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Products: Best flat roof water proofing membrane with penetrations

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  1.  
    • CommentAuthorShevek
    • CommentTimeJul 30th 2013 edited
     
    What flat roof waterproofing membrane would you recommend for a small roof (6x3 metres) with a number of penetrations (i.e. 4 Ventive vents and 1 SVP)?

    What's easiest to install? What has the best environmental credentials? What has the longest guarantee?

    I've had self-adhesive PDT recommended (i.e. Resitrex SK W).

    And what about GRP (fibreglass) or cold liquid-applied, fleece reinforced resin (e.g. Kemperol http://www.kemper-system.com/UK/eng/liquid-waterproofing/kemperol-2k-pur-solvent-free/ )?

    Edit:
    One reason for us as self-builders not to use Kemperol:
    http://www.kemper-system.com/UK/eng/approved-contractors/
    To maintain the quality of installation, Kemperol V210 and solvent-free 2K-PUR waterproofing and related surfacing systems are only installed by approved and certified contractors

    We need something we can install ourselves.
    • CommentAuthorjamesingram
    • CommentTimeJul 30th 2013 edited
     
    GRP easy to DIY and detail round penetrations, just cut matting to suit , though harder to if you want it to look top notch.
    Am I right in thinking this bit of roof is on top of a loft conversion, so looks not so important ?
    messy to work with though.
    Flat roof waterproof membrane, fibre glass
    http://www.greenbuildingforum.co.uk/forum114/comments.php?DiscussionID=9988&page=1#Item_18
    • CommentAuthorShevek
    • CommentTimeJul 30th 2013
     
    Yeap, correct James, top of loft conversion, thanks.
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 31st 2013 edited
     
    Posted By: jamesingramGRP easy to DIY
    Not if you want it to last, especially if it is part of a green roof substrate.
    We had a thread on it a while back. You know it had to be dry before you can apply it :wink:
    •  
      CommentAuthorjoe90
    • CommentTimeJul 31st 2013 edited
     
    Sorry ST but I disagree, I have done quite a few GRP flat roofs and gulleys and as long as you can follow simple rules you can achieve a very good result. Our local GRP supplier does free half day courses (bristol- whisper for details) and this is all you need to achieve a first class result. All manner of preformed upstands and corners are available and a doddle to use. Some have mentioned that GRP can deteriorate in sunlight but I have seen humdreds of boats left out in the sun and they still float:bigsmile:

    P.S. ST is right it has to be dry but thats not hard to achieve.
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 31st 2013
     
    UV stability is generally not a problem with polyester resins, epoxies are better.
    Oddly enough one thing that polyester resins does not like is constant immersion in fresh water (why the 'osmosis' problem is greater for river boats than sea boats).
    I agree that anyone with some half decent practical skills can do it with a bit of advice/training, it is more about what you do when it is going wrong.
    Main point is that for it to last 40 or 50 years without problems then care needs to be taken.

    I think that GRP should be used a lot more in the building trade (I liked the stone pillars I made for the Excelsior hotel at Heathrow, almost looked real).
    • CommentAuthorShevek
    • CommentTimeJul 31st 2013
     
    Presumably GRP will be fine laid over Magnesium Oxide board?
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 31st 2013
     
    Not sure, it does not work with plaster, is unreliable with newish concrete. Best way would be to try a sample and see.
    •  
      CommentAuthordjh
    • CommentTimeJul 31st 2013
     
    Posted By: ShevekPresumably GRP will be fine laid over Magnesium Oxide board?

    Posted By: SteamyTeaNot sure, it does not work with plaster, is unreliable with newish concrete. Best way would be to try a sample and see.

    Could you just use a polythene slip sheet between if there is a problem? i.e. DPM or similar
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 31st 2013
     
    Posted By: djhCould you just use a polythene slip sheet between if there is a problem?
    Yes, but then you may as well lay up some flat sheets in the warm and dry, cut to shape and just lay up over the joints. What we did for most jobs as it was quicker, easier, cheaper, tidier and just better if done right.
  11.  
    Shevek , check out install vid on my other link.
    •  
      CommentAuthordjh
    • CommentTimeJul 31st 2013
     
    Posted By: SteamyTea
    Posted By: djhCould you just use a polythene slip sheet between if there is a problem?
    Yes, but then you may as well lay up some flat sheets in the warm and dry, cut to shape and just lay up over the joints. What we did for most jobs as it was quicker, easier, cheaper, tidier and just better if done right.

    Indeed, if you can do it on a table indoors, it will be much easier.
    •  
      CommentAuthorSteamyTea
    • CommentTimeAug 1st 2013 edited
     
    Posted By: djhif you can do it on a table indoors
    When I was a kid I made a couple of kayaks in my parents garage. The food from the freezer tasted a bit odd :bigsmile:
    • CommentAuthorRex
    • CommentTimeAug 16th 2013
     
    What about EDPM? I used it on the flat section of my garage roof 12m x 3m although I do not have nay penetrations. Is it s single sheet with factory welded seams. There are accessories for penetrations.
    • CommentAuthorShevek
    • CommentTimeAug 16th 2013
     
    I've had a couple of people warn me against using EPDM with lots of roof penetrations. We've used it on our lower roof but the only penetration there is an internal gutter.
  16.  
    We used GRP to fix all the leaking valleys in our listed (small) Hall in the 1980s, and they lasted the best part of 25 years.

    One of the key things is to avoid structural stress on the GRP.

    We stripped back the tiles and installed plywood 3ft up the line of the roof to allow for snow and GRP'd over that, before replacing the tiles. I can't remember the precise detail.

    The places with what problems there were were where people could walk on joints by mistake.

    It is also nice and repairable.

    We also installed translucent roof panels in the middle of slate roofs in a listed building, made from GRP "slates", which were undetectable, but that's another story.

    I'd say that if your penetrations don't move you should be OK.

    Ferdinand
    •  
      CommentAuthorSteamyTea
    • CommentTimeAug 16th 2013
     
    Posted By: ferdinand2000We also installed translucent roof panels in the middle of slate roofs in a listed building, made from GRP "slates", which were undetectable, but that's another story.
    Would like to hear about that.

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