grp

  1. R

    Balcony Render Advice

    Hi all, hoping someone can advise on best option please. We are doing a GRP roof on this balcony as it was previously leaking. We are fitting OSB boards at the moment but debating what ideally we should use to render the surrounding wall down to the floor area. We plan on bringing up the GRP...
  2. R

    having a huge dormer built.

    We are in the process of having a huge dormer built. The approved drawings the builder is working from says single layer membrane roof covering bonded to19mm plywood, also sides from 25mm plywood (exterior grade ply). The builder has used 11mm OSB3 board all over (also gaps all over between...
  3. L

    Repairing a GRP roof (ed.)

    I’m currently in the middle of an extension with a flat roof, parapet wall and a sky lantern. The flat roof has a GRP surface. We have had pretty substantial leaks at the edges below the parapet wall and also the corners of the roof lantern. I think plan A for my builder is currently to put...
  4. C

    GRP warm roof got wet

    Hi all, I have recently installed a warm GRP flat roof on my extension, the roof is 90m² with a parapet wall all the way around and and a hidden box gutter built in and two 3000mm x 1000mm flat roof. Due to the size of the roof, a few fiddly details and doing it on my own i have had to do the...
  5. G

    Please help bad GRP which has cost £7000!!

    Hi, I’m looking for advice. We have had a terrible GRP roof done on a kitchen extension. There are holes, rips, parts which have no coating. You can see all the matting. The company have admitted the faults. They claim they will fix them but I don’t want them to just patch it up! Has anyone...
  6. S

    GRP and twin-walled chimney

    Hi DIYNotters, I have a flat GRP roof installed by a builder, through the roof is a twin-walled chimney from a wood burner. Roof was installed 3 years ago. The builder (reputable) replaced a flat felt roof including the boarding and ran the GRP up to the twin wall flue without flashing. We used...
  7. S

    Help! GRP roof is bubbling 6 months on?

    Guys I decided to embark on a DIY bay window GRP roof....never again. Anyway it looked fine and more importantly it's been waterproof ever since. Fast forward 6 months, I have just noticed bubbling on one side? I have no idea why and hope you guys can help. Will it be fine? No water leaking...
  8. B

    Roof light on 18 degree roof pitch

    Hi all I'm fitting three roof lights into a new pitched roof. Lots of connections to other walls so going with a GRP roof covering. I aimed to put in a velux rooflight but the website doesn't show any installation details for a warm roof, and really I think all new roofs should be warm these...
  9. H

    Warm roofing and GRP Fibreglassing Single Storey Flat Roof

    Looking for advice please. I've got a flat roof single storey bathroom that needs a new roof and I've looked at GRP Fibreglass as the route to go down. I also wanted to insulate the flat roof and have read all the advice stating that a warm roof is superior to a cold roof. If the Celotex for the...
  10. M

    Banging fibreglass roof

    We had a new 45m2 warm construction flat fibreglass roof installed in October. It makes intermittent loud banging and creaking noises. It is worse during the morning and evenings when the sun rises/sets and the temperature rises/falls. The roof is south facing. I have found numerous old threads...
  11. T

    Large flat roof. Best covering options?

    Hi all, I’m having a flat roof on an extension I am building and the area is approximately 8m x 6m - 48m2 (not taking into account the skylights) please can anyone recommend a roofing system that’s suitable for large areas such as this. It will be visible from the upstairs windows but I...
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