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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.

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    • CommentAuthorbiggerbyfar
    • CommentTimeMar 31st 2018 edited
    I have some experience with Pavadry from Pavatex for internal solid wall insulation but I'm looking at other options.

    Has anyone here had experience that they could share with Unger Diffutherm UdiReco or UdiIN Reco systems, or the Pavadry system? Pavadry requires dry-lining with plasterboard and gypsum skim whereas UdiReco is a direct plasterable surface.

    Having boarded a room with pavadry I have found a few issues - there doesn't seem to be any anchors compatible that are thermally broken. I also found it difficult to get the boards level. The UdiIN Reco appeals because (I believe) it doesn't require a levelling base coat as it has a mouldable fibre backing that can flatten out any bumps. Also the front board comes with countersunk mounts so that thermally broken anchors can be used. I haven't double checked but it also seems that I could go back to the brick and save a bit of lost space from adding the insulation. One of the biggest tasks with my pavadry project was reinstating the lime base coat, which I wished I'd never hacked off. I had no idea of the amount of materials involved, and couldn't find anyone to do it, so did it myself :cry:

    Any thoughts about any of these systems appreciated.
    I have used udiReco externally, and found it great to use, apart from the size of the boards being a bit much for my feeble frame!
    I have used a lot of Pavadentro. Yes, the lime is slow, but I like the system. Pavadry does not appeal. I did recently use Pavadentro, air-tight membrane, battens and plasterboard, but if we hadn't needed the 'extra air-tightness' and the service void, I would have left out the (gypsum) plasterboard.

    Agree re the fixings. All I was offered were stonking great big (?stainless?) steel fixings.
    I used Mungo MQL-ST 8x160mm frame fixings.
    • CommentTimeApr 1st 2018 edited
    biggerbyfar said: "I used Mungo MQL-ST 8x160mm frame fixings."

    Looking at https://www.mungo.swiss/en/products/qr/mql-universal-nylon-frame-plug.html I see there is a "MQL-STr Universal Nylon Frame Plug with screw T30/T40, stainless steel A4/316" whilst the ST is described as "MQL-ST Universal Nylon Frame Plug with screw T30/T40". I presume that means that the ST is NOT stainless, in which case it is presumably BZP or similar treated mild steel and as such has a poor (large) thermal conductivity.

    So, best to avoid all metal screws in the first place, but if you must choose metal then use stainless steel in insulation. I'm not sure why PH Store advertise the STs for anchoring Pavadry. I'd have thought the STr were better suited.

    I see Mungo do make fixings specifically intended for use with insulation: https://www.mungo.swiss/en/products/qr/insulation-fixings.html
    The issue with using the normal insulation fixings is that they require a countersink for the big flat plastic head, at least I think they do. Because they would stand pround of the pavadry board face they’re deemed unsuitable.

    This is part of the reason for querying here. I can’t help think that pavadry is an adaption of something else and wasn’t conceived for the purpose of IWI with a plasterboard front. This contrasts with the UdiReco and UdiIN Reco which are countersink for these heads.
    • CommentAuthordelprado
    • CommentTimeApr 1st 2018
    I will write properly when I am near a computer but there are loads ofnthermally broken fixings. I’ve used the stars here when using some pavadentro into mymasonry but I plan to use udi for reason I will mention later

    • CommentTimeApr 1st 2018
    Posted By: biggerbyfarThe issue with using the normal insulation fixings is that they require a countersink for the big flat plastic head, at least I think they do. Because they would stand pround of the pavadry board face they’re deemed unsuitable.

    I must confess I don't understand what the purpose of the hardboard layer is on the Pavadry. Does anybody? I could understand if it was intended as the finished surface, or as the base for something like wallpaper, but I don't see the advantage of something like hardboard under plasterboard?
    • CommentAuthordelprado
    • CommentTimeApr 2nd 2018
    I think it’s to get a strong fixing for the fermacell whichbisnobicously very heavy,
    Pavadry essentially avoids the need to lime plaster the finish by providing a MDF-like face to screw standard plasterboard to. I found it impossible to engage any plasterers into lime plaster with any ‘system’ so ended up with the pavadry route.
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