Air sealing windows
I am building a Passive House with double stud walls and all OSB seams sealed with Prosoco Joint and Seam filler. I have plywood window bucks and triple pane windows with nailing flanges installed on the exterior of the rough opening. I need to air seal the inside of the window frame to the plywood window bucks. I would like to fill the space between the window frame and the plywood with foam and then air seal.
I have seen expanding foam at my local box store from Great Stuff, DAP and Hilti. Is there any difference between them? Most gaps are small, from 1/4 inch to 1/2 inch max. I would like it to remain flexible over time and to be a closed cell foam.
After filling the space with foam, I plan to trim the excess so that the foam is flush with inside of the window frame. For air sealing, my plan is to use either Prosoco’s Air Dam or Siga tape. One problem is that the inside of the window frame is not flat, there is a lip around the edge of the window, then an indentation, then the frame is flat. As a result, there is not much space for the Air Dam or tape to adhere to. Will the Air Dam even adhere to the foam? The edge of the window is hard to describe, so I have attached to pictures.
I would appreciate any suggestions on insulating the gap with foam and air sealing the windows.