TPO roof understanding help.

The outer skin is TPO. TPO comes in several grades, 45, 60 and 80 mil. Thicker is more commonly used for commercial applications. The big "win" for TPO is that all seams should be "heat welded", not just glued. A special tool is used to melt the two pieces together.

If done properly no caulk/sealants are required, EVER ! Anything coming through the roof should be mounted on "curbs"/"pedestals" and the curbs should be covered in TPO and "welded" to the roof.



Any roof will last longer if washed and a sprayed with a UV protectant once or twice a year. Storing out of direct sun will add to any roof's life expectancy.

I just realized, the OP has a Jayco RV. When did Jayco start using TPO and and vacuum bonded laminate roof ?

I've had EPDM and TPO single layered roofs on several different trailers and they will outlast the lap sealant used, hence the reason for inspection.

The best product you can apply to your roof is Aerospace 303 UV protectant several times per year. Imo

I called Alpha (the manufacturer of my TPO material) when I got my current camper in 2011 because I had seen so much conflicting information in various forums. They said to just wash the roof with Murphy's Oil Soap once or twice per year. They said the soap leaves a little oil behind which lubricates the TPO and keeps it supple. It still looks fine.

The cloth is used as a reinforcement. A rubber roof EPDM does not have this reinforcement. TPO is a thermoplastic material and is much more durable than EPDM. Having said that my EPDM roof is 24 years old and has never leak, so I would not worry about the durability of your roof as long as you check the sealant around the cutouts and recaulk as required.

As always, thanks for taking the time to fill me in. Maintenance. It's all about proper maintenance..