I would like to warn you to use extreme caution when ordering a replacement RV roof. There are products being sold in this market that would not be allowed on a commercial roof. Commercial roofing products are typically sold in .045 mil thickness and .060 mill thickness. They have a warranty of 10 to30 years and have over 40 years of performance testing on EPDM roofs. If this is the case for stationary commercial roofs, then why are replacement RV roofs being sold in .030 mil thickness? An RV is not stationary, and using thinner and improper material's will shorten the life of your RV roof.  

We need to remember that all RV rubber roofing technology originally came out of the commercial roofing market and their minimum standard for thickness for a commercial roof is .045 mil. So, now that you know more information, which would you choose: a thinner liner, or a thicker liner that is tested and proven with over forty years in the roofing industry?