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Insulating Ceiling Cavaties

  • 08-04-2009 7:51am
    #1
    bauderline
    Registered Users, Registered Users 2 Posts: 899 ✭✭✭


    Someone mentioned to me recently about pumping the basement and ground floor ceiling cavaties. Both floors are precast....

    Is this a useful exercise at all ?

    P.


Comments

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


    what cavities?

    have you suspended ceilings?

    what heating system have you? rads?


  • #3
    bauderline
    Registered Users, Registered Users 2 Posts: 899 ✭✭✭bauderline


    Instead of battons I used the gypsum system which is laser levelled etc. I am speaking about the void between the plasterboard in the ceiling and the bottom of the precast floor of the room above. House is all UFH.

    P.


  • #4
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    bauderline wrote: »
    Instead of battons I used the gypsum system which is laser levelled etc. I am speaking about the void between the plasterboard in the ceiling and the bottom of the precast floor of the room above. House is all UFH.

    P.

    if your house is UFH, surely you have insulation under the UFH on top of the slabs...

    if so i dont see the need to pump the cavity... the insulation should be reflecting the UFH upwards into the screed

    also there is a real possiblity of fire risks involved as this is a service cavity, electrical wires etc....


  • #5
    bauderline
    Registered Users, Registered Users 2 Posts: 899 ✭✭✭bauderline


    Yes... UFH insulated with 100mm Polyiso ...

    Was thinking of heat escaping through the plasterboard ceiling and being absorbed by the prescast...

    I guess services runs could be placed in ducting...

    P.


  • #6
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    bauderline wrote: »
    Yes... UFH insulated with 100mm Polyiso ...

    Was thinking of heat escaping through the plasterboard ceiling and being absorbed by the prescast...

    I guess services runs could be placed in ducting...

    P.

    the idea of low energy houses is to make the envelope as air tight and as insulated as possible. Then you should use the internal mass as a thermal store,the reason being if you reduce your heat loss as much as possible, then it shouldnt take you much energy to keep topping up your space heating... the whole internal atmosphere of the dwelling should be regulated.. this is of course assuming you will use the whole dwelling on a daily basis.


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