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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthordelprado
    • CommentTimeMar 8th 2018
     
    I cannot believe there is no thread about this product. Is it the magic answer it appears to be, especially for loft insulation in a retrofit context
    •  
      CommentAuthorfostertom
    • CommentTimeMar 8th 2018
     
    Loads - Search for it!
    •  
      CommentAuthordjh
    • CommentTimeMar 9th 2018
     
    Posted By: delpradoI cannot believe there is no thread about this product

    There are seven, counting this one, that have the word in the title, so how did you determine there are none?
    • CommentAuthordelprado
    • CommentTimeMar 9th 2018
     
    Turns out I was not spelling it right....

    Although now I've found them they are too old. Can I, basically, rely on it as a technology? It almost looks to good to be true!
    • CommentAuthorborpin
    • CommentTimeMar 9th 2018
     
    I used it in my new build. I agree I think it is a great product but equally, it is not a silver bullet so you need to do careful analysis of how it might affect the overall fabric especially in a retrofit.

    Age of treads is irrelevant; product does not change.
    • CommentAuthordelprado
    • CommentTimeMar 9th 2018
     
    Upon whom can you rely to give an honest opinion of risks and issues?
    •  
      CommentAuthordjh
    • CommentTimeMar 10th 2018
     
    Posted By: delpradoUpon whom can you rely to give an honest opinion of risks and issues?

    Wrong question. Honest opinions are not necessarily correct. Independent test results, a free press, and the passage of time, maybe?
    • CommentAuthorgravelld
    • CommentTimeMar 10th 2018
     
    In what sense do you view it as "too good to be true"?
    • CommentAuthordelprado
    • CommentTimeMar 11th 2018
     
    Because installation is shockingly fast, it fills every gap and can be pushed up against membranes (which warmcel is not allowed to do as its pushing material onto which leads to sagging, whereas this is just letting it expand on the surface), synthetic but breathable, air tight, no capilliary, extremely good sound attenuation, vapor permeable. There is nothing that can do all that and therefore I am suspicous that it is not used everywhere as nothing seems to come close
    •  
      CommentAuthorfostertom
    • CommentTimeMar 11th 2018
     
    Can you re-state the bit in (brackets)? Not sure what it means, but it seems the only thing the Warmcel doesn't also do. If breatheability is valued, why have membrane anyway?

    Things Warmcel does that Icynene doesn't:
    it's recycled/non synthetic (apart from its chemical additives) tho it's true part of Icynene's raw material is vegetable not petrochemical.
    it's hygroscopic.

    As I see it, the two are remarkably similar in effect tho so different in character - but Warmcel trumps Icynene for the last two reasons.
    • CommentAuthorgravelld
    • CommentTimeMar 12th 2018
     
    Posted By: delpradoBecause installation is shockingly fast, it fills every gap and can be pushed up against membranes (which warmcel is not allowed to do as its pushing material onto which leads to sagging, whereas this is just letting it expand on the surface)
    Are you sure about this? I think it might be situation dependent. I know of cases where it is installed into a frame, then cut to size, THEN boarded over, which is a lot more work. See https://forum.buildhub.org.uk/blogs/entry/85-icynene-insulation/
    • CommentAuthordelprado
    • CommentTimeMar 12th 2018
     
    Warmcel installer will tell you they can't moderate the blown nature of it, as such, and only normally stop when they see it is full, but once you have seen its full, its already pushing too hard against membranes and causes sagging and stretching where it shouldnt be
    • CommentAuthorgravelld
    • CommentTimeMar 13th 2018
     
    Didn't realise people installed it behind membranes... framing though, yes, which doesn't sag.
    • CommentAuthordelprado
    • CommentTimeMar 15th 2018
     
    Hi all

    I am now considering just using lcynene across loft joists, and therefore keeping it as a cold roof. THen laying wood fibre on top of it.

    I know there are certain things to think about when mixing insulation types, but I think this will work as the lycene becomes a useful air tight layer from rooms downstairs and not having to rely solely on plaster, then the wood fibre is hydroscopic enough to buffer any humidity issues as water potentially condenses as it rises upwards. (NB. the roof is natural slate, with Roofsheild (air breathable) membrane
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