A healthy indoor air environment can be achieved only when you build with healthy materials. SIREWALL is non-toxic. Like stone, it’s free from any of the toxins that can be found in more traditional wall systems. It doesn’t require fungicide like commercial wood because it is naturally mold resistant. It doesn’t require formaldehyde, adhesives, plastics, vinyl, synthetic finishing products, or any other poor indoor air quality culprit because SIREWALL is not susceptible to the damage and decomposition those products have been designed to curtail.