Prefabricated Straw-Insulated Wall System
R40
Effective wall insulation value
The walls were prefabricated near Leduc, Alberta using advanced framing techniques designed to reduce thermal bridging. Wall cavities are filled with chopped straw, creating a 12-inch assembly with effective insulation over R-40.
Why It Matters01
A wall built for Calgary’s climate.
The 12-inch assembly delivers high insulation performance, reduced thermal bridging, and an exceptionally quiet interior. Heating demand drops year-round.
Chopped straw is an agricultural by-product. Using it displaces high-carbon fiberglass or foam, and stores the carbon the plant captured while it grew.
Key Features02
A12″ thick wall assembly
BPrefabricated panel construction
CChopped straw insulation
DHigh-performance weather barriers