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Insulating Skyight duct

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  • 26-01-2009 7:13pm
    #1
    Carawaystick
    Registered Users Posts: 8,779 ✭✭✭


    I've a velux skylight in the en suite toilet - there's a box of foil backed plasterboard from the ceiling up to the window - about 8' high or so; tapering from 4'x3' at the ceiling to about 3'x2' at the window.
    While I was in the attic at other stuff, I noticed the fibreglass insulation had slumped down about 9" or so from the top nearest the skylight, letting most of the heat escape into the attic space.

    i was wondering the best way to insulate this. I was thinking some rigid insulation board outside(in the attic) the existing plasterboard and re-wrap the fibreglass around this.
    I don't know how to keep the fibreglass attached to the almost vertical duct without compressing it ether - I'm guessing this was a sloppy job by the builders.

    I'm also wondering about having rigid insulation right up to the felt underneath the tiles, should I leave a gap- wasting heat- of fit it as cose as possible to the roof?


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    #2
    RKQ
    Registered Users Posts: 2,292 ✭✭✭RKQ


    You could install foil faced insulation board - kingspan, xtratherm etc, then overlay fibre glass and hold it in place with nylon builders string or plastic netting (from Garden centre)

    Bring insulation right up to felt around velux - no gaps!

    Do you really need to install insulation board?
    Fibre glass might be enough - especially if theres no gaps and you increase thickness to 250mm.


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