This article is not a step-by-step instructable on how to replace your RV floor. That’s because there are a hundred of those instructables online and in popular forums like FiberglassRV.com and iRV2.com. Also on YouTube. May I recommend this one from Brian at RVwithTito.com?

But if you’re struggling with a damaged RV subfloor, then I recommend you START here. You won’t finish here (you’ll wind up on one of those 42-point DIY instructables), but this article will get you aboard the right flight. Because here’s a dirty secret:

RV manufacturers generally consider a damaged subfloor a totaled camper.