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Windows and external insulation advice please

  • 02-03-2013 8:01pm
    #1
    jamboambo1
    Registered Users, Registered Users 2 Posts: 89 ✭✭


    We are looking at retro fitting our house . The plan was to do external insulation and change all the old windows at a later date.
    Insulation people advise doing windows first and then insulation. They said better to get windows moved out so they are flush with existing walls and then do insulation

    Does this add greatly to cost of windows?
    I spoke to a window company today who said they advised against moving windows forward as we would get dampness in. Not sure I trusted the salesman to be honest but any advice would be appreciated before I go to get more window quotes. Not sure who to listen to.


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    jamboambo1 wrote: »
    We are looking at retro fitting our house . The plan was to do external insulation and change all the old windows at a later date.
    Insulation people advise doing windows first and then insulation. They said better to get windows moved out so they are flush with existing walls and then do insulation

    1. Does this add greatly to cost of windows?
    2. I spoke to a window company today who said they advised against moving windows forward as we would get dampness in.
    3. Not sure I trusted the salesman to be honest but any advice would be appreciated before I go to get more window quotes.
    4. Not sure who to listen to.
    1. There will be an additional cost by a builder and ideally arch tech to prepare the details of weathering , thermal, and air-tightness. I'm specifying this on an external insulation (ewi) and win retro fit at the moment.
    2. you should ask him the prepare a detail giving a 0.01w/mk thermal bridge( psi value), 0 air leakage and weather proofed fully with the ewi system. ( very quickly you'll realise many salesmen are just that- salesmen..) dampness will not be a problem if window is detailed correctly. Spending x on wins And y on ewi and not overlapping correctly to get their full benefit is mental..
    3/4. Get a an arch tech to detail the wins with thermal bridging & air-tightness experience. Win and insulation companys often only deal with their components and wont be a great help outside of that.
    Some wins companies in order to stay up on the passive house trends have as part of seeking ph certification prepared details of this. MJ is one, I'm sure there are others ( in saying that the win sales guy I'm currently dealing with frim them is slow and poor on the technical detail)


  • #3
    jamboambo1
    Registered Users, Registered Users 2 Posts: 89 ✭✭jamboambo1


    Thanks for the info. This is all new to me and we weren't planning on using an architect. As always cost is the issue
    What is an arch tech? should we be employing someone to coordinate the two?
    I hadn't heard of MJ before? are they window supplier. Can you give me their details


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    jamboambo1 wrote: »
    Thanks for the info. This is all new to me and we weren't planning on using an architect. As always cost is the issue
    1. What is an arch tech?
    2. should we be employing someone to coordinate the two?
    3. I hadn't heard of MJ before? are they window supplier. Can you give me their details

    1. arch tech
    2. i have no idea what your house type is, or your budget is. if its a terrace and your total spend after grants is 7-10g then its hard to reason an arch's fee. but if its 1500sqft house and the cost of ewi & wins is say 40g then say 2% for professional input is perhaps not a huge outlay
    3. Munster joinery: they sell windows, (not window integrated external insulation systems). there are plenty of other good window companies in Ireland (& i have no affiliation with any of them)


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