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Cavity wall insulation on extension's 'internal wall'

  • 29-11-2021 11:15am
    Registered Users Posts: 3,335 ✭✭✭ 10-10-20

    In a situation where an single storey extension is built onto a house with pre-existing 100mm cavity with 50mm PIR insulation in the adjoining wall, how is the insulation and condensation runoff normally remediated to prevent a cold wall and associated problems?

    Is it common to have the wall partially pumped, or is vermiculite used to backfill the void?

    The reason I ask is that I have a cold wall on my extension and I'm trying to work our my options to remedy it.