Flooring in Manufactured housing.

My advice: Stick with plywood floors! If you are buying a manufactured home new, insist on the plywood floors instead of OSB or particle board!! It will cost more but in the end you will have a much sturdier home. So how do you check to see what type of flooring is there? Take a screwdriver with you and unscrew the floor vent/ floor register from the floor. I would do this in a carpeted area in the home because it's easy to lift carpet and look under it. Another piece of advice, the sales person may not really know what is under the carpeting so still insist on having a look even if the sales person thinks that there is plywood there. If the sales person does not allow you to see for yourself, to me that's a red flag! Reason: When particle board gets wet it gets soft and unstable it will not hold a good amount of weight for too long and before you know it, your washer and dryer is falling through the floor and you have a huge hole to repair in your floor. When plywood gets wet it will warp but at least it will hold. Also, you may not be aware that you have a leak and by the time you realize that there is a leak the stability of your flooring has already been compromised! You will want something sturdy underneathe your feet! A family friend that also owns a manufactured home, had a horrible plumbing disaster in his home and had to tear up the entire flooring of his house and replace the OSB/particle board with plywood! Expensive and a lot of work!