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CH_18

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  1. Just about to purchase either VCL or a Vapour barrier (polythene). Anymore thought on this before I order? If I'm foil taping anyway shall I just stick some polythene up instead of a controlling layer?
  2. It will be Welsh Water. I understand the concerns with a building/extension but is a non load bearing wall allowable?
  3. Hi all, Just coming round to doing our drive and entrance on our new build and would like to build an entrance wall over a main sewer, is this allowed? It's not really a permanent structure and could be knocked down easily if it was required. I've read the building over sewer guide but it only mentions houses/buildings/extensions not boundary walls? Thanks
  4. FYI the last pic is not of my issue but someone with similar problem. Is the general consensus that cracking on insulating and installing VCL will hopefully sort the issue out?
  5. Ah interesting, have you got GSE in roof system? And does it only happen in the wet weather? Have you just cracked on and insulated hoping it will solve the issue?
  6. Cheers Marvin Yeah that's my thinking also, although like I said I have insulated 5 rafters and it made no difference behind these. So I may have unless to do the whole roof to fully test the theory. I have had the sand/cement screed poured in January but this was happening before and after that?
  7. Hi mate, no never, it was -5 degrees here the other week and I had no patches whatsoever, bone dry. This is what's dumbfounding me, I'm no physics expert, but I would have thought condensation would be affected by temperature and not weather? So unless it's purely the relative humidity outside that's increasing in the wet weather like Mike said is resulting in the ideal conditions for condensation to come closer and show up I don't know?
  8. I think this might be my next plan of attack. I have got the borescope available so will still be able to see behind the insulation. Either that or I was thinking about cutting a piece of membrane out directly behind a panel to see what exactly is going on? Not sure on this idea mind because the membrane is what's keeping the water out ATM. If I was to cut some out any decent tips to seal a new piece in afterwards?
  9. I've had two solar installers round mate to have a look and they are as dumbfounded as me? They say the install is fine, they mentioned the EPDM washers had exploded from using an impact gun so I replaced all of them and torqued them up? Apart from that they were also head scratching 🤦
  10. Thanks Mike, that's helpful So that would explain why condensation only occurs when it's wet weather, rain/damp/mist/drizzle. I insulated one side of the roof and left the panel side uninsulated so I can see what's going on. This might be compounding the issue possibly. I have tried insulating between 5 rafters just to test but the patches still appeared behind, maybe I need to crack on and insulate the whole roof for a proper test? What do you think?
  11. Hi Mike, yeah been through them guides and videos 236 times looking for answers. Can't seem to find anything, changed all the EPDM washers thinking it may have been them, but no improvement. I'm 95% sure it's condensation but don't understand the science behind why we're getting it. Massive amounts of air flow, house still being built so no heat on, although no insulation on that side of the roof yet. Spoke to GSE they were of little help, they're only focus was on the small holes in the membrane.
  12. Can anyone offer any advice? Still battling with this. It's definitely not leaking. I've had a multiple water hoses running full whack on the roof at 1m intervals and the patches didn't appear, bone dry. I did however get a borescope through the membrane to where the patches were showing and noticed drips coming from the back of the GSE tray and onto the membrane, which seems like a condensation issue. This is a new build, ventilation at eaves and ridge, breathable membrane but no insulation has been installed yet to monitor the issue. I have since insulated between 5 of the rafters as a test to see if the patches disappeared, but they came back next time we had damp weather. Again, patches only show, at a continuous height all the way across the panels and in wet weather, I'm out of ideas.
  13. Ok thanks for the advice What about in the ceiling between joists? I suppose because the insulation is laying flate it doesn't need the structural properties of the acoustic stuff so is normal loft/mineral roll on here? Looking to put in 150mm.
  14. Yeah looks like a decent middle of the road option, nearly half the price of RWA 45. Where did you get yours from @Chanmenie?
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