Skyline 210NR Notch Reinforcers have been thoroughly tested and are compliant with International Building Codes as long as they are installed according to the instructions and limitations provided. When backup documentation is needed we can provide a Engineer Stamped Instruction Letter to satisfy Code officials at a cost of $50. The document is provided in PDF form via email to the email address provided with your order. Turn-around is approximately 3-4 working days.