Recycled green XPS issue – GreenBuildingAdvisor

Hi there,

There is this company that recycles polystyrene and makes XPS sheets out of it. 100% recycled.

I placed an order for some XPS 2″ R10 with a PSI rating of 40, as I need to place them under a heated garage pad and heated driveway.

The order I received has a mix of new sheets with a normal white colour and of some that are changing colour, getting brown, most likely because they were seating outside under the sun till I bought them.

All the ones that are changing colour, have a crack at the same location. 

I reached out to the manufacturer and they said its most likely bad quality control and is offering to replace them. I just found weird that only the “old” sheets are cracking.

The heated garage and driveway is a costly project and I am now worried that using this type of recycled foam will create some issues in the future. We can not have the foam break down under the concrete, especially with PEX tubing running through it.

This foam recycling company is new, they started doing this in 2022 so there is not many long term reviews.

Any suggestions?