How to Install Window Jamb Liners

Lead Image
  • 2-10 hours
  • Intermediate
  • 50-500
What You'll Need
New liners
Putty knife

With the cost of energy continuously on the rise, it's important that your home is kept as energy efficient as possible. With that in mind, one of the main places in a home that loses energy is through old windows. Windows can wear down over time with repeated use, the effects of weather, and temperature fluctuations. Luckily, whether you're trying to improve your home's efficiency or just fixing a broken window, repairing the jamb liners in the window might be all that is needed to satisfy your objective.

Step 1 - Clear the Work Area

The first thing you'll need to do is make sure you have plenty of access to the window you're working on. Take down any curtains or blinds that may obstruct the work flow and make replacing the jamb liners more of a hassle than it should be. Depending on the type of blinds that are over the window, this may be time consuming but it's a necessary process to ensure you have plenty of space to work with.

Step 2 - Measure for the New Liners

Once the window is ready to be worked on, it's important to take some measurements of the window's dimensions. You can then use these measurements to make sure you pick out the appropriate sized jamb liner for your window. Additionally, if you are having trouble finding the right jamb liners for your windows, you can reference the old liners to find the right kind. The old liner should have a model number and manufacturer name written on it, which can both be used to track down the original model.

Step 3 - Remove the Sashes

Next, you will need to remove the actual windows themselves, called sashes, in order to gain access to the jamb liners. To do this, simply press inward on the jamb liner and pull the top of the bottom sash out of the liner channel. The sash should rotate out of the liner and towards you with ease. With sash in hand, you can pull the rest of the sash up and out of the liner altogether. Repeat the same process for the top sash. Be sure to remove the sashes with care as you will be reinstalling them once the new liners are in place.

Step 4 - Remove the Old Liner

With both sashes properly and carefully removed, it's time to pry loose that old liner. To do so, press in on the liner, scrunching it together, and pull up. The liner should come up and out of the window frame with a little force. Sometimes, you may need to take out any wooden stops that might prevent the liner from popping loose. Additionally, some liners are sealed with caulk, which makes them more difficult to remove. If this is the case, simply take you putty knife and draw it along the edge of the liner. This should cut through the sealer and free the liner for proper removal.

Step 5 - Install the New Liner

With both of the old jamb liners now out, it's time to install the new ones. The installation of the new jamb liners is similar to what you did when you removed the old ones -- just in reverse. Take the new jamb liners in hand and, pressing them together, place them inside the window frame where the old ones used to be. Make sure the tops of the jams are in proper alignment, or the sash won't be able to sit inside the liner correctly.

Step 6 - Install the Sash

After the new jamb liners have been successfully installed, place the top sash in first. Make sure the sash is in line with the liner and angle it in first before placing the entire sash inside the track. Repeat the process for the bottom sash.

Step 7 - Test the Window

Before you put back your blinds, you need to test the window to make sure everything is working like it should. To do this, slide the windows up and down, making certain they remain in the track of the jamb liner. Sometimes, especially with brand new jamb liners, the windows will be hard to move up and down. Don't worry -- this is common with new liners, and the windows will start to operate smoother over time as they get more use. Once everything is working properly, reinstall your blinds and move on to the next window.