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Windows - Choices based on U-Values?

  • 17-08-2010 5:39pm
    #1
    prfeen
    Registered Users, Registered Users 2 Posts: 6 ✭


    I am trying to decided on what windows to install.

    I have standard 100mm block outer leaf, 60 mm xtratherm cavity insulation, and a 100mm inner leaf, I plan on drylining the inside also, which should give me a U-value circa 0.2 to 0.3 (assuming my calcs are ok)


    I have a quote for 15K approx for 75mm frame with double glazing -Window U-value 1.6

    The same company is offering 90mm insulation filled frame double glazed Window U-Value 1.2

    Any help, thoughts, observations etc.

    Thanks in Advance
    Mark


Comments

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


    we'll say nothing about your calculations because a difference of 0.1 in a u value of a wall is huge!!

    which window you go for depends on the difference in price... i would argue if theres less than 20% between the 1.6 and the 1.2 id go for it....

    15K sounds quite steep for a 1.6 u value.... it must be a high quality timber window...


  • #3
    prfeen
    Registered Users, Registered Users 2 Posts: 6 ✭prfeen


    sydthebeat wrote: »
    we'll say nothing about your calculations because a difference of 0.1 in a u value of a wall is huge!!

    which window you go for depends on the difference in price... i would argue if theres less than 20% between the 1.6 and the 1.2 id go for it....

    15K sounds quite steep for a 1.6 u value.... it must be a high quality timber window...

    heh heh, rough guess from the top of my head :-)

    15k covers about 24 windows and 4 doors and a sunroom

    the cost of the 1.2 is 20K


  • #4
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    If you have a BER assessor prepare DEAP calcs now you can answer all sorts of queries like this .

    You would get back an answer in energy / cost terms the performance comparisons between the two windows . And be better then able to decide , for instance , on +5k for windows ... or maybe install HRV


  • #5
    prfeen
    Registered Users, Registered Users 2 Posts: 6 ✭prfeen


    sinnerboy wrote: »
    If you have a BER assessor prepare DEAP calcs now you can answer all sorts of queries like this .

    You would get back an answer in energy / cost terms the performance comparisons between the two windows . And be better then able to decide , for instance , on +5k for windows ... or maybe install HRV

    Cheers


  • #6
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    Posts relating specifically to costs were moved here.

    Please , in this thread , stick to the topic in the thread title .


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