https://safeindustrial.co.uk/things-you-need-to-know-about-anti-slip-stair-treads-and-nosings/#:~:text=According%20to%20the%20UK%20Building,a%20minimum%20of%20300mm%20wide.
下麵那個在南加,用上好原木當柴火燒的,賣房子的王什麽,
你幹的樓梯不規範,
保險公司可能不讓過