, with specific notes for Impact Zone 2 and 3 rated windows. Proper installation is critical to achieving advertised design pressure ratings and maintaining warranty validity.
Preparing the Rough Opening
Proper preparation of the rough opening (RO) is fundamental to a successful window installation. The documentation outlines procedures for both building paper and sill panning applications. For building paper methods, an “apron” of Grade D building paper, 24 inches longer than the window width, is centered and stapled along the top edge. A bead of sealant is then applied approximately 6 inches up from the sill, followed by the installation of sill panning according to the manufacturer’s instructions.
Further preparation involves cutting a 13-inch piece of Grade D building paper, 24 inches longer than the RO height, and tacking it in place, overlapping the RO by the jamb depth. A utility knife is used to trim the paper flush with the head jamb and sill, and the jamb flaps are folded inward and tacked. Finally, a ¼ to ⅜ inch bead of sealant is applied along both sides of the window opening, stopping ¾ inch from the end, and not across the RO bottom.
Technical specifications indicate the rough opening should be ¼ to 1 inch wider and ¼ to ½ inch higher than the window frame’s outside measurement. For masonry openings, the width should be ¼ to ½ inch wider, and the height ¼ inch higher.
Window Unit Preparation and Positioning
Before installation, the window unit must be inspected for any hidden damage, and any issues reported immediately, referencing the customer service number etched on the glass. Protective packaging should be removed and recycled appropriately. Installation brackets or structural masonry clips, if required, should be fastened to the window unit at this stage, following the instructions provided with those components.
For units with flat casing, installation must utilize installation brackets, masonry clips, or screw-through jamb methods. Ultimate Casement Round Top units require a #10 x 3" screw through the top hole of each hinge directly into a framing member, once the unit has been installed and secured. Impact-rated Ultimate Casement Round Top units specifically require either installation brackets or the screw method.
Positioning the window in the opening requires careful attention to leveling, plumbing, and squaring. Once positioned, the unit is temporarily secured, and shims are installed to ensure it is square within the opening. The documentation emphasizes seeking assistance for large or heavy windows to avoid injury.
Fastening and Securing the Window
After the window is squared, it must be fully secured with nails or screws. Specific instructions are provided for space mull assemblies, which require anchoring with #8 sheet metal screws or structural masonry brackets within 4 inches of each side of the mull, with a minimum of 1 ¼ inch penetration into the framing material.
For units with flat casing, the documentation reiterates the necessity of using installation brackets, masonry clips, or screw-through jamb methods. Detailed structural fastening instructions are available online at www.marvin.com or by contacting a Marvin representative. Ultimate Casement Round Top Impact units must be installed using either installation brackets or the screw method.
Sealing and Flashing
Effective sealing and flashing are critical for preventing water intrusion and maintaining the integrity of the installation. Sealant should be applied to the back side of the casing at the joint where it meets the window, as well as between the casing ends and the sill horn, and at the mitered corners at the top of the casing. The sealant should be tooled to ensure a proper seal between parts.
The documentation stresses the importance of properly flashing and sealing all windows at the exterior perimeter, using sealants that are Grade NS Class 25 per ASTM C920 and compatible with the building exterior, window exterior surface, and flashing/water management materials.
Product-Specific Considerations
The instructions apply to a range of Marvin window products, including:
- Wood Ultimate Casement Family
- Wood Round Top
- Wood Tilt-Turn/Inswing Casement/Hopper
- Wood Polygon
- Wood Ultimate Double Hung Family
- Wood Glider
- Clad Ultimate Double Hung Magnum
- Clad Casemaster
- Clad Ultimate Double Hung (CUDH)
- Clad Direct Glaze Polygon/Round Top
Certified IZ2 and IZ3 Casemaster, Ultimate Double Hung, and Direct Glaze Polygon/Round Top units must be installed using jamb screws or structural brackets. Certified IZ3 Ultimate Double Hung Magnum units must be installed using the jamb screw method only. Installation methods for Impact Zone 4 windows are not covered in these instructions; users should refer to the Notice of Acceptance for specific guidance.
Aftermarket Products and Warranty Implications
The documentation cautions against alterations to Marvin products, including the use of window films, insulating window treatments, or additional glazings, as these can cause excessive heat buildup or condensation, potentially leading to premature failures not covered under warranty. Before applying any aftermarket product, it is recommended to contact the manufacturer for written product use information, associated warranties, and damage coverage, and to provide this information to the end user or building owner.
Technical Specifications Summary
Key technical specifications include:
- Rough Opening Width: ¼” – 1” wider than the window frame.
- Rough Opening Height: ¼” – ½” higher than the window frame.
- Masonry Opening Width: ¼” – ½” wider than the window frame.
- Masonry Opening Height: ⅛” – ¼” higher than the window frame.
- Sealants: Must be Grade NS Class 25 per ASTM C920.
- Weather Resistant Barriers: DuPont™ Tyvek® HomeWrap or Grade D building paper.
Conclusion
Successful Marvin window installation requires meticulous attention to detail, from rough opening preparation to final sealing and fastening. Adherence to the procedures outlined in these instructions, and specifically those pertaining to the window product type and impact zone rating, is crucial for achieving the advertised design pressure rating and maintaining the validity of the Marvin warranty. Proper flashing and sealing are paramount to preventing water intrusion and ensuring long-term performance.