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Plastering under insulated board

  • 01-10-2012 4:44pm
    #1
    about2build
    Registered Users, Registered Users 2 Posts: 166 ✭✭


    Guys quick one here....have received advice that I should plaster behind the drylining board on external walls...a thin coat applied to boost airtightness. I am hoping to achieve a q50 of less than 1.5 so what do ye think, excessive or worthwhile?


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    about2build wrote: »
    Guys quick one here....have received advice that I should plaster behind the drylining board on external walls...a thin coat applied to boost airtightness. I am hoping to achieve a q50 of less than 1.5 so what do ye think, excessive or worthwhile?

    absolute necessity if you want to reach those figures. Do you realise how porous a concrete block is?

    its very questionable why you are going with insulated boards in the first place, but that ship has sailed.

    Id aim for a 8-10 mm coating of sand and cement render.


  • #3
    about2build
    Registered Users, Registered Users 2 Posts: 166 ✭✭about2build


    Ya i thought as much....plasterers telling me that the skim coat on top of the plaster boards would do the job but I questioned that and was looking for confirmation here. As for use of insulated board- I am pumping a 150mm cavity (already done) and placing a 50 mm board on the inside as well. Looked at going for 200 or 250 mm cavity but decided against it. thanks for reply syd


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