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Level and Secure Window — Secure the New Window

Intermediate2 mins

Part of project

Window Replacement · Step 7 of 10

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In this video

Carefully lift and place the prepared window into the rough opening, resting its bottom frame on the previously placed shims. Once the window is roughly in place, use a long spirit level to check that the bottom sill of the window is perfectly level. Adjust the shims as necessary to achieve a level surface. After confirming the bottom is level, use an impact driver or power drill to fasten the bottom nailing flange to the framing with screws. Next, use the spirit level to check that the vertical sides of the window frame are plumb (perfectly vertical). Make any necessary adjustments using shims or by gently shifting the window. Once the sides are plumb, secure them by fastening the side nailing flanges to the framing with screws. It is recommended to use screws for fastening the window as they provide a more precise and secure installation compared to nails, and reduce the risk of damaging the window frame with a hammer.

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FAQs

Is replacing a window genuinely an 'intermediate' DIY project, and can it realistically be completed in two days?

Yes, it's considered intermediate due to the precision required for sealing, leveling, and potential structural work. The two-day estimate is realistic for a first-timer, accounting for thorough preparation, careful installation, flashing, sealing, and trim work. Unexpected issues like discovering wood rot or an out-of-square opening can extend the timeline.

What are the most critical safety precautions I should take when replacing an old window?

Always wear safety glasses and work gloves to protect against broken glass, debris, and sharp tools. If working on upper floors, ensure you use a stable ladder or scaffolding, and consider having a helper for heavy lifting. Be cautious of lead paint or asbestos in older homes; research proper mitigation or consult a professional if present.

Which tools on the list are absolutely essential for making this project go smoothly, especially for a beginner?

The SPEC OPS Molding Pry Bar and Nail Puller are crucial for efficient and less damaging removal of old trim and nails. A reciprocating saw (like the RIDGID Fuego) is invaluable for quickly cutting out stubborn window frames. Don't underestimate the importance of shims for accurate leveling and squaring, and a good utility knife for flashing tape.

What are the most common mistakes DIYers make during window replacement, and how can I avoid them?

A frequent mistake is failing to ensure the new window is perfectly level and square, leading to operational problems and drafts. Another common error is improper flashing and sealing, which can result in significant water leaks. To avoid these, double-check all measurements before ordering, and use a level and shims meticulously during installation, following manufacturer instructions for sealing.