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CancerCakes posted:Sounds positive anyway, good job. Are you going fully flat roof or monopitch? The latter, I think.
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Apr 9, 2021 18:01
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What options do we have for flat roofs these days? Assuming not 90s tar style, it's what, rubber, fibreglass, anything else?
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Apr 10, 2021 14:47
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I think most will do epdm on OSB or similar. We don't really get felt tiles like in the us, but considering the horror stories in the construction thread that is for the best. I suppose you *could* slate it but the expense and extra weight is up to you. I came across this site, seems pretty good for insulation: https://www.secondsandco.co.uk/kingspanshop
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Apr 10, 2021 16:18
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Jaded Burnout posted:What options do we have for flat roofs these days? Assuming not 90s tar style, it's what, rubber, fibreglass, anything else? On residential side of things you now see SIPs and green roofs.
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Apr 10, 2021 16:25
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CancerCakes posted:I think most will do epdm on OSB or similar. We don't really get felt tiles like in the us, but considering the horror stories in the construction thread that is for the best. I suppose you *could* slate it but the expense and extra weight is up to you. Noted, thanks. iv46vi posted:On residential side of things you now see SIPs and green roofs. I was just looking at green roofs. It looks like they're relatively affordable to buy as kits, but in any case they go on top of a normal waterproofing system, but it would e.g. mean that an EPDM roof would be more puncture resistant. They are heavy, though, like 75kg/sqm, so it would require some really beefy joists, like 3x8s at 400mm centers (for the 5m open span I have to cover). So, maybe a £200 price difference in materials to support the weight. Not too bad.
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Apr 10, 2021 16:58
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EPDM is king for ease/time of install, there are companies offering 50 year warranties on their thicker products. It's pretty trivial to patch damage (with the correct materials/glues). I don't know enough about green roofs to offer anything other than the opinion "I think they're nice"
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Apr 11, 2021 07:37
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I've done some research and I'm going for EPDM. The builder preferred fibreglass because it's less of a pain to flash in the skylights, and I agree with him on that, but fibreglass is a real dick to work with *after* it's installed, which matters more to me (see previous adventures in skylights). So I'm going to tell him I'll build and install the upstands and install the skylights (with lifting help this time) and that should remove a hassle point on his side (and I get to make sure it's done right first time this time).
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Apr 11, 2021 07:52
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Jaded Burnout posted:They are heavy, though, like 75kg/sqm, so it would require some really beefy joists, like 3x8s at 400mm centers (for the 5m open span I have to cover). This can’t be right can it, how thick does the soil / substrate need to be? I wouldn’t expect even a foot deep sq metre of compost to weigh 75kg.
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Apr 11, 2021 10:40
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wooger posted:This can’t be right can it, how thick does the soil / substrate need to be? I think it's the water as much as anything. https://www.ansgroupglobal.com/green-roof/technical/my-building-strong-enough-green-roof
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Apr 11, 2021 10:57
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The volume of a foot deep, square meter cube is about 300L, so 75kg feels on the low side for that much material. If it was solely water it'd weigh around 300kg.
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Apr 11, 2021 11:11
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Yeah I can't speak to the density of compost, but I know damp soil is real heavy. Here's my latest comms to the builder, I'll probably get on to the nitty gritty later today. JB over email posted:I'm going to have to take some measurements to come back with a really accurate spec, but the summary is we're going to stick with the original plan up to the finished floor level, then stick build above that. I've gone over the engineer's calculations and it's not safe to have heavy machinery on normal timber floors; the usual planned load is 0.75kN/sqm, and we need to support more like 5kN/sqm (which the block & beam supports).
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Apr 11, 2021 11:18
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lol the insulation I had priced up like a year ago at 30quid a sheet is now £100! kill me
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Apr 12, 2021 11:31
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I'm concerned enough about pushing the edge of pre-defined span tables etc that I'm going to have the structural engineer take another pass at the new design. I need to redraw a bunch of the elevations in at least a basic way, and checking the openings, piers etc are still safe is beyond my ability, but I'm comfortable enough that we'll fit everything in, and the SEng can do the rest. 
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Apr 16, 2021 11:49
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New sketch (with copious notes) sent to the engineer.
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Apr 17, 2021 19:14
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I'm glad you labelled the concrete also do you have beam and block floor beams inside the wall? I think that isnt how it would be. save on a couple of beams be like one of these: 
NotJustANumber99 fucked around with this message at 20:55 on Apr 17, 2021 |
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Apr 17, 2021 20:46
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NotJustANumber99 posted:I'm glad you labelled the concrete Everything gets a label. No ambiguity. Ambiguity leads to misunderstanding. Misunderstanding leads to me having to redo something in a year. NotJustANumber99 posted:also do you have beam and block floor beams inside the wall? I think that isnt how it would be. save on a couple of beams I was following the engineer's drawings: 
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Apr 17, 2021 22:03
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