ᐅ Looking for a roof membrane manufacturer from 1996 called "...fil®"

Hello,
our plastic waterproof membrane on the roof from 1996 is under significant tension. The architect and roofer do not want to make any changes despite ongoing work (a small hole was patched) because they claim that the old roof membrane cannot be heat welded to. We are concerned that it might tear soon and cause substantial additional costs.

I wanted to ask the manufacturer if there are any experiences with this. Unfortunately, there are no documents left. However, I found a piece of the membrane with a partially cut-off label:

The membrane is light gray on top and dark on the bottom. The architect says it is PVC. It was covered with extensive green roofing.

Perhaps someone can identify exactly what type of waterproofing we have and which manufacturer I should contact.

Thank you very much for your help.
Best regards

I would say this is Sarnafil from Sika – and you’re in luck, it’s still available (Stuttgart).

And in case anyone asks: it is polyolefin, not PVC...

Thank you very much! That solves the mystery.
Have a great weekend.

Hi,

I just wanted to quickly let you know that a technical application specialist from Sika came by to assess the situation and assist us. It is indeed PVC. This also explains the tension, as plasticizers in PVC are present in high amounts but evaporate over time, which causes the shrinkage.

We hope the membrane will last a few more years.

Regards

Mistakes from the authorities – Sarnafil S is naturally made of PVC. The labeling omits this.