Date published: 8 Aug 2019 Author: Glenn Newman, Lisa Rime A finished frame in position. There is a gap between the film/sheet and the original glass that traps air, acting as an insulating layer. Image: Lisa Rime Many Australian houses feature aluminium-framed windows, which perform poorly thermally. But performance can be greatly improved with a simple DIY project. Glenn Newman explains how his friend Lisa Rime came up with an easy system for DIY double glazing.