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EWI questions

  • 19-03-2018 3:29pm
    #1
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭


    Hi,

    We're looking at externally insulating our (mostly) cavity wall '60s bungalow but I've a couple of things I'd like to understand better before I get some installers out for quotes.

    1. We have an extension built at right angles to the original house. The extension was built eight years ago so has rigid insulation in the cavity. The original house has an empty cavity apart from one end of it which appears to be solid wall. Our front door is beside where the extension meets the original house and its much too tight to fit EWI at that point. I've attached a photo. The pebbledash area is the new extension, the door reveal is the original house. Is there any way around this or is it going to be an ongoing weak point?

    2. I'm thinking of pumped bead insulation for the cavity walls. Does it make sense to get the extension walls that have rigid cavity insulation already pumped as well?

    3. Our gable ends only have 12cm overhang. The rest of the house has overhangs ranging from 22 to 20 cm depending on whether its the original house or the new extension. What's the minimum overhang that I'd need to be looking for after EWI has been fitted? I've seen some houses with verge trims fitted over EWI which doesn't look like a good long term solution. Has anyone heard of installers in Ireland who'll extend the roof itself?

    4. Is it worth getting the existing windows moved out into the insulated area or is that again likely to be an issue for installers?


Comments

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


    1. There is a solution
    2. Yes subject to suitability
    3. Ewi gable /overlap of roof insulation and wall insulation is just a detail to be solved
    4. Yes. It’s only an issue if people aren’t clear on the details


  • #3
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭H.E. Pennypacker


    BryanF wrote: »
    1. There is a solution

    Thanks - can you give me some idea of possible solutions? I've had two EWI installers out in the past and both of them said that it'd just have to be left as is.


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


    H.E. Pennypacker wrote: »
    Thanks -
    1. can you give me some idea of possible solutions?

    2. I've had two EWI installers out in the past and both of them said that it'd just have to be left as is.
    1. An arch tech or architect would be best placed to visit, survey & detail out each situation/junction.
    2. What did they suggest should be left as is?

    Can we focus on the worst situation or just one question?

    Thanks


  • #5
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭H.E. Pennypacker


    BryanF wrote: »
    1. An arch tech or architect would be best placed to visit, survey & detail out each situation/junction.
    2. What did they suggest should be left as is?

    Can we focus on the worst situation or just one question?

    Thanks

    Hi,

    I meant the first point which is the biggest issue I think. The installers reckoned that as there was less than 100mm between the door reveal and the wall of the extension that the EWI could not be run up to the reveal but would have to be finished off leaving an uninsulated gap up to the reveal. We'd just have to live with it.....

    A solution doesn't seem obvious to me so I'd be very interested in knowing what is possible before I get another installer out to quote.


  • #6
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Option A
    Aerogel @ 100/m2 (10mm thick) you’ll use it sparingly. But you could fix ~30mm thick at the door. This can be meshed/ rendered & blended into the rest of the ewi.

    B
    another option, could be to bring out the door into the ewi, assuming you’d do the extension in ewi - this might give you a little more space on the opening side.

    C
    Expose end of lintel, check with engineer, prop lintel, cut back concrete enlarging ope, replace with longer lintel, move out door, ewi


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  • #7
    H.E. Pennypacker
    Closed Accounts Posts: 844 ✭✭✭H.E. Pennypacker


    BryanF wrote: »
    Option A
    Aerogel @ 100/m2 (10mm thick) you’ll use it sparingly. But you could fix ~30mm thick at the door. This can be meshed/ rendered & blended into the rest of the ewi.

    B
    another option, could be to bring out the door into the ewi, assuming you’d do the extension in ewi - this might give you a little more space on the opening side.

    C
    Expose end of lintel, check with engineer, prop lintel, cut back concrete enlarging ope, replace with longer lintel, move out door, ewi

    Perfect - thanks :-)


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