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Dormer windows

  • 15-02-2009 7:01pm
    #1
    mcm09
    Closed Accounts Posts: 10 ✭


    I am assessing my first room in roof property. When you specify a room in roof in DEAP under building elements roofs tab it auto generates a roof area for you. However if there roof windows than they should be taken from this area.

    My question is about dormer windows. Should they be taken from the roof area too. I would presume not as the room in roof is meant to flatten everything and the roof over the dormer would more or less fill the void of the opening ..

    Can anyone confirm.


Comments

  • #2
    dunie001
    Registered Users, Registered Users 2 Posts: 179 ✭✭dunie001


    AS FAR AS I'M AWARE...The auto calculation doesn't allow you to make any deductions to the area because it works it out from the Dimensions tab using a formula that can be found in the DEAP manual.

    I usually just add in the windows into the windows tab as normal, ignoring the fact that it's a dormer window and just measuring the window size in the same way as any other window. Please correct me if i'm wrong.

    Also presuming that you're doing the assessment on an existing house, you should use all the default values that DEAP give, including the windows. i.e. Double and triple glazing should be selected as being air-filled with no Low-E coatings unless substantial proof can be obtained to proof otherwise...

    SOMEONE PLEASE ANSWER THIS:
    Q. Do you include the gable walls of a "room in roof" in the walls section, as I presume that they are not accounted for in the roof section?????


  • #3
    dahayeser
    Registered Users, Registered Users 2 Posts: 156 ✭✭dahayeser


    dunie001 wrote: »
    AS FAR AS I'M AWARE...The auto calculation doesn't allow you to make any deductions to the area because it works it out from the Dimensions tab using a formula that can be found in the DEAP manual.

    I usually just add in the windows into the windows tab as normal, ignoring the fact that it's a dormer window and just measuring the window size in the same way as any other window. Please correct me if i'm wrong.

    Also presuming that you're doing the assessment on an existing house, you should use all the default values that DEAP give, including the windows. i.e. Double and triple glazing should be selected as being air-filled with no Low-E coatings unless substantial proof can be obtained to proof otherwise...

    I would agree with this. The figure is auto calculated and I don't think you should be subtracting dormers of roof windows from the auto calculated figure.

    Again just my opinion, open to correction if anyone has SEI confirmation.

    dunie001 wrote: »
    Q. Do you include the gable walls of a "room in roof" in the walls section, as I presume that they are not accounted for in the roof section?????

    Yes correct. I confirmed this with a trainer. The gable walls are not included in the 'room in roof' - roof calculation and must be included under walls in building elements.


  • #4
    dunie001
    Registered Users, Registered Users 2 Posts: 179 ✭✭dunie001


    Yes correct. I confirmed this with a trainer. The gable walls are not included in the 'room in roof' - roof calculation and must be included under walls in building elements.

    Thanks for the clarification...I was 99% certain about it anyway, but just wanted second opinion to be sure to be sure!!!:D

    The reason I was wondering is actually because most old houses had their gable walls built with blocks on their flat with no insulation...but had dry-lining added internally later to compensate, which meant I had to adjust the U-value to suit and add in seperate to the main walls of the house...which I was kind of hoping I could avoid doing, but no such luck!;)

    Luckily, things have progressed since the 80's and builders now put in 300mm cavity insulated wall on the gable regardless if it's a dormer or bungalow....which is great!:)


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