RV Underbelly Material

Plastic material that is very similar to cardboard

Many people wonder what the material is that covers the underbelly  of an RV.

If you look at it, it looks exactly like cardboard. But it clearly is a material that is waterproof like plastic.

Look no further, the material is called Coroplast and you can find a manufacturer of it here (  http://www.coroplast.com )

Please share what you know with other campers. Your input helps everyone!