Just to be clear, I did not say manufactured. I said modular. They built these homes to the BOCA building code and are required to hire inspection agencies to inspect in the factory. I can imagine that some private inspection agencies may overlook some code issues rather than risk loosing the ongoing work. Yes, the stuff falls apart. It appears similar to the paper backing on insulation, but has a smoother surface and is very brittle. I'm not sure you would use the stuff for. I was wondering if this could be the cheapest form of stucco underlayment. Any west coast inspectors ever see anything like this behind stucco?