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Preparation for Thermalite blockwork?

Discussion in 'Plastering and Rendering' started by Rhothgar, 8 Dec 2018.

  1. Rhothgar

    27 Oct 2018
    Thanks Received:
    United Kingdom
    I was chatting with a mate who retired from plastering 20 years ago, he reckons a really weak mix of PVA is required to limit suction.

    Trouble is he didn't say how weak or how many coats? He did say hit it with a 2nd stronger mix but didn't say how strong! Read horror stories on the forum about PVA peeling off! I would like to avoid any plaster ending up on the floor ideally!

    Also, how soon do you put the undercoat on after PVA'ing?

    This is probably a can of worms questions but would you use Dricoat or Hardwall for thermalite.

    I did think of lathing the whole wall with expamet but it's a big area, in a kitchen and I suppose liable to rusting eventually if I don't use stainless steel lath.

    By the way, it definitely Thermalite and I'm not just bandying the term about generically. It's as soft as baby's sh............. and as horrible as. :)
    Last edited: 8 Dec 2018

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