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Airtightness of plaster

  • 05-03-2019 10:44PM
    #1
    porrige
    Registered Users, Registered Users 2 Posts: 38 ✭


    Hi,

    Can anyone provide a reference to best practice for achieving airtightness with wet plaster on internal masonry walls ?

    Does plaster skim on ceiling plasterboard offer any airtightness ?
    Any research to back up answers would also be appreciated.

    Thank you.
    Tagged:


Comments

  • #2
    MicktheMan
    Registered Users, Registered Users 2 Posts: 2,952 ✭✭✭MicktheMan


    Why are you airtightening an internal wall?


  • #3
    porrige
    Registered Users, Registered Users 2 Posts: 38 ✭porrige


    MicktheMan wrote: »
    Why are you airtightening an internal wall?

    :-) internal/room side of external walls


  • #4
    Lumen
    Registered Users, Registered Users 2 Posts: 30,505 ✭✭✭✭Lumen


    Gyproc do a couple of specific air tightness products with stated values for permeability at 6mm thickness, so I'm guessing that a 2mm skim of regular plaster won't cut it.

    http://www.gyproc.ie/sites/default/files/Section%201.8%20-%20Airtightness%20Plaster.pdf

    Surprisingly difficult to find research. Maybe that's because best practice is to achieve air tightness with membranes before plasterboard goes on. Otherwise how would a failed blower door test be rectified?


  • #5
    B-D-P--
    Registered Users, Registered Users 2 Posts: 1,162 ✭✭✭B-D-P--


    Short story, it's a bad option.
    You'll have air holes anywhere you have a switch or light. These are more important than you think


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