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Dry lining stone wall - best detail

  • 21-08-2010 4:54pm
    #1
    Builderfromhell
    Registered Users, Registered Users 2 Posts: 1,570 ✭✭✭


    I have dry lined many stone cottages in the past and have used different methods on each as knowledge and experience suggested improvements could be made. I now have a project where my client has an external gable wall on the 1st floor which is damp. I have suggested removing the unused brick chimney to eliminate the main source of dampness. The exterior plaster is somewhat perished and I have suggested we re-plaster this with lime plasster if possible. To increase insulation I am thinking of

    1. 2"x2" battens on DPM
    2. 2" Kingspan insulation between battens
    3. Vapour control membrane (VCL)
    4. Plasterboard (not foil backed.

    My thinking is, if I use a Vapour barrier between the wall and the battens I could divert any moisture to ground floor wall.
    The above construction will allow wall to breath in both directions and mould growth is minimised.

    Cottage room sizes are tiny so I cannot use thicker structure.
    Would prefer not to use Kingspan as I believe it loses it's insulating qualities after 20 years and must be fitted without joints.

    Any views and opinions appreciated.


Comments

  • #2
    PaleRider
    Registered Users, Registered Users 2 Posts: 155 ✭✭PaleRider


    Hi, i don,t believe the method you describe will work best. You know that convection will state that the VCL will go on warm face of wall. You could use a VCL Insulation Plasterboard Board over the 2x2 it will only add an extra 20mm. The reason i don,t like, is that the risk of vapour getting to the VCL next the stone if i understand you correctly.
    1. I would make sure there is no risk of vapour reaching cold stone wall. Seal all joints on perimeter stud work, also any services in wall seal around. Allow no path for vapour.
    2. If you are leaving chimney exposed on the the outside, put on chimney cap to divert rain. Ventilate
    3. If concrete barge board repair, and seal.
    I hope i have understood what it is you were asking. I like your question and believe more needs to be understood in this area. Regards


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