Now that you have the types of basement windows you want, you need to install them. This is where a majority of people feel more comfortable calling in a professional. With a little know how, this is not as enormous a task as it may appear. Removing the window was the first step, so consider yourself halfway there already.
You should measure the window opening to make sure the basement windows you purchased will fit. Even if you already measured to removing the old window, the measurement may change slightly once the old window is removed. Once you know that the window will fit, try and make the opening smooth and clean. Make sure there’s no dirt or debris present and file down any sharp protrusions. This is important to make sure there are no problems with the replacement basement windows at a later date.
Now you need to install a piece of molding, on the inside of the basement window. If you purchased a pre-fabricated window kit, then there will likely be molding included. If you don’t have a pre-made molding you will need to make one from wood or metal. This is a fairly easy task and just requires framing the window opening. Again, be sure to measure carefully so that the molding fits snugly.
Next you need to work from the outside of the window and slide the replacement basement windows into place. It’s very helpful to have someone inside to help hold the window securely and make sure there are no mishaps. If there’s a slight gap between the molding and the frame, there is no need to worry. Ideally there should be about a half-inch gap on all sides of the window.
Once you have checked for a proper fit, remove the basement window. Prepare the caulking and apply it to the window frame according to the manufacturer’s directions. Usually you will just be applying it to the exterior flange, but occasionally to the inside jambs as well. When you have done this you can replace the window.
Have the person helping you push the window and hold it tightly in place. Be sure that the replacement basement window is level from the inside. You can adjust this by placing shims in the opening around the window to level it out a bit if needed. Also be sure that the space between the molding and the window is the same on all sides.
The final step is securing the basement windows. Some windows will require that you screw or nail the exterior flange, others just requires screws on the side. Do whichever step your window requires now. Don’t over tighten the screws or it may cause the jamb to warp and it will leak in the future. It is also a good idea to add some extra caulking to the exterior of the window to prevent leakage there. If all these steps have been completely properly, you should have correctly working replacement basement windows