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November 24, 2021

10 Window Installation Tips

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The process of replacing or installing a brand-new window is somewhat complex. This guide focuses not on the step-by-step process, but instead on advice for performing correct installation. First-timers DIY installing windows for the home should incorporate these tips into their installation process.

Know the Parts by Their Proper Names

No matter how prepared you are, there's always a chance that you'll run into some issues when installing windows on your own. That's why it's important to know the exact names for all the parts and tools you'll need. You'll be able to ask for help, do extra research or buy replacement parts using the correct vocabulary.

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Measure the Middle

Don't just measure the height, width and length dimensions of the perimeter of the rough window opening. Instead. take measurements around the perimeter and in the middle, then compare. If there are any differences in your dimensions, which means you need to do some fill-in work with stud stock so you can even out the opening.

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Check for Water Damage

Be sure to do a thorough check in the areas around the window, both inside and out, to make sure there's no water damage from the previous window. If you discover water damage, you'll need to be able to seal up the opening where the window was until you can get the damaged parts replaced.

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Be Prepared to Replace or Supplement Insulation

Insulation may not be on your shopping list for your window replacement project, but you might want to add it. Depending on the scope of your installation, you may end up exposing some insulation in the walls. Water-damaged insulation should be removed and replaced, and if there doesn't appear to be enough around the windows, you can supplement it.

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Think About Water Incursions With Each Step

Windows are an easy point of entry for rainwater and other moisture, which can cause serious damage to your home. Be deliberate as you install the window, taking care to fold house wrap correctly. If you aren't working with house wrap, avoid applying flashing and flashing tape in such a way as to direct water down toward the window.

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Consider the Window's Location When Weatherproofing

The previous tips describe protecting your window from the elements, but these steps may not be necessary in all cases. If you're working with a window that's set underneath a roof overhang, certain window awning designs or otherwise protected from weather, for example, you may not want to spend the extra time and money to weatherproof.

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Rough Opening Versus Window Size

Make sure the window you buy isn't the exact same size as the rough opening. Otherwise, it may not fit. The rough opening should be about 1/4 to 3/8 inch larger than the window. You'll fill in any gaps using caulk or other sealants after installing.

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Test Fit Before Sealing

Before you run caulk or other sealant around the perimeter of the rough opening, do a dry fit run with the window first. Even if you've measured carefully multiple times, it's still best to make sure everything fits properly before you try to do the final installation. Use temporary nails to hold it in place.

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Level Is Part of Fit

While your window is held in place with temporary nails, use a spirit level on the bottom sill to make sure the window is level and square. Asymmetrical windows will look sloppy, so be sure not to skip this step.

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Consider Calling a Professional

As you can see, there are a number of potential issues you can run into while installing a window, including some that can have long-term implications for your home's value. If you've got the budget, consider hiring a contractor to oversee the work. You may be able to find a contractor who's willing to walk through the steps with you so you can gain hands-on experience with proper guidance and save the DIY for next time.

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