Use this guide to install a sash kit or window insert without damaging the molding or exterior casing.
If you have the right tools and tips, installing a window yourself can be a weekend project.
Check out our steps below and get started today.
Credit: Helen Norman
If the opening is square, the two measurements will be the same, give or take 1/8 inch.
The slightest deviation from square can prevent the sash from closing and the weather stripping from sealing properly.
You’ll be stuck with drafts, condensation, andhigh utility billsif that happens.
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Scoring the seams prevents the wood from splitting when you remove the trim pieces.
Slide a flat pry bar behind the inside stops and remove the pieces.
Next, score head stop and gently pull it loose with pliers.
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Set aside for later use.
Use a flat pry bar and a scrap piece of wood to remove the casing.
If you’ll reuse the casing, use slip-joint pliers to remove the screws.
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Pull nails through the back of stop or trim pieces with pliers after removal to prevent splitting or fracturing.
Repeat with the upper sash.
Fold the jamb liner at a 90-degree angle underneath the sash.
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Repeat with the upper sash, folding the jamb liner across the top of the sash.
Remove Window
Remove the old sashes and jamb liner as a single unit.
You may need a helper for assistance with larger windows.
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With a helper standing outside to catch the window, start prying outward.
You may need to tap the jambs with a hammer.
Once the window is loose and ready to fall, go outside to help with removing the old window.
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Use proper lifting techniques to avoid back injuries.
Lift with your legs, not your back.
Insert New Jamb Liner
Install a liner bracket every 4 to 5 inches along each jamb.
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see to it each bracket is level before you nail it on.
Attach the jamb liners to the liner brackets.
Each liner should pop into place.
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Install Sashes
Insert the upper sash in the exterior track of the jamb liner.
Open and exit the sash to see to it it slides smoothly.
Insert the lower sash in the interior track and check that it operates.
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Install Head and Side Stops
Reattach the head stop.
Set the nails below the wood surface.
Fill the holes with wood putty and touch up with paint.
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Reattach the inside stops.
Set the nails and fill the holes with wood putty.
Caulk the seams and touch up with paint.
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Use a flat pry bar and a scrap piece of wood to remove the casing.
If you’ll reuse the casing, use slip-joint pliers to remove the screws.
Pull down the upper sash and do the same.
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Remove the sash weights.
Remove Stool and Apron
Inside the house, pry out the stool (inside sill).
It may be easiest to cut through the nails first (see next step).
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Also, remove the apron, which is attached to the wall directly below the stool.
Cut Through Nails
Cut through the nails that attach the jamb to the house’s framing.
A reciprocating saw works best for this, but you’re free to also use a hacksaw.
Remove one or both sashes.
Pull Out the Window
With a helper standing outside to catch the window, start prying outward.
You may need to tap the jambs with a hammer.
Once the window is loose and ready to fall, go outside to help pull it out.
Molding that rests on top of the siding is the easiest to remove.
