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Housing - Renovation: Flat roof waterproofing membranes

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  1.  
    • CommentAuthorShevek
    • CommentTimeJul 18th 2012 edited
     
    Trying to decide on a waterproofing membrane to go on a flat roof plywood/osb decks (one with a green roof on top). What do you recommend?

    We tend to specify cold-applied liquid polymer resin a lot at work because it goes up and over any surface, and never leaks, but I don't know much about the environmental credentials of these products. They're probably more expensive than other options too. Kemperol have a solvent-free option called 2K-PUR:
    http://www.kemper-system.com/UK/eng/liquid-waterproofing/kemperol-2k-pur-solvent-free/
    Has anybody used this before?

    Greenspec's pros and cons page here:
    http://www.greenspec.co.uk/flat-roof-coverings.php although they don't appear to cover cold-applied liquid polymer resin.

    Are there any options like Roofkrete that don't involve hydrocarbons?
    • CommentAuthortony
    • CommentTimeJul 18th 2012
     
    I always use torch on felt, 4mm high performance elastomeric. Good falls are essential, drainage layer, fail safe design, no silly upstand at bottome edge of the roof.

    Fall minimum 1:30 in my book but I have never done one this shallow nor have any I did ever leaked.
    • CommentAuthorShevek
    • CommentTimeJul 23rd 2012
     
    Is torch on felt suitable for under a green roof?

    Another factor: which is easiest to install, i.e. are any suitable for DIY? Or are we always going to need a roofer/installer?
    • CommentAuthorRobinB
    • CommentTimeJul 23rd 2012
     
    We had our green roof 11 degree slope and a small balcony about 3 degrees - done by Joe at the Better Roofing company in Lancaster who used to post useful comments here.

    He used either Alwitra or Spectra roof - I think Alwitra. Both areas seem good as new as when he installed 2 years ago. Not easy to see under a green roof but after all the rain we've had a good test.
    • CommentAuthortony
    • CommentTimeJul 23rd 2012
     
    The ones I did with torch on are still there after twelve and sixteen years, the green goof protects the roof covering so I am expecting that it won't leak for ages yet.
  6.  
    EPMD , is to install , protected from UV and damage by green roof . long life .
  7.  
    I use fibreglass. Yet to see a leaking canoe
    • CommentAuthorjamesingram
    • CommentTimeJul 23rd 2012 edited
     
    Posted By: Mike GeorgeI use fibreglass. Yet to see a leaking canoe

    Took my mates old canoe to the river years back and sunk it. Left out in the sun all the time the fibreglass had degrade and had worn thin .
    Mind you we had been sledging in it the year before :bigsmile:
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 23rd 2012
     
    Canoeing is how I got into the composite plastics game in the mid 70's.
    I had one sink on the River Dart, was quite frightening as I was begin dragged down with it.

    The right choice, and amount, of pigment can make a difference to the weathering properties. As can the choice of resins used.
    Have I mentioned that if you are going to sheath a roof in GRP it needs to be very dry, not a drop of moisture. Not even the nights dew that seems to vanish by 8AM. Must have mentioned that before :wink:

    Apart from that, it is fantastic material if done right, we don't use it enough.
    • CommentAuthormike7
    • CommentTimeJul 24th 2012
     
    Shevek - how big is the roof, and where are you? I have some very large offcuts of epdm free if you can collect.
  11.  
    we used EPDM on our utility extension, installed by local specialist with 20 years warranty. Better material and longer life then traditional felt.
  12.  
    I said leak, not sink:fingersear:
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 25th 2012
     
    :bigsmile:
    • CommentAuthorTimSmall
    • CommentTimeJul 28th 2012
     
    The bloke which I'm planning to get to do my green roof seems to know his stuff (based in Brighton, but seems to do jobs in London, Bristol and elsewhere) - he uses EPDM...

    His site links to this:

    http://www.greenroofcode.co.uk/

    "Green Roof Code of Best Practice for the UK 2011"

    Cheers,

    Tim.
    • CommentAuthorShevek
    • CommentTimeFeb 5th 2013
     
    So EPDM seems to be the most popular. With the sizes we'll need we'll be able to do it without any joins too. Can anyone recommend a particular EPDM product?

    No one out with experience of cold applied liquid membranes?
    e.g. http://kemper-system.com/CA/eng/applications/kemper-eco-roof/kemper-eco-roof.html
    Guess with these you tend to need an approved installer...

    Or TPO (thermoplastic polypropylene)?
    Why is TPO popular choice of green building? Is it more environmentally friendly than EPDM?
    • CommentAuthorNovice1
    • CommentTimeMar 5th 2013
     
    Also interested in EPDM for a large 11x17m flat roof. AFAIK TPO seems to be unproven and just fashionable with architects because of the variety of colours (may be wrong)
    Liked EPDM as;-
    1. no joints, large membrane (these guys do up to 30x15m and sell to us self builders http://www.rubba-seal.co.uk/)
    2. DIYable
    3. last 20-50years
    4. Cheap @ £6.65/m2 (anybody found cheaper?)
    Conflicting recomendations about fleecebacked v. normal EPDM
    5. Like Shevek interested to know are all EPDM membranes much the same?

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