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    • CommentTime7 days ago
    Ah, it's not a case of needing to use gypsum mortar. Firstly the fleece on the tape isn't the primary air seal, the adhesive is, so the normal procedure in many cases is to apply the plaster of whatever type and let it go off, then apply the tape to the junction. If more plaster is applied over the top, it doesn't need a perfect bond to the fleece because it isn't the airtightness seal. Using Contega PV though the seal is made to the plaster as it is applied through the mesh and there the tendency of gypsum to expand as it sets is useful, because it closes up the joint. But it works perfectly well with lime (and cement so far as I know) as long as there is some fibre and something to help the bond in the mix.

    We've got more cracking in our gypsum plaster than in our lime. Not in the middle of areas but at wall junctions and the like, just due to movement of the house. I presume that is because the gypsum is more brittle and also because it is applied thinner.
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