Did you know we pack our high-performance enclosures with wood throughout? It's true! Using Timber HPs Timber Fill we're able to insulate the cavity with wood fiber and we use ridged wood fiber in walls/roofs when needed as well. Timber Fill is rot and fire resistant, creates a really quiet interior with it's acoustical properties, is a great thermal barrier (keeping your interior temperature just right), and is made out of the carbon-sequestering goodness of wood.