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Housing - Renovation: WUFI - IWI insulation 1960s house

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    I am still mulling over what IWI to use on my 1960s concrete block-cavity wall house (gable end wall - I cant do EWI on it). The wall is fake-stone-faced outside. The cavity is filled but is only 50mm.

    I am reluctant to use phenolic - I can't see how I can effectively vapour proof it and I also understand that with offgassing it shrinks by around 2%. I will be doing both up and downstairs and into the floor space between and want to get the installation done in October before the winter sets in.

    Another option I 'd like to explore is using one of the wood-fibre boards (pavatex/therm type stuff), 600mm. Could someone run a WUFI calc on this for me if they have a spare few mins?

    Haven't yet worked out the construction details but would probably use insulated fixings into the interior block and through the plaster, possibly studwork over on which to fix plasterboard or OSB. That would give a breathable insulation. The ventilation in my house is to be sorted out by humidistat/active ventilation in kitchen and bathroom (it has a condensation problem at present). I am going to use a heat recovery system for the bathroom via a unit in the loft (details not worked out yet).

    How breathable is plasterboard - is there anything new out there that isn't gypsum?

    Thanks.

    Sue
  2.  
    Additional info: the house is in Somerset. The gable end wall is south facing but in continuous shade as next door's house blanks it completely. That opposite gable end wall for next door is 6m away.
  3.  
    Sue,

    NBT will run a WUFI calc, I think. They certainly offered to for one of my clients. I imagine you mean 60, not 600mm, unless you have a very, very big house! :bigsmile:

    Natural Building Technologies: www.natural-building.co.uk/
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      CommentAuthorfostertom
    • CommentTimeSep 3rd 2012
     
    Are you sure you mean WUFI? - that's v advanced. Tho we shd be using it and learning what REALLY happens, 99.9% of such checking is still done by more simplistic Euler-diagram software such as BuildDesk.
    • CommentAuthorEd Davies
    • CommentTimeSep 3rd 2012
     
    • CommentAuthordjh
    • CommentTimeSep 4th 2012
     
    Posted By: suegreenbuildingHow breathable is plasterboard - is there anything new out there that isn't gypsum?

    There are lots of boards that aren't gypsum :bigsmile: For example, you can get clayboards (made of clay for internal walls, not the foam type you use to protect foundations)

    But if you're using Pavatex or similar, you don't need any board, just plaster it direct.
  7.  
    Magnesium Oxide? Not as green as clayboard right enough, but technically very impressive stuff.
  8.  
    yes I meant 60mm
  9.  
    yes I meant 60mm

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