We are adding new siding to a 1920s house and plan on keeping the wooden window frames. As the house did not have sheathing behind the old siding, we are adding sheathing and Tyvek house wrap. What would be the best way to seal the areas around the window & door frames before the siding is added? I've seen on episodes of TOH, where they put what looked silver metallic tape to the edges of the window & door frames to prevent water from getting behind the frames. What is this tape & is that the best way to seal them off or is this only used when replacing windows? Thanks for the help.