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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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    • CommentAuthorShevek
    • CommentTimeOct 29th 2021 edited
    I've specified Solitex Plus to the roof of a timber frame project I'm working on, on the basis of its reputation as one of the best membranes, due to its monolithic active membrane technology and high tear strength.

    I'm keen to get this specification right because we're using a direct-on-sarking/insulation-between-rafters build up (with acceptable WUFI assessment already done) and I want to ensure that OSB sarking layer is protected.

    The QS on this project wants to look at cheaper options. Happy to do this but what are the metrics to focus on?
    • CommentAuthorShevek
    • CommentTimeOct 29th 2021 edited
    Pro Clima market Solitex Plus as actively transporting vapour (i.e. absorption, diffusion, release ) rather than passively (as microporous membranes do), but what is the metric that measures the speed of this process? How do you compare the speed of transfer with other membranes?
    • CommentAuthorShevek
    • CommentTimeNov 2nd 2021 edited
    For instance, how do I compare the vapour transfer performance of Roofshield (which is a meltblown core, not a microporous membrane) with Solitex Plus?

    They seem to perform very closely in terms of strength and vapour resistance but one difference seems to be that Roofshield is air permeable. Does this make it less useful as a windtightness barrier? Perhaps not given that we'll be laying it direct on OSB and the OSB is acting as a wind barrier.
    • CommentTimeNov 2nd 2021
    From my comparative experiments with WUFI, when I had access to it, extreme permeability isn't necessary - just OK is quite adequate. For example the very medium permeability of EPS, and the ditto and variable permeabilirty of OSB, work just fine in 'breathing' constructions. The way to look at it, is that such OK-isk permeability is still a million miles different from the near-zero permability of a vapour barrier like polythene, or other other plastic (aero bubbles) insulations - XPS, urethane etc
    • CommentAuthorShevek
    • CommentTimeNov 17th 2021
    What about air permeability vs air impermeable?

    If you compare Roofshield with Solitex Plus, Roofshield actually has more vapour permeability but it's also air permeable. How important is that factor in a timber frame building with membrane fully support on OSB roof deck for instance?

    Seems to me the wind-tightness of Solitex Plus would provide better thermal performance and better protection of the structure and decking because it stops wind-wash.
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