SteamyTea Posted March 14 Share Posted March 14 2 minutes ago, Gone West said: To get around the problem of damp when installing GRP on a roof is it feasible to use GRP sheets bonded to the substrate Yes, I have been saying that for years on here. The joints will need to be treated when it is dry, but as they can be done in a very short space of time, and the joint can be made near enough rain proof with a PU adhesive during installation, it is not much of a problem. One advantage of sheathing a substrate is that it is done in a workshop, where there is less problems with weather, the UV in sunlight can cause the exposed surface to cure faster than what is next to the substrate, this can cause problems with under curing. Another really big advantage is that it is easy to sheath different substrates i.e. thin ply, thicker OSB, foam sheets. If you want to get really posh, different surface finishes can be incorporated i.e. non slip, arty patterns, fake tiles. I really do think that GRP is an underused material, but I think most of that comes from the industry 'doing it on the cheap' and as an afterthought/panic measure, rather than incorporating it at the design stage. 2 Link to comment Share on other sites More sharing options...
Gone West Posted March 14 Share Posted March 14 What thickness sheet would you use on a roof and how flexible is it, for example for sliding up under the main roof when installing on an extension. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 14 Share Posted March 14 Just now, Gone West said: What thickness sheet would you use on a roof and how flexible is it, for example for sliding up under the main roof when installing on an extension. Not sure I understand the second part. This may be a topic for a new thread. Link to comment Share on other sites More sharing options...
Gone West Posted March 14 Share Posted March 14 2 minutes ago, SteamyTea said: Not sure I understand the second part. This may be a topic for a new thread. OK, thanks, I'll do that. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 14 Share Posted March 14 1 minute ago, Gone West said: OK, thanks, I'll do that. I am going out as it is Comic Day, but shall look for it when I get free. 1 Link to comment Share on other sites More sharing options...
Guest28 Posted March 14 Share Posted March 14 Video of a 5 year old GRP roof. Roofers love flat roofs because they get so much work repairing them. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 14 Share Posted March 14 38 minutes ago, MBT6 said: Video of a 5 year old GRP roof A perfect example badly done GRP. I think that it has been cut up and sections then just replaced and a flowcoat added over them. So not really representative of GRP. Link to comment Share on other sites More sharing options...
joe90 Posted March 14 Share Posted March 14 9 minutes ago, SteamyTea said: So not really representative of GRP. I agree, I have done GRP roofing, it’s not hard to get right. Link to comment Share on other sites More sharing options...
Iceverge Posted March 14 Share Posted March 14 2 hours ago, joe90 said: I agree, I have done GRP roofing, it’s not hard to get right. A common mistake by smart people is to underestimate the available depths of stupidity and incompetence. When it comes to making something as idiot proof as possible I agree with @MBT6 a well pitched roof, with good overhangs and no valleys, covered in slate or tiles is one of the hardest to really screw up. 1 Link to comment Share on other sites More sharing options...
joe90 Posted March 14 Share Posted March 14 13 minutes ago, Iceverge said: A common mistake by smart people is to underestimate the available depths of stupidity and incompetence. Oh yes, you can’t cure stupid….. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 14 Share Posted March 14 26 minutes ago, Iceverge said: A common mistake by smart people is to underestimate the available depths of stupidity and incompetence. I am not so sure, but maybe because for the last 16 years I have been in hospitality and have to often deal with customers who cannot string a sentence together, and then don't listen to the words 'we don't serve that' I have met real stupid people, and drunk, stones, angry, violent, hungry, famous ones at that. Prior to that I was lecturing and had to deal with young (and not so young) students that knew (expletive deleted)ing everything (social science students where the worse). Could take ages to teach them to unlearn what they knew, and then let them relearn a different 'model' that was more appropriate. Similar to here with some people. That is not a criticism, just that building physics is not always simple and intuitive. Why I like to break the problems down to the smallest relevant parts, and then rebuild in a more appropriate order, and put recognised units on each part. "I Think You'll Find It's a Bit More Complicated Than That" is a good starting point. Link to comment Share on other sites More sharing options...
Iceverge Posted March 14 Share Posted March 14 The design has some perks. The footprint of both floors match. No "magic" bits being held by either giant thermal bridges or sorcery. Theres good grouping of the wet rooms for drainage and short water runs etc. It's a sensible size at 160m2. Personally I'd avoid the flat roof if for nothing more than leaf clearance duties and there really should be an accessible shower downstairs. I'd think the huge window will cause some overheating issues too. Other than that it's fine. Link to comment Share on other sites More sharing options...
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