Green Building Forum - Whats the best flat roofing material for under a 'green' roof...? Sat, 18 Apr 2026 17:43:50 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57700#Comment_57700 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57700#Comment_57700 Thu, 09 Jul 2009 17:07:16 +0100 James Norton
EPDM - DIY able but shrinkage...?

Good old fashioned felt...

Thermoplastic?

J]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57748#Comment_57748 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57748#Comment_57748 Fri, 10 Jul 2009 14:02:12 +0100 James Norton
:sad:]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57757#Comment_57757 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57757#Comment_57757 Fri, 10 Jul 2009 17:36:25 +0100 jamesingram on flat roofs
"best buy
1. pitch roof
2. EPMD , or natural rubber
3. modified bitumen felt
avoid PVC,Chlorinated polyethylene

polyester resin and glass fibre mat scores badly for ozone depletion,acid rain,occupational health,recycling/reuse/disposal
glass fibre felt performed worst for durability of all tested flat roof systems ,particularly at low temperatures
durability is roughly related to price , budjet products are not recommmended"

hope this is of some help

Jim]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57805#Comment_57805 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57805#Comment_57805 Sat, 11 Jul 2009 21:10:53 +0100 James Norton
Surprised about the durability bit though had always assumed it to be pretty bomb proof...

J :sad:]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57806#Comment_57806 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57806#Comment_57806 Sat, 11 Jul 2009 21:33:46 +0100 richy Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57814#Comment_57814 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57814#Comment_57814 Sun, 12 Jul 2009 08:42:27 +0100 tony Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57828#Comment_57828 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57828#Comment_57828 Sun, 12 Jul 2009 14:08:50 +0100 Paul in Montreal Posted By: tonyI have a feeling that the resins used contain high levels of organic chlorineGRP resins do not contain chlorine - they're polyester based. See http://en.wikipedia.org/wiki/Polyester_resin

Paul in Montreal.]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57879#Comment_57879 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57879#Comment_57879 Mon, 13 Jul 2009 16:37:36 +0100 James Norton
thought I'd open it up...

-performance
-cost
-durability

-all balanced against environmental impact good old back of beermat LCA type thing

J

PS If this thread get hijacked by a bunch of "you should have a pitched thatched roof or one with recycled slates etc", I'll not be happy...]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57880#Comment_57880 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57880#Comment_57880 Mon, 13 Jul 2009 16:48:35 +0100 jamesingram 2. EPMD , or natural rubber
3. modified bitumen felt

I guess this must be a good guide as mentioned above ,
'Jon' posted some good stuff on a previous thread , he'd be the guy to ask.]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57881#Comment_57881 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57881#Comment_57881 Mon, 13 Jul 2009 16:53:43 +0100 Roger Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57882#Comment_57882 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57882#Comment_57882 Mon, 13 Jul 2009 16:55:44 +0100 James Norton
J]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57883#Comment_57883 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57883#Comment_57883 Mon, 13 Jul 2009 17:11:41 +0100 Nick Parsons
...and you could have fish...]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57884#Comment_57884 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57884#Comment_57884 Mon, 13 Jul 2009 17:28:54 +0100 James Norton
J]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57885#Comment_57885 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57885#Comment_57885 Mon, 13 Jul 2009 17:36:19 +0100 Nick Parsons Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57886#Comment_57886 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57886#Comment_57886 Mon, 13 Jul 2009 18:45:07 +0100 tony
All he did was lay one layer of felt on the roofing boards ( non t & g), and cover it with 40mm of 10mm shingle -- there was an zinc retainer at the very edge.

60 years no rot no hassel not expensive either. the "flat roof " did have a fall of 1 in 40.]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57894#Comment_57894 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57894#Comment_57894 Mon, 13 Jul 2009 20:46:12 +0100 James Norton
..good job the one in question is going under a 'green' roof... only downside to that is of course if there is a leak...

...feel another change of title coming on...]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57904#Comment_57904 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57904#Comment_57904 Tue, 14 Jul 2009 08:40:58 +0100 Julian Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57905#Comment_57905 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57905#Comment_57905 Tue, 14 Jul 2009 09:01:09 +0100 Nick Parsons
I am not sure I want my input 'combed'. Now my beard, that's another thing.....]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57909#Comment_57909 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57909#Comment_57909 Tue, 14 Jul 2009 09:58:57 +0100 James Norton Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57910#Comment_57910 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57910#Comment_57910 Tue, 14 Jul 2009 09:59:20 +0100 James Norton Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57914#Comment_57914 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57914#Comment_57914 Tue, 14 Jul 2009 10:45:47 +0100 James Norton
However shouldn't tar the whole lot with the same brush (little roofing joke there...? eh...? eh..?)...

So Roofkrete then... only info I can find is that it is apparently the best thing since sliced bread unfortunately this comes from the manufacturers... so would be good to hear more of your experiences Julian...?

(or any other experiences to the contrary...)

J]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57919#Comment_57919 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57919#Comment_57919 Tue, 14 Jul 2009 12:23:07 +0100 fostertom Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57921#Comment_57921 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57921#Comment_57921 Tue, 14 Jul 2009 12:28:13 +0100 James Norton
And what actually is it...?

J]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57948#Comment_57948 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57948#Comment_57948 Tue, 14 Jul 2009 19:43:43 +0100 fostertom http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=174 (ASMET is same stuff as Roofkrete). Unfortunately John Manniex its inventor died recently but his family in co-operation with Oxford Brookes is mounting a fresh campaign to develop and market uses for this amazing material.]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57957#Comment_57957 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=57957#Comment_57957 Tue, 14 Jul 2009 20:18:43 +0100 cookie
Cookie]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58004#Comment_58004 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58004#Comment_58004 Wed, 15 Jul 2009 11:00:41 +0100 Julian
Exactly as Tom describes. He should know he's been to the HQ.

If you are ever in East Devon email me and come and have a look at it in use. Good for green roofs, balconies, flat roofs. Very cost effective and low cement content*. You can lap it over everything so no joins or seams.

*Compared to materials with a much higher cement content!]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58036#Comment_58036 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58036#Comment_58036 Wed, 15 Jul 2009 14:15:27 +0100 RobinB Robin]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58039#Comment_58039 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58039#Comment_58039 Wed, 15 Jul 2009 14:45:17 +0100 bot de paille
*Compared to materials with a much higher cement content!



Ive been try to find out teh ingredients of Roofkrete to get an idea of its eco credentials, toxicity etc
anyone know? or is it a trade secret?


The site looks impressive except for the photo of the grinning reptile on the home page]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58042#Comment_58042 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58042#Comment_58042 Wed, 15 Jul 2009 15:37:32 +0100 Julian Trade Secret sums it up nicely. Even the contactors who install it don't know the exact ingredients. Good luck trying to find out!

It claims to have contain only a small proportion of cement and even then it is as Tom said very thin. So a little goes a long way. As toxic as sand and cement usually is?]]> Whats the best flat roofing material for under a 'green' roof...? https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58046#Comment_58046 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=4252&Focus=58046#Comment_58046 Wed, 15 Jul 2009 16:20:59 +0100 fostertom
Posted By: RobinBSounds as if Roofkrete may not be commercially available at present
Certainly is.]]>