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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Products: Thermoplastic roofing membranes

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  1.  
    • CommentAuthorMike George
    • CommentTimeSep 4th 2007 edited
     
    I am overseeing an extension which requires a flat roof. The above has been suggested to me. The problem is that I know nothing about it. Anyone help? Is it good bad or ugly? Is there a better solution? Roofcrete? Fibreglass?
    • CommentAuthorTerry
    • CommentTimeSep 4th 2007
     
    We looked at these for our flat roof, but they are relatively expensive and we couldnt find someone to supply on a DIY basis. Supposed to be fully recylable.
    From memory, I think the one company we spoke to was called Rubberfuse. Will try to find some more names
    Alternatives are butyl or epdm. Again lots of companies are happy to charge a lot of money to install, but there are definitely DIY suppliers.
    We got very bad response from butyl suppliers - make that no response to phone calls and drawings sent etc so opted for epdm.
    Have read on this forum about someone using mechanically fixed epdm, but to me it makes little sense to punch a lot of fixings thru a waterproof membrane. There are options for glueing it to a substrate or lose laying and ballasting with turf or agregate.
  3.  
    Thanks Terry. I will investigate EPDM. The roofer is coming to tell me all about thermoplastic tomorrow so I will also see what he has to say.
    • CommentAuthorMike George
    • CommentTimeSep 5th 2007 edited
     
    Is EDPM really as easy as this? http://www.delston.co.uk/diy.htm
    • CommentAuthorTerry
    • CommentTimeSep 24th 2007
     
    Mike
    EPDM does seem to be relatively easy - mind you we have yet to do all the edge detailing on ours, but so far cant foresee any problems.
    One thing I can confirm though is that there is a noticable amount of shrinkage as our membrane was loose laid for about 9 months as a temporary cover.
    Someone, possibly Keith, quantified it as about 300mm per 10m which is roughly what we found. Sadly didnt take very accurate measurements as we had been prewarned and the membrane was supplied with a bit extra so was not a major concern. Presumably now that we have glued it to the deck this will stop, or at least once it is turfed.
    How did your meeting with the thermoplastics man go?
    •  
      CommentAuthornigel
    • CommentTimeSep 24th 2007
     
    Greenspec recommend a TPO or a EPDM http://www.greenspec.co.uk/html/materials/flatroofs.html for a flat roof.
  7.  
    Hi Terry, I am afraid I just didn't have the confidence to go with EDPM and I am glad now, given the shrinkage point you mention. I wanted to see an example for myself or get a recomendation from someone who had used it, but I did not get any success. Prime Cost wise, it was the best option, but I went with glassfibre in the end as other solutions were cost prohibitive to the client.
    • CommentAuthorTerry
    • CommentTimeSep 24th 2007
     
    Hi Mike
    fair enuf. The shrinkage is not an issue if you are aware of it and make allowances.
    You are welcome to pop over and see ours if you like as seem to recall you were in S Wales and we are in the Forest of Dean - west Glos, not a million miles away.
  9.  
    Thanks Terry, I might well take you up on that, my mother is from Yorkley so I know the area a little. Which part do you live?
    • CommentAuthorTerry
    • CommentTimeSep 24th 2007
     
    Mike, we are near Cinderford

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