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Thread: Fibreglass roof

  1. #1
    Craftsman eletos's Avatar
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    Fibreglass roof

    Had a fibreglass roof put on a new extension. Iíve seen this stuff installed before, not sure the builder did a particularly good job of it. Lumps and bumps in places and the odd leak here and there!

    I would have thought all the fibres should be totally encased in the top coat? There seems to be a number of areas that have pinholes, which is a potential route for water ingress.




    Iím going to suggest the lumps are sanded and a new top coat applied as it doesnít seem right to me. Anyone else installed this stuff?



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  2. #2
    Craftsman Arcam's Avatar
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    I am not an expert but that looks like a poor job, I would have expected the top gel coat to be smooth and uniform.

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  3. #3
    Grand Master number2's Avatar
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    Quote Originally Posted by Arcam View Post
    I am not an expert but that looks like a poor job, I would have expected the top gel coat to be smooth and uniform.

    Sent from my SM-N960F using Tapatalk
    ^^^^^ This, the roof looks like it was done by someone who didn't know what they were doing.
    "Once is happenstance. Twice is coincidence. The third time it's enemy action."

  4. #4
    Journeyman
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    That is an awful job, you should not be able to see any of those fibres at all, the resin coat should be smooth and uniform...
    It definitely needs revisiting...

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  5. #5
    Master
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    There was a similar case on Watchdog this week, roof was deemed rubbish, worth watching on I Player if itís on.

  6. #6
    Looks like he's run out of resin and called it a day.

  7. #7
    Grand Master JasonM's Avatar
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    A few frost cycles in those gaps is going to cause issues.
    Cheers..
    Jase

  8. #8
    Journeyman
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    I had it installed you will need it to be sanded down and to put another coat if not 2 of resin. Small pin holes will allow water to go through.

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  9. #9
    That is a shockingly poor installation. I hope you are able to have them back to redo it.

  10. #10
    Grand Master
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    My extension with roof light is fibreglass, mine is smooth finish, that's an abortion of a job!!

  11. #11
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by eletos View Post
    Had a fibreglass roof put on a new extension. Iíve seen this stuff installed before, not sure the builder did a particularly good job of it. Lumps and bumps in places and the odd leak here and there!

    I would have thought all the fibres should be totally encased in the top coat? There seems to be a number of areas that have pinholes, which is a potential route for water ingress.




    Iím going to suggest the lumps are sanded and a new top coat applied as it doesnít seem right to me. Anyone else installed this stuff?



    Sent from my iPhone using Tapatalk
    Looks like a few more coats needed tbh.
    Fast is fine, but accuracy is everything.

  12. #12
    Thatís not good. Firstly thereís not enough Resin in the matting, itís should be smooth and solid when sanded down before a top coat is applied. The top coat is there for UV protection and for a nicer cosmetic appearance, not to make the Roof water tight.

    Honestly Iíd ask then to start again as sanding down a whole roof and cleaning it off properly takes longer than to over board and start again.

    Most GRP roofs are guaranteed for 10/15/20 years by the contractor and also the materials manufacturer, but materials manufacturer wonít guarantee that roof based on your pictures.

    (I run an online business selling GRP to roofers and Iím a partner in a GRP specialist installation company, who are often asked to rectify badly installed roofs).

  13. #13
    Craftsman eletos's Avatar
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    Thanks for the comments. When the matting went down there didnít seem to be enough resin applied for my liking.

    Iíll see what he has to say tomorrow.

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