A new window can light up a room almost as much as a fresh coat of paint, plus it will save you hundreds of dollars on your bills. So, if you're still undecided about replacing your old window with a new one because you don't know where to start, here's the solution. The following instructions explain how to change a window easily and effectively.
Steps
Part 1 of 3: Measure the Size of the Window to Replace
Step 1. Measure the height
To measure the height of the currently mounted window, start from the sill to the bottom of the top jamb.
For an accurate measurement, take measurements in three places: left, center, and right of the window. Then take the smaller size (measurements may not vary). Use this as a reading
Step 2. Measure the width
To measure the width of the currently mounted window, start from the left jamb to the right. Again, measure top, middle, bottom, and then take the smaller size for good.
Step 3. Finally, check the squareness by measuring both diagonals of the window
Take a tape measure and measure from the top left corner of the frame to the bottom right corner, and from the top right corner to the bottom left corner.
If there is a difference of less than 1/4 inch (0.635 cm) between the two diagonals, you can put some small shims when you go to install the new window. If the difference between the two measurements is greater, you should consider replacing the entire window frame
Step 4. Know that if you buy a window that fits the existing frame, you don't have to buy a new frame as well
This is why the old window is measured before removing it.
Part 2 of 3: Remove the Old Window
Step 1. Remove the retainers on the sides of the window
If you can, remove them without damaging them, as you will have to put them back once the new window is installed.
If they get damaged, take some putty and shape it on the damaged part of the fastener. Once dry, sand it to match the surrounding wood. You should give it a coat of paint before putting it back on the frame
Step 2. Remove the internal sliding sash from the window frame
After removing the fasteners, this should be simple. However, if the sliding door is connected to a weight with a chain, cut the chain or rope and let the weight fall into its seat.
Step 3. Slide the outer sash down to the bottom of the frame
Remove the separator nut and throw it away. Then remove the outer door the same way you removed the inner one, cutting any ropes or chains connected to the weights.
Do not remove the outer fasteners from the window frame. These latches will help guide and position the new window
Step 4. Clean up the frame
To prepare the frame for the new window, do the following before installation:
- Remove any weights from their locations. Lift the pulleys to the frame or remove them completely.
- Screw in each protruding screw and tap each nail. You can cover them by putting putty with a spatula, waiting for it to dry and then sand and paint it, making it invisible.
- If necessary, remove the old sealant with a putty knife or utility knife. Make sure there are no traces of sealant on the opening, or anything else that could get in the way of the new window.
Step 5. Check carefully that there is no damage to the window frame
If you notice any rot or water damage, you should call a professional for a quote on replacing the window frame and any surrounding structures. It's probably best to avoid trying without a professional's help.
Part 3 of 3: Install the New Window
Step 1. Apply a line of silicone along the inside of the latches, on the jambs
Step 2. Vertically center both internal and external sliding sashes in the window frame
Find the door blocks and start sliding them in the middle of the frame. Slide them in until four mounting holes are visible on the side jambs.
Step 3. Put an expander, also called a header, on top of the window, sealing it (optional)
Some prefer not to use it because it reduces the space available for the window and makes it more difficult to replace the seals. Use it at your discretion.
Step 4. Put the window into the frame, adding shim if needed
Check if the window is perfectly perpendicular (using a level, of course).
Step 5. Insert mounting screws into each jamb
There should be four screws, top and bottom on each side of the jamb. Insert them gently so as not to deform the coating.
Step 6. Enlarge the expander until the gap between the window and the frame is well sealed
Step 7. Check that the windows are working properly and there are no gaps
If you notice cracks or the movement of the window is not perfect, look for the adjusting screws in the side jambs. Use them to fix the window frame.
Step 8. Seal the inside of the window and refit the internal latches
Your project is officially finished.
Advice
- The window measurements determine the size of the spirit level to use. Use one that is roughly the same size as the window.
- Place the shims on the pre-drilled holes, so that when you screw the screws into place they will hold the shims in place.
Warnings
- Always get help when you take out the old window and put in the new one.
- Wear protective eyewear and gloves when working with power tools and when removing and replacing the window.
