Sealing around windows and doors is one of the most common uses for expanding foam. But the high-expansion stuff can actually push the jamb inward, making them impossible to open. Avoid this by using minimal expanding foam. It's formulated to fill the space around windows and doors without excess expansion.
Many contractors use fiberglass. There is spray foam that gives the highest R value; this is one of the best insulation you can use around a replacement window. Fiberglass usually ends up not giving much insulation because it is put in to thick, or it is put in to thin and either way does not give proper air flow.
When measuring for a window replacement the new window should be just slightly smaller than the opening. Then a frame sealant/silicon would be used to seal and eliminate the drafts. Never use expanding foam as this does distort the frame.
Cut a length of sheathing tape to secure the vapor barrier to the wall above the window, overlapping the perimeter of the window. Seal the rest of the barrier around the window's perimeter. Pull back the vapor barrier at the floor and draw a bead of caulk along the wall near the floor.
The best insulation for stopping drafts around windows will be a material that keeps air from leaking around the frame. The most commonly used insulation materials are fiberglass and window spray foam insulation.
Foam-filled frames are designed to minimize thermal transfer that happens through the window frame by minimizing convection in the hollow part of the frame. Foam-filled frames can provide additional insulation and strength to the window.
Invert the can and insert it into the gap around the window or door and framework. Activate can by pulling the trigger. Wipe away imperfections with a cloth soaked in Great Stuff™ Foam Cleaner. Foam should be tack-free in 10 to 15 minutes.
Expanding polyurethane foam sealant requires moisture to expand and cure. If you're applying foam to dry wood or other dry surfaces, or working on a day with little humidity, misting the area first will help the foam expand and cure faster.
Low-expansion foam expands up to 30 times its liquid size, while high-expansion foam can expand as much as 300 times its liquid size, quickly putting pressure on a window frame to the point where it's difficult to open and close the window.
This expanding foam is definitely weatherproof. I used it outside and within an hour it was raining. The foam kept its shape and stayed firm.
Cold bridging happens when a warm surface or structure meets a colder one. Put simply it's a weak spot in the insulation surrounding a house, known as the thermal envelope. Cold bridges (also known as thermal bridges) occur whenever there is a break in the continuity of the insulation.
Sealing around windows and doors is one of the most common uses for expanding foam. But the high-expansion stuff can actually push the jamb inward, making them impossible to open. Avoid this by using minimal expanding foam. It's formulated to fill the space around windows and doors without excess expansion.
Bubble wrap is often used to insulate greenhouse windows in the winter, but it also seems to work fine for windows in the house. You can use it with or without regular or insulating window shades. It also works for windows of irregular shape, which can be difficult to find insulating shades for.