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Step 5 · Shim and Level the Window

Once the window is roughly in place, begin inserting shims between the window frame and the rough opening. Start with the sill, then the jambs, and finally the head. Use the level to check for plumb and levelness as you insert shims. Ensure there is even pressure from the shims all around the frame. Once satisfied with the window's alignment, secure the shims by driving nails or screws through them and into the rough opening framing, being careful not to over-tighten and distort the frame.

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Step 5 · Shim and Level the Window

Once the window is roughly in place, begin inserting shims between the window frame and the rough opening. Start with the sill, then the jambs, and finally the head. Use the level to check for plumb and levelness as you insert shims. Ensure there is even pressure from the shims all around the frame. Once satisfied with the window's alignment, secure the shims by driving nails or screws through them and into the rough opening framing, being careful not to over-tighten and distort the frame.

Videos for this step

Shim and Level WindowPosition and Shim the New WindowTest Fit and Shim the New Window

Tools and Materials

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Window Installation

Step 5 of 8·2.3 hr left

Inspect and Prepare the Rough Opening
30 minutes6 items
Apply Flashing Tape to Sill
15 minutes3 items
Apply Flashing Tape to Jambs and Head
20 minutes3 items
Position and Set the Window
25 minutes4 items
5
Shim and Level the Window
40 minutes6 items
6
Fasten the Window Frame
30 minutes4 items
7
Install Remaining Flashing and Sealant
25 minutes5 items
8
Install Interior Trim and Finish
45 minutes8 items
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