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How To Install A Residential Window

Drafty residential windows can increase your energy bill and make your house less comfortable.

Here’s How To Install Residential Windows Installing residential windows might sound intimidating but it doesn’t have to be. You have two choices when it comes to window replacements — full replacement or insert window replacementwhich is more for a frame that’s in good shape. You can go with an insert window which is also known as a pocket window but when the existing windows are old and failing, a full replacement down to the house framing is best. To get the right size window, measure the height of the pocket opening, which is the frame of the actual window and not the stops. The new window must be 1/2 to 3/4 inches smaller than the actual opening. Check the manufacturer’s directions for specifics. When you’ve bought your new window, you can remove the old sashes. All windows are built differently, so the steps needed to remove your windows will likely vary. It’s best to remove the sashes from the inside, but sometimes, it will be easier to work from the outside. If you have a storm window, remove it first then, you might have to score the paint before taking out the screws. Remove the sashes if you can and pry out the frame. Most residential windows have side sash springs. Carefully remove those from the outside.


Remove the exterior sash stops using an oscillating saw or a hammer and chisel. Take out the upper sash then remove them middle parting stops and removes the lower sash. You can leave the interior stop. Make sure any holes are filled or that there is good existing wood where the new window will be screwed into the frame. Replace any damaged or rotten wood and then clean the opening to remove all of the dust and debris. The area needs to be clean and free of anything that could get in the way of replacement. Once the sashes have been removed, the frame is ready for our replacement window. Apply flashing tape to the sill, it should fit the entire length of the sill itself. Extend the tape up the vertical leg of the stool and work the tape into the corner. Then, check the ledge with a level for bowing. If needed, you can place and level the sill shims to correct any bowing. It’s important to place the shims correctly to ensure proper leveling. Attach the shims with flashing tape to prevent any further movement. Flashing tape will also ensure that leveling is maintained. Once they are level, dry fit the window into the opening, it would be best if you had a little gap around the frame. Then, set the new window aside. Apply a 3/8 inch bead of sealant at the interior head, jamb stops, and sill. Place the window in the opening resting it against the internal stops and making contact with the sealant. Install shims at the pre-drilled holes in the frame then drive screws through the holes and the shims. Add shims at the ends of the meeting rails, as needed, to be sure that the sashes sit evenly within the frame. Check for plumb level and squareness to be sure that the window operates properly. You can make any additional adjustments with shims when everything is right. Apply spray foam insulation recommended for Windows:


Refer to the specific manufacturer instructions to fit the sill adapter. Measure the height from the window to the sill then carefully cut the adapter with a sharp utility knife. Drill two weep holes at the bottom and lock it on the window. Install the exterior trim around the window frame and seal the edges but don’t cover the weep holes. You can paint the molding later on, if you want. Next, apply caulk along the interior trim line.

If you need professional help replacing your residential windows, Fast Glass has been replacing windows for more than 40 years. We are here to help! Call us for a free residential window replacement quote.

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How To Install A Residential Window.  

Here’s How To Install Residential Windows Installing residential windows might sound intimidating but it doesn’t have to be. You have two...

How To Install A Residential Window.  

Here’s How To Install Residential Windows Installing residential windows might sound intimidating but it doesn’t have to be. You have two...

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