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U values for windows-Rationel

  • 19-04-2008 2:01pm
    #1
    shakeydude
    Registered Users, Registered Users 2 Posts: 207 ✭✭


    Hi,

    I was looking at rationel windows and the U value for the glass is in the region of 1.2 W/Sqm K. I thought that they be able to comply to the Passive Standardss of 0.8 W/Sqm K. Am I missing something here, or do the rationel windows have to be treated further to achieve the necessary rating. If you look at Tomas O leary's passive home in Wicklow he would seem to have rationel. Any help is appreciated.

    Shakeydude


Comments

  • #2
    holdfast
    Registered Users, Registered Users 2 Posts: 1,152 ✭✭✭holdfast


    the glass may be 1.2 but you need to inlcude the frame and thsi maqy increased the overall u value. you can get what every glass you want but what the passive house design allows up to do is increase the insulation of the walls etc. to achevie the overall max spacing heation of 15kw/m2 per year. but in most cases triple glazing with is the standard.


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


    google SEI passive house suppliers

    you will find very high performing window suppliers there ( 0.7 )

    expect to pay + 50 to 60 % over windows at u value 1.1


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