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Can I do the interior of the house first, and only after a couple of years to do the insulation of the facade?

House of expanded clay concrete blocks 40cm, plastered on the inside, in the rain the walls inside are wet! Because of financial constraints, the foreman proposes to plaster the walls from the outside and primer and do interior decoration (go inside the house), and in a year or two to insulate the house and apply decorative trim. Can I do this? I'm afraid that in a year or two the interior finish will be ruined.

• expanded clay concrete