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Housing - Renovation: External Wall insulation on a cavity wall

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      CommentAuthordjh
    • CommentTimeSep 19th 2020
     
    Posted By: Peter_in_Hungary
    Posted By: bxmanWhat I do know is that If you have the ability to have the roof adequately cover the EWI and can minimise and successfully seal all intrusions through the EWI there should be no penetration of air or water in any of it's forms through the EWI.

    +1

    Of course, if you believe in breathable construction, you probably don't want that. You want a water vapour-open path to outside at least, and maybe to inside as well.
  2.  
    Posted By: djhOf course, if you believe in breathable construction, you probably don't want that. You want a water vapour-open path to outside at least, and maybe to inside as well.

    EPS EWI is (a bit) breathable but won't take up water so IMO fits the bill nicely for EWI in an exposed situation.
    •  
      CommentAuthordjh
    • CommentTimeSep 19th 2020
     
    Posted By: Peter_in_HungaryEPS EWI is (a bit) breathable but won't take up water so IMO fits the bill nicely for EWI in an exposed situation.

    Depends on the render as well.
    • CommentAuthorJeff B
    • CommentTimeSep 19th 2020
     
    Thorvaia wrote: Hi, my internal walls (well the internal walls on the external walls if that makes sense), consists of a 1inch stud, with 10mm of polystyrene sheet then the plaster board...thats it.....

    OK thanks for the explanation. So what you have is a rudimentary IWI system then. In our dormer bungalow I have put 75mm of Celotex against the dwarf walls and the gable end walls. 50mm sheets held in place with 50 x 25mm sawn timber battens screwed through into the walls and a further 25mm placed between the battens (friction fit and taped over with aluminium tape). Then foil backed plasterboard secured to the battens with the usual black phosphated screws.

    It has made a huge difference - we do not need to have the radiators on upstairs any more as the heat rising from the living rooms below does the job.

    I am contemplating doing the same on the two lounge walls which are external facing, but probably not until next year as/when funds permit!
    • CommentAuthorrevor
    • CommentTimeSep 20th 2020
     
    BXMAN
    "My entire energy import for the year in a 3 bed semi is less than 1000 kWh with the aid of 7.5 kW of PV panels and a 20kW battery."

    If I may hijack this thread for a moment what is the inverter (presume it is hybrid) and battery you have specified.
    • CommentAuthorbxman
    • CommentTimeSep 21st 2020 edited
     
    @revor

    Hi

    Sofar ME3000

    Crucial feature is that apart from a seldom used electric shower all hot water comes from a number of 2kW electric kettles

    The PV panels are coupled to Aurora inverters and a I2 Solar Diverter boils the water or a number of Night storage heaters in the darker months
    • CommentAuthorrevor
    • CommentTimeSep 22nd 2020 edited
     
    thanks bxman. So what is the battery I am looking at a 6kWp system and 10kW battery
    • CommentAuthorbxman
    • CommentTimeSep 22nd 2020
     
    hi
    @revor

    I have got 4 s/h growatts coupled to it . It has been on line since the end of Jan 2019 and they cope quite well as far as I can see.
    At the moment the Sofar is showing 52 battery cycles in that time .
    So I am hoping that it has not put to much strain on them

    Being on my own I do make sure I only have one appliance on at the same time.

    I have imported 62 units since the end of February this year and 1221 since Jan 2019 that being 24.8% of the Load in that period .
    I do not know how much of that was used to charge the batteries possibly 350 if anyone can think of a way to record that I would like to try and do so out if interest.
    •  
      CommentAuthordjh
    • CommentTimeSep 25th 2020
     
    To go back to the original topic ...

    Just come across a link here where a house had rockwool cavity insulation that became saturated, had that removed and replaced with EPS beads and then EWI added. Has been fine since it was done ten years ago apparently.

    https://passivhausrefurb.blogspot.com/search/label/cavity%20walls

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