Warrentdo Posted January 26, 2023 Share Posted January 26, 2023 So im getting ready to spend cash on the protective layer of my plat roof. So, its about 30mtr2, 150 upstand in the middle for the roof lantern and it will have a build in trough running around two lengths so not completely flat. The roof is south facing. I was looking originally at GRP but there may be issues of cracking with hot cold cycling. EPDM but not sure if it the upstand and inbuild trough would be to fiddly. PU? easy enough to paint on but not sure on toughness or guarantee. Any tips, preferences or pit falls anyone? Regards, Warren. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 26, 2023 Share Posted January 26, 2023 GRP properly done will last 40 years. We have just had our old corrugated asbestos roof repaired with a polyurethane, not rained yet so cannot comment on it at all. 1 Link to comment Share on other sites More sharing options...
Radian Posted January 26, 2023 Share Posted January 26, 2023 23 minutes ago, SteamyTea said: GRP properly done will last 40 years. Having patched up GRP boats and cars, it strikes me that it could be more successfully repaired than the other options as well? 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted January 26, 2023 Share Posted January 26, 2023 1 hour ago, Radian said: Having patched up GRP boats and cars, it strikes me that it could be more successfully repaired than the other options as well? Is can, but these new PU resins are marvels of chemistry and can be applied in the wet. I want to play with them, but missed the guy when he did the roof. 1 Link to comment Share on other sites More sharing options...
Jenki Posted January 26, 2023 Share Posted January 26, 2023 For me, having done GRP and rubber. Without a doubt it would be EPDM. A decent installer will have no issues detailing the lantern and box gutters ( I'm assuming that's what you were describing) EPDM can sit in water with no detriment and can easily be patched if it gets damaged. 2 Link to comment Share on other sites More sharing options...
SteamyTea Posted January 26, 2023 Share Posted January 26, 2023 (edited) 10 minutes ago, Jenki said: Without a doubt it would be EPDM After several year, can you safely stand a small scaffold tower, or ladder on EPDM? Edited January 26, 2023 by SteamyTea 1 Link to comment Share on other sites More sharing options...
Jenki Posted January 26, 2023 Share Posted January 26, 2023 2 minutes ago, SteamyTea said: After several year, can you safely stand a small scaffold tower, or ladder on EPDM? Just protect the roof from any sharp edges and no worries. 2 Link to comment Share on other sites More sharing options...
SteamyTea Posted January 26, 2023 Share Posted January 26, 2023 2 minutes ago, Jenki said: Just protect the roof from any sharp edges and no worries. That is what we would do, but others, in the future... 1 Link to comment Share on other sites More sharing options...
Jenki Posted January 26, 2023 Share Posted January 26, 2023 1 minute ago, SteamyTea said: That is what we would do, but others, in the future... As an installer, bring it on😉 1 Link to comment Share on other sites More sharing options...
Canski Posted January 31, 2023 Share Posted January 31, 2023 I visited a small developer friend of mine today and he was shocked when I said I was considering a grp roof. He swears blind by epdm saying that he’s had grp rooves twist and buckle and crack. Then I looked up and saw that his food lantern was clad in chipboard and I got distracted. Link to comment Share on other sites More sharing options...
Marvin Posted February 1, 2023 Share Posted February 1, 2023 Personally I would/have used several times EPDM. (we have our ASHP on it). Unfortunately/fortunately I will not be around to see if it lasts 50 years (5 so far), but if there's a problem with it, I'm sure I'll whinge. Link to comment Share on other sites More sharing options...
Conor Posted February 1, 2023 Share Posted February 1, 2023 Reading this with interest. I've used GRP in the past and was planning it again for my balcony. Is EPDM DIYable? Our roof was fleece lined PVC and after watching the guys do it, would not attempt it myself. Link to comment Share on other sites More sharing options...
Jenki Posted February 1, 2023 Share Posted February 1, 2023 1 hour ago, Conor said: Reading this with interest. I've used GRP in the past and was planning it again for my balcony. Is EPDM DIYable? Our roof was fleece lined PVC and after watching the guys do it, would not attempt it myself. DIY able? a competent hands on person should be ok and if you've done GRP -well, then this will be a walk in the park . there is some very good guides @ EPDM tutorials. a lot of the info in that lot is what they use on the course. Link to comment Share on other sites More sharing options...
Canski Posted February 1, 2023 Share Posted February 1, 2023 I've done quite a few EDPM roofs for myself in the past. The basic flat ones are a doddle. Add any upstands or penetrations and it gets a bit more complicated. I've not had a leak yet. Link to comment Share on other sites More sharing options...
saveasteading Posted February 1, 2023 Share Posted February 1, 2023 I have a fibreglass cover on an area of flat roof with upstands, and it is fine after 6 years. But a big 400m2 roof we had done failed at joints (too big to absorb differential movement?), very expensively as the roofer had disappeared. I therefore favour flexible sheeting with guaranteed seals. For DIY I fancy the stuff that comes in tins simply paints on and becomes a single flexible layer. But there seems less of it about so perhaps there are issues. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 1, 2023 Share Posted February 1, 2023 7 minutes ago, saveasteading said: But a big 400m2 roof we had done failed at joints (too big to absorb differential movement Could be a problem for any material. There are flexible polyester resins, and with a suitable orientated weave, expansion joints could be made. I am willing to work as your consultant about all stuff GRP. 1 Link to comment Share on other sites More sharing options...
saveasteading Posted February 1, 2023 Share Posted February 1, 2023 Car patches to building oligarchs' yachts? Link to comment Share on other sites More sharing options...
SteamyTea Posted February 1, 2023 Share Posted February 1, 2023 2 minutes ago, saveasteading said: Car patches to building oligarchs' yachts? Almost Kayaks to Lord Weinstock country residence. Link to comment Share on other sites More sharing options...
Kelvin Posted February 1, 2023 Share Posted February 1, 2023 We’re using Alwitra Evalon V Link to comment Share on other sites More sharing options...
Dave Jones Posted February 1, 2023 Share Posted February 1, 2023 alutrix followed by resitrix no brainer. Link to comment Share on other sites More sharing options...
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