Not signed in (Sign In to the Green Building Forum)
Categories
- General
- Essential for Newbies
- Building Regulations and Standards
- Commercial build
- Data and monitoring
- Downshifting
- Energy Assessment
- Events and Courses
- Fundamentals
- Green Building Bible
- Green Building magazine
- Green Living
- Heating and cooling
- Housing - New Build
- Housing - Renovation
- Offers and wants
- Politics
- Products
- Renewable Energy
 |
||
|
Vanilla 1.1.4 is a product of Lussumo. More Information: Documentation, Community Support.
Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications:: Apply now.
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications:: Apply now.
-
- 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. -
- CommentAuthorjamesingram
- CommentTimeJul 23rd 2012
EPMD , is to install , protected from UV and damage by green roof . long life . -
- CommentAuthorMike George
- CommentTimeJul 23rd 2012
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
-
-
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
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. -
- CommentAuthorchippyclaus
- CommentTimeJul 24th 2012
we used EPDM on our utility extension, installed by local specialist with 20 years warranty. Better material and longer life then traditional felt. -
- CommentAuthorMike George
- CommentTimeJul 24th 2012
I said leak, not sink
-
-
CommentAuthorSteamyTea
- CommentTimeJul 25th 2012
-
-
- 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?
1 to 16 of 16
