You can easily trim the sill expander with a utility knife or hack saw. At this point you should install the replacement window from inside the house into the window opening.
This step is much easier with two people, one person can hold the window in place while the other person checks the fit and gaps around the opening. You may need to shim the window up somewhat in order to adjust the height of the sill expander.
Staple some fiberglass insulation to the old sill. This will help insulate the space between the old sloping sill and the new replacement window. Most replacement windows also come with an adjustable header to fill the top space. The adjustable header should also be filled with insulation. Run a heavy bead of caulking on the inside of the blind stops, be sure to do the sides and top.
When you install the replacement window it will come in contact with the caulking to create a weather tight seal. Set the bottom of the replacement window in the opening and tilt up the window until the window comes in contact with the caulking on the blind stops. Be sure to center the window and check it for level and plumb. Once the window is plumb and square you can install the factory supplied screws through the new replacement window jambs into the old wood jambs.
Most replacement windows come with pre-drilled holes to screw through. Be careful not to over-tighten the screws as you can damage the window and also cause it to operate poorly. Now you need to insulate between the new replacement window unit and the old window jambs.
Replacement windows are just too sensitive to movement, if the foam expands too much the window will not operate correctly. Instead, insulate the space with fiberglass insulation, with the help of a putty knife to push it into tight spaces. After you insulate with fiberglass you can seal the cracks with caulking for a better air seal. Now you can re-install the old interior stops if they still work, in our case we needed to make new ones because of the difference in window sizes or install new ones.
The interior stops also help hold the window in place. After the interior stops are installed you can re-install the old casing or add new casing. For our project we were able to save the old casing and re-install it. Also note that we never removed the window stool or apron for this project. Replacement windows almost never require you to remove the old stool or apron. Finally you should caulk all of the exterior edges of the new replacement window unit where it meets the existing window opening.
This helps create a better air seal and also helps keep out wind driven rain. As I said earlier installing replacement windows is a project that most DIY do-it-yourself folks can handle.
It takes between 1 hour and 2 hours to completely install a replacement window. Combine that with the huge Stimulus Tax Rebates For Windows and this is a project that will pay you back very quickly. I'm full time builder for a large construction company in New Hampshire. I run their design-build division that specializes in custom homes, commercial design-build projects and sub-divisions.
I'm also a licensed civil and structural engineer with extensive experience in civil and structural design and home construction. My hope is that I can share my experience in the home construction, home improvement and home renovation profession with other builders and home owners.
Please feel free to contact me if you have any questions, suggestions or you'd like to inquire about advertising on this site. All posts by Todd ». Search for more articles here. Enter keywords like, 'insulation' or 'kitchens' etc to find your topic. In order to install vinyl replacement windows without a helper I remove the upper and lower sash.
I then can pick up the frame with one hand and easily install it without assistance. Once the frame is trued, shimmed, caulked and stops reinstalled I insert the upper and lower sash.
New replacement windows are generally screwed into the window opening lumber framing with long screws. These are hidden when the sashes are installed. Use foam insulation in any large gaps. It expands, so don't over fill the gaps. Caulk all around the frame. Send your questions to Here's How, Royalgreen Dr.
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