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Windows

  • 17-08-2009 1:02pm
    #1
    macmonnie
    Closed Accounts Posts: 1 ✭


    As future self-builders we are currently working our way through detailed design following the grant of planning for the renovation of our existing cottage and new extension.

    One issue we are struggling with is our windows - and I'm hoping somebody might be able to offer us some advice.

    We will have large areas of glazing throughout the house (125sqm including 9sqm of rooflights). As the floor area of the house will be 252 sqm - in order to comply with Part L the windows would have to achieve a total u value of 1.14.

    Our dilema is this - we have two options as far as we can see...

    Get our windows from a supplier who can certify the u-value (can anyone recommend a supplier for triple glazed, outward opening timber windows??)

    or

    Reduce the amount of glazing by 20sqm so that we can demonstrate compliance with Part L (using DEAP.... which calculates the lowest u-value for an 'uncertified' triple glazed timber window at 1.3)

    In going for the second option this would allow us to source our windows from a family member who is in the industry saving us a fortune but would have a major impact on the design of the house. Is there anyway we can get around this?? We'd appreciate your help on this.


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    50% glazing seems very excessive, i hope you have large overhangs....

    why not use triple glazing (0.9 u value) on the colder sides (north / east) and off-set to come up with an average u value of 1.14.....

    triple glazing on south facing windows in anything other than a passive solar house is counter productive. Theres a high possibility that you will keep out more heat than you will keep in....


  • #3
    Quack13
    Registered Users, Registered Users 2 Posts: 111 ✭✭Quack13


    'Theres a high possibility that you will keep out more heat than you will keep in....'

    What do mean by a high possibility? What is the determining factor here?

    So you would recommend going triple glazed on north facing windows and double glazed on south facing?


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