WILL BYBLOCK LEACH OR PUT MICROPLASTICS INTO THE ENVIRONMENT? ByBlock is a high-performing, insulating building material and is not intended to be exposed to the elements without an exterior covering. This could be one of any readily available products in the market; weatherboard, stucco, paneling, etc. This will protect ByBlock from weather, UV and any environmental degradation.

That’s not a great answer on their FAQs. Basically as soon as any building lacks proper maintenance, it’s able to degrade.