Each frame has weatherstripping around the perimeter and that weatherstripping should seal the existing window.
How to insulate around windows and doors.
This keeps the cold air out with a pocket of air between the window and the plastic.
A more commonly recommended approach is to seal the film in one of these kits to the window door frame rather than to the door itself.
With the insulation on the inside of the 2 bys right moisture from inside air can condense on cool 2 bys if the insulation isn t sealed properly possibly leading to rot.
Apply rigid foam insulation and foil.
Weatherstrips are an inexpensive way to help seal drafty doors and windows.
Avoid this by using minimal expanding foam.
It s formulated to fill the space around windows and doors without excess expansion.
When you purchase a window panel kit you should get all the necessary components and specific installation instructions.
You can buy a kit from your home improvement center to do this with or order one from the internet however make sure the foam is for around windows.
Use high expansion spray foam around windows and doors.
But the high expansion stuff can actually push the jamb inward making them impossible to open.
Sealing around windows and doors is one of the most common uses for expanding foam.
This guide from lowes can help you knock out.
It s a great insulator and perhaps the best cost effective way to insulate your windows.
Then fill in the gaps in insulation with foam which will seal around the window.
Placing the insulation on the outside of the 2 bys left keeps the header warm and puts the thermal break on the outside.
I m affixing it to the door around the windows only because i will still need access to my sunroom during the winter months and sealing off the door entirely would mean i couldn t access that room until.
Install window insulation panels.
Foams made of hfc or propane propellants are excellent choices.
Do not use one that has bleach in it.