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  1. O

    Both semis have new roofs, its still soaking! Help please

    Are there any pics inside the loft, above that damp wall? Trying to understand what part of the roof is above that wet patch. Is that V-shaped adjoining roof valley ending above it? Could there be condensation dripping down the underside of the that roof valley?
  2. O

    Damp joists in loft

    Hi there, been looking at this and have some more thoughts. Note, I'm not a roofer but a fellow sufferer of 'roof anxiety'. :) Just to explore the condensation idea fully before totally dismissing it.... Have you pulled back lagging from soffit vents to maximise ventilation? You said it...
  3. O

    Damp joists in loft

    No harm in improving insulation regardless, if nothing else it rules out that as cause.
  4. O

    roof ventilation using breathable membranes?

    For me the answer would be yes. I have recently had an extension built on my house, with membrane. No vents. Lots of mould and condensation had built up within 1 year.
  5. O

    Plastic roof channels/valleys - condensation issue

    Yep that's what I'm realising. Really annoyed about it. Being practical I can't rip it up and put membrane under it now. I can only try and protect it internally from condensation and hope to God the plastic lasts a few good years. I'll just have to get it replaced (with membrane) before any...
  6. O

    Grp valley

    OK so I realise this post is ancient (2014) but is my same exact problem I have today ! Plastic roof valley exposed underside in loft, condensation all over it. No membrane covering it. No amount of ventilation helps - it's a 3mm bit of plastic with cold air outside and slightly less cold...
  7. O

    Roof valley with exposed underside - help

    OK so I think my roof has been botched. My roof valley is made of plastic and is totally exposed on the underside, fully visible in loft space. No felt or membrane under it. The exposed plastic is prone to bad condensation which then contacts the woodwork and soaks in -- a worry for weakened...
  8. O

    Damp in loft despite breathable membrane (Ed.)

    OK. Given my current situation - the plastic roof valley is exposed, I can't un-expose it, but I can cover/insulate the underside of the roof valley to stop the warmer air condensing on it. (I've had some luck wiht this on one section, using SuperFoil bubble wrap). Plus I need the usual...
  9. O

    Damp in loft despite breathable membrane (Ed.)

    Presumably it would also protect the wood beams from the condensation.
  10. O

    Infuriating leak

    Wow, what an epic situation you had, well done on the self-diagnosing and experimenting with smoke etc. It sounds certain that your new flue vent will sovle it.
  11. O

    Damp in loft despite breathable membrane (Ed.)

    Thanks, I am more worried about the immediate risks from condensation seeping into woodwork, rather than future leaks in the valley. Although by the sound of it this job of replacement is best done before that happens.
  12. O

    Plastic roof channels/valleys - condensation issue

    I'm now starting to think the problem is that these aren't meant to be exposed, and there was an error in the build.
  13. O

    Damp in loft despite breathable membrane (Ed.)

    I hardly dare ask but how big a job might that be for a roofer to take up the valley and replace it with felt/membrane under it. Presumably it would entail lifting a load of tiles and replacing the battons either side too. Would this be an essential thing to do, in order to protect the woodwork?
  14. O

    Damp in loft despite breathable membrane (Ed.)

    Me too, my question would be is there any reason to NOT add vents when a so called breathable membrane is used. I'm going to add some lap vents to mine this week and see what happens.
  15. O

    Damp in loft despite breathable membrane (Ed.)

    It's just literally bare exposed plastic on both sides. That's all they did on the build. Isn't this a building regs thing?
  16. O

    Damp in loft despite breathable membrane (Ed.)

    And yet it passed all the building inspections... really worrying. I thought I could work around this by sticking superfoil insulation on the underside. Now I'm wondering if the whole valley needs ripping up and redoing with felt underneath.
  17. O

    Damp in loft despite breathable membrane (Ed.)

    Oh dear, I see the whole thing... here's a section
  18. O

    water on loft beam

    This is the endpoint of a roof beam beneath a plastic roof valley (the dark grey strip). You can see it appears to be soaked in water on its lower half. I believe the water is dripping off the plastic surface and soaking into the beam. (white membrane feels dry to touch). I'm confident this...
  19. O

    Damp in loft despite breathable membrane (Ed.)

    Thanks, it's clear the membrane isn't letting out the warmer air, because the worst condensation is on the roof valley on membrane side (new roof section). I have never noticed any condensation until this new roof section was added, possibly because i've never had any roof valleys before. I...
  20. O

    Damp in loft despite breathable membrane (Ed.)

    Thanks, I think the problem is the roof section in question is possibly only around 2m in width, so possibly if there's a join it could be right near the bottom where I can't see it. So if I want to fit lap vents my only option would be to cut slits to fit them. EDIT: Just had a closer look and...
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