The Story of the Truth Window


When you’re new to straw bale building, one of the first things you may notice or hear about is the “truth window.”

What exactly is this feature? It seems to me like a fun little joke within the community of straw bale builders and/or homeowners, where a small part of the wall (interior or exterior) is left without plaster, so that the straw is visible. This acts as proof to unbelieving guests and visitors that the walls are actually insulated with straw bales.

The truth window opening is covered with non-removable glass, left open, or has a door that opens and closes to allow the straw to be both seen and touched. However, we STRONGLY recommend sealing this section of the wall and detailing it well to prevent air and moisture from moving through the walls via this penetration. A simple pane of glass embedded in the plaster should do the trick.

Designing a truth window is a fun process where you can express your style and individuality by customizing the trim, shape, or other features. A quick online image search can give you inspiration, or check out a few we’ve worked on and around.