Astrofoil is similar to Reflectex, but is stiffer and holds it shape better for thermal shutters. Both products are basically polyethylene bubble sheet with a reflective layer on each side. While the bubble sheet is not thick enough to provide a lot of R value, the two reflective layers and the air films on each side of the foil makes for a good R value thermal shade.
|Astrofoil thermal shutters in the open position.|
|Same shutter closed for the night.|
The Astrofoil can be used with or without a frame. The pictures above show the very nice looking DIY wood frames with Astrofoil inserts, and the picture below shows Astrofoil without a frame placed in a window. The frameless version is made by just cutting the Astrofoil a little larger than the window frame opening and pushing it into place.
|The 5 minute Astrofoil shutter -- cut it out and push it into place.|