This 7 to 9 year old TPO has been repaired many times. It was originally black, but the manufacturer stepped up at some point and paid for the coating (which is not doing a lot of good, as you can see here). In fact, we’ve never seen anything that looks quite this bad.
So what went wrong? We’ll never know for certain but here are four probable causes:
- Wet primer or glue when installed
- Overheating the patch material
- Incompatibility of the patch material
- Poor installation and cleaning of membrane
At first the Garland rep asked to analyze this roof thought it might be a reaction from the coating being applied to the repair material. However, the uncoated patches are also blistering. In fact, 85 to 90% of the repairs are experiencing the same blistering/ bubbling issues. It would be nearly impossible for even the worst roofing crew to screw up every patch.
Here’s our best guess: the patch material/ primer was not compatible or was in some way faulty. What do you think?