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External insulation or windows first

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  • 31-10-2012 2:06pm
    #1
    SemperFidelis
    Registered Users Posts: 266 ✭✭


    Hi,

    I've bought a cavity block house with single glaze windows and no insulation at all. After reading through boards I believe external insulation is the only option for this type of house. I plan to also get some good double glaze windows too.

    So my question is from the point of view of the finishing which should I get done first, external wall insulation or double glaze windows. Both will have an impact on the finish around the windows/sills so I'm wondering is there a preferred order.

    Thanks


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    #2
    Melendez
    Closed Accounts Posts: 1,645 ✭✭✭Melendez


    This post has been deleted.


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    #3
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    Windows first most definitely .

    They will be losing heat on a per m2 basis , about 3 times faster than the walls are. ( Approx wall U value will be 1.7w/m2K , window approx 5.1 W/m2K).

    Assuming windows equate to 25% of wall area you get by way of simplified example ( wall area being 100m2 , windows being 25m2)

    100 x 1.7 = 170w/k loss through walls
    25 x 5.1 = 127.5 w/k loss through windows.

    Despite the smaller area , the rate of heat loss through the windows almost evens the score. Furthermore the heat you lose through single glazing is very sensible by that I mean physically sensible - the human body really feels it. The low surface temperature of the single glazing seems to suck the heat from you.


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    #4
    SemperFidelis
    Registered Users Posts: 266 ✭✭SemperFidelis


    Many thanks for the replies,

    I'll try get both done together but unless I get a great quote for the insulation it'll likely be windows first then.


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