Conflicting Advice - Bottom of kneewalls

Discussion in 'Builders' Talk' started by Stuart Armstrong, Dec 18, 2017.

  1. Stuart Armstrong

    Stuart Armstrong New Member

    Wonder if anyone can given me some advice?

    I'm wanting to increase the insulation in my current property. 2 different companies have provided 2 different answers in relation to the purple areas. One said don't block, the other said these need to be blocked.

    Blue = Current
    Red = Planned

    Anyone able to provide a third opinion.


    Attached Files:

    Last edited: Dec 18, 2017
  2. KIAB

    KIAB Super Member

    I would block, are the sloping ceiling upstair insulated?
  3. Stuart Armstrong

    Stuart Armstrong New Member

    No , I would love to get them done but its almost impossible to retro fit.
  4. KIAB

    KIAB Super Member

    Shame, your biggest source of heat lost.

    Overboard with insulated plasterboard.
    Last edited: Dec 18, 2017
  5. Stuart Armstrong

    Stuart Armstrong New Member

    Would you be concerned about moisture if you block the purple areas?
    The slopes are just too large to get boards up them. I could try and cut the boards and push them up but would have no way of joining them or ensuring they are efficient.
    Without taking the ceilings down I'm stuck with them.
  6. KIAB

    KIAB Super Member


    You have air flow up sides & over the top so should be ok, if unblocked then cold air would make ceiling & room below cold.

    Shame no insulation between floor joists in attic.
    Last edited: Dec 18, 2017
  7. Stuart Armstrong

    Stuart Armstrong New Member

    Very cold!!!!! plus current insulation is about 100mm squashed to about 30mm. Urgent work to be done
  8. stevie22

    stevie22 Screwfix Select

    I would block. I would also put some Celotex over the slopey bits if there's nothing there: even 25mm would make a huge difference thermally and not affect the room size overmuch.
    KIAB likes this.

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