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Another 'help is this GRP roof acceptable or not' thread

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25 Apr 2025
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Hi,

Hoping I can get some advice from any roofers/anyone experienced in GRP fibreglass flat roofs. Thank you!

We had a leak on our flat roof and agreed with what appeared to be a reputable roofer (couldn't find a local recommendation so had to go with online reviews...) that the existing GRP fibreglass roof would be sanded back to the woodwork and a new GRP fibreglass roof laid on the existing boards.

Prior to the work the discussions I had were reassuring however when it came to do the work I became concerned for a number of reasons, but primarily the fact that they went ahead and laid the matt/resin knowing it was going to rain heavily that evening and the roof was left uncovered.

Indeed 2-3 hours after they finished laying the matt/resin, we had heavy rain for several hours. I pressed them on this when they came back to lay the topcoat but they assured me it 'looks fine' and 'it had dried by the time it rained', but I believe it needs to be dry for 24 hours to properly cure? It's a 3rd floor roof and I'm not one for heights so unfortunately I wasn't comfortable going up to check anything myself.

Next alarm bell was being asked for towels to mop up water when they returned 48 hours later to lay the top coat, again something from my research is a no no and the surface should be completely moisture free before applying the top coat.

I now have a photo of the finished roof which with my limited understanding, appears to be absolutely terrible? Of course the roofers assure me this blotchy finish is normal and absolutely fine and 'don't worry it isn't going to leak'. ChatGPT suggests that indeed these blotchy patches are a sign of moisture contamination and that the roof is unlikely to last long in this state.

Would really appreciate anyone with any experience to give their opinion on whether there are any arguments to make that this is somehow okay? Do we think a sand back and fresh topcoat applied correctly should be an acceptable resolution here or demand the whole thing is redone?

Many thanks!
 

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Last edited:
probably needs resanded back to base layer and cleaned with acetone.
If moisture hasn't penetrated base layer you can apply a new topcoat .
 

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