Makeitstop Posted January 10, 2021 Share Posted January 10, 2021 Hi folks, Choice for single story extension, epdm, grp or pvc? From experiences of those who have used or fitted, which one and why? Would appreciate hearing any views on it. Thanks all. Link to comment Share on other sites More sharing options...
nod Posted January 10, 2021 Share Posted January 10, 2021 I had the same dilemma a couple of years back when I did ours I’d absolutely no experience of either But went with fiberglass due to it being virtually indestructible Should one of the many slates that I fixed above fall 1 Link to comment Share on other sites More sharing options...
tonyshouse Posted January 10, 2021 Share Posted January 10, 2021 Hopefully not flat, min fall 1:40 asphalt for me if you must have a flat roof, I won’t entertain them, nor parapet walls Link to comment Share on other sites More sharing options...
joe90 Posted January 10, 2021 Share Posted January 10, 2021 +1 for GRP, indestructible but very weather dependant when installing. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 10, 2021 Share Posted January 10, 2021 GRP for me, but then I have been playing with it for 45 years now. Link to comment Share on other sites More sharing options...
nod Posted January 10, 2021 Share Posted January 10, 2021 28 minutes ago, joe90 said: +1 for GRP, indestructible but very weather dependant when installing. Your right there Joe Ive a friend who builds boats His exact advise Everything must be bone dry and no chance of rain Ours runs to a drain at either side So not exactly flat roof Nothing could ever come through it It is like the bottom of a boat 1 Link to comment Share on other sites More sharing options...
Makeitstop Posted January 10, 2021 Author Share Posted January 10, 2021 Thanks for the replies everyone. @ Nod.... What is the overall dimension of your roof in the image, and was this a contractor job or DIY, how long has it been on, and, are you pleased with it overall? @ Joe90 and Steamytea... do you have any of this on your current properties and if so, I ask you the same as above to Nod. @ Tonyshouse... Why Asphalt.?... Why not flat roof (obviously not dead flat) and why not parapet walls, especially if done properly.? Does anyone have any knowledge or experience with PVC.?...such as Armourplan? Link to comment Share on other sites More sharing options...
Russdl Posted January 10, 2021 Share Posted January 10, 2021 7 hours ago, tonyshouse said: nor parapet walls +1 to that question. What's the issue there? Crud building up behind them blocking drainage? Link to comment Share on other sites More sharing options...
joe90 Posted January 10, 2021 Share Posted January 10, 2021 2 minutes ago, Makeitstop said: @ Joe90 and Steamytea... do you have any of this on your current properties and if so, I ask you the same as above to Nod. I speak as someone who has diy ed my own small porch roof but have done roof galleys, parapet gutters and flat roofs fir customers in the past when I was a builder. I never had a problem with a roof I did but was extremely careful regarding weather (refusing to do roofs in winter). Link to comment Share on other sites More sharing options...
SteamyTea Posted January 10, 2021 Share Posted January 10, 2021 (edited) 9 minutes ago, Makeitstop said: do you have any of this on your current propertie God no, would not be allowed down where I am, too close to a World Heritage Site, SSSi and AONB. Anything made after Trevithick improved the steam engine is frowned upon as too modern and untrustworthy. But some GRP cladding, walkways and stone like pillars i made, are still about, after 4o years. Edited January 10, 2021 by SteamyTea Link to comment Share on other sites More sharing options...
joe90 Posted January 10, 2021 Share Posted January 10, 2021 Just now, Russdl said: What's the issue there? Crud building up behind them blocking drainage? And lead cracking due to old age/fitting badly, I used to replace with GRP, no joints, bullet proof. Link to comment Share on other sites More sharing options...
Makeitstop Posted January 10, 2021 Author Share Posted January 10, 2021 1 minute ago, SteamyTea said: God no, would not be allowed down where I am, too close to a World Heritage Site, SSSi and AONB. Anything made after Trevithick improved the steam engine is frowned upon as too modern and untrustworthy. But some GRP cladding, walkways and stone like pillars are still about, after 4o years. Haha, Oh, like that is it. Link to comment Share on other sites More sharing options...
Makeitstop Posted January 10, 2021 Author Share Posted January 10, 2021 My plan does have a parapet wall, so I'm curious to know what any problems people have had with them may be. In the design I have, the plan is to use zinc copings fabricated to suit, as there is an element of zinc (maybe PLX) cladding to part of the rear wall and part of one side wall. I liked the idea of the parapet as it offers some aesthetic appeal in limiting the visibility of the roof light / lights. Link to comment Share on other sites More sharing options...
joe90 Posted January 10, 2021 Share Posted January 10, 2021 I don’t think parapet walls are bad if designed right and made properly. Some parapet walls are in front of large sloping roofs so the amount of water being held back is large. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 10, 2021 Share Posted January 10, 2021 A bit of creative designing and I am sure that drainage areas could be built in with GRP. But I always think of Nigel Pargetter's scream. Link to comment Share on other sites More sharing options...
PeterW Posted January 10, 2021 Share Posted January 10, 2021 GRP if it’s behind a parapet as they can hold snow as well as water and ice and snow are more damaging. You can get a decent fall on it (1:40) and it won’t have any issues for decades. 1 Link to comment Share on other sites More sharing options...
Ferdinand Posted January 11, 2021 Share Posted January 11, 2021 3 hours ago, SteamyTea said: A bit of creative designing and I am sure that drainage areas could be built in with GRP. But I always think of Nigel Pargetter's scream. Pargetting, of course, can be applied to parapet walls. Even if the pattern is a row of fingernail trails leading to the edge. Link to comment Share on other sites More sharing options...
tonyshouse Posted January 11, 2021 Share Posted January 11, 2021 Re parapet walls, they leak, they drag heat out of buildings, are not fail safe, cause the problems you mention. Link to comment Share on other sites More sharing options...
Makeitstop Posted January 12, 2021 Author Share Posted January 12, 2021 Is this something you've had direct experience of to tonyshouse, or do your views come from some professional capacity? 1 Link to comment Share on other sites More sharing options...
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