Life of Mylar Storm Windows

Gary,

I read about your double Mylar storm windows.  I built Mylar storm windows for our house 25 years ago and am still using them. A couple I had to replace the Mylar because our dog punched holes with her claws.  I used 5/4 by 4 clear fir ripped in half, which gave me 1” by 1.75” wood. I built the frames about ¼ “ smaller than the window and used foam weatherstrip all around, and doublestick tape to attach the Mylar.  I think I used 3 or 4 mil.

Warren