Tools and Materials You'll Need

Before starting your double hung window replacement project, gather all necessary tools and materials to ensure a smooth process. Having everything ready will help prevent delays once you begin the removal of your old window.

Essential tools include: a pry bar, hammer, utility knife, tape measure, level, screwdriver (both flathead and Phillips), caulk gun, and safety equipment like gloves and eye protection. For materials, you'll need the new window unit, exterior-grade caulk, low-expansion foam insulation, shims, and exterior flashing tape. Depending on your specific situation, you might also need exterior trim or interior casing materials if the existing ones are damaged.

Measuring for Your New Window

Accurate measurements are crucial for a successful window replacement. Improper measurements can result in gaps, drafts, or a window that simply won't fit in the opening. Take time to measure carefully before ordering your replacement window.

Measure the width of the window opening at three points: top, middle, and bottom. Use the smallest measurement as your reference. Then measure the height at the left, center, and right sides, again using the smallest measurement. Finally, check the squareness of the opening by measuring both diagonals—they should be equal. When ordering your replacement window, subtract 1/4 inch from both the height and width measurements to allow for adjustments during installation. This small gap will be filled with insulation later in the process.

Removing the Old Window

Removing your old double hung window requires careful attention to avoid damaging the surrounding wall structure. Start by removing any window treatments, screens, and storm windows. For the main window unit, the process will depend on whether you're doing a full-frame replacement or a pocket installation.

For a full-frame replacement, use a utility knife to cut through the paint or caulk seal around the interior trim. Carefully pry off the interior trim with a pry bar, preserving it if possible for reinstallation. Remove any exposed nails or screws securing the window frame. From the exterior, cut through any sealant around the window frame and remove exterior trim as needed. The window can then be pushed from the outside or pulled from the inside.

For pocket installations (replacing just the sashes within the existing frame), the process is simpler. Remove the interior stop moldings that hold the lower sash in place. The lower sash can then be removed, followed by any parting strips and finally the upper sash. Clean the frame thoroughly and repair any rot or damage before proceeding.

Installing the New Double Hung Window

With the opening prepared, you're ready to install your new double hung window. This is typically a two-person job, as windows can be heavy and need precise positioning. Begin by applying a continuous bead of caulk to the exterior side of the blind stop (the part of the frame where the window will sit). This creates a weathertight seal.

Center the window in the opening from the outside, pressing it firmly into the caulk. Have a helper hold it in place while you check that it's level and plumb using your level tool. Insert shims at the corners and midpoints to maintain proper spacing and squareness. Once the window is perfectly positioned, secure it with screws through the pre-drilled holes in the frame.

Test the operation of both sashes to ensure they move smoothly and lock properly. Make any necessary adjustments to the shims before completing the installation. Apply low-expansion foam insulation to fill gaps between the window frame and rough opening, being careful not to overfill as this can cause the frame to bow.

Window Brand Comparisons and Options

When selecting a replacement double hung window, several major manufacturers offer quality products with different features and price points. Andersen Windows is known for their durable construction and excellent warranty coverage. Their 400 Series is particularly popular for double hung replacements, offering good energy efficiency and various wood interior options.

Pella provides innovative features like their hidden screen that rolls away when not in use, and their windows often include between-the-glass blinds options for easier cleaning. For budget-conscious homeowners, JELD-WEN offers reliable double hung windows at more accessible price points without sacrificing quality.

Vinyl windows from Milgard or Simonton provide excellent energy efficiency and require minimal maintenance. For historic homes, Marvin offers reproduction-style windows that maintain authentic appearances while incorporating modern energy-efficient technology. Consider factors like material (vinyl, wood, fiberglass, or composite), glass package (double or triple glazing), and energy ratings when comparing options.

Conclusion

Replacing a double hung window is a manageable DIY project that can significantly improve your home's comfort and energy efficiency. While the process requires careful measurement and attention to detail, following the steps outlined above will help ensure success. For complex installations or multiple windows, consider consulting with a professional window installer who can provide expertise and save you time. Remember that proper installation is just as important as the quality of the window itself—even the highest-rated window will underperform if not correctly installed. With the right tools, materials, and approach, your new double hung windows will provide years of reliable service and improved home comfort.

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This content was written by AI and reviewed by a human for quality and compliance.