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Where to put insulation?

  • 02-06-2016 11:16am
    #1
    Damokc
    Registered Users, Registered Users 2 Posts: 1,432 ✭✭✭


    Hey guys, just wondering where exactly we should put the insulation in our build? Do the walls upstairs running the length of the house really need it if its running down the whole length of the rafters into the eaves anyway? Would it be a waste as it would be doubling it up for no extra advantage? Also any advice on insulation type?


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,170 ✭✭✭✭sydthebeat


    Damokc wrote: »
    Hey guys, just wondering where exactly we should put the insulation in our build? Do the walls upstairs running the length of the house really need it if its running down the whole length of the rafters into the eaves anyway? Would it be a waste as it would be doubling it up for no extra advantage? Also any advice on insulation type?

    is this a new house build?


  • #3
    Damokc
    Registered Users, Registered Users 2 Posts: 1,432 ✭✭✭Damokc


    It's an unfinished house we bought. Upstairs is studded out and 1st fixings of plumbing and wiring are in.


  • #4
    sydthebeat
    Subscribers Posts: 42,170 ✭✭✭✭sydthebeat


    Damokc wrote: »
    It's an unfinished house we bought. Upstairs is studded out and 1st fixings of plumbing and wiring are in.

    assuming it was appropriately "substantially complete" when yo bought it.... the standard of insulation is dependent on the buildling regulations applicable at the time of construction. Also, theres a good chance air tightness is something you will need to consider.

    you need professional assistance with this.


  • #5
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,339 Mod ✭✭✭✭Gumbo


    Damokc wrote: »
    Hey guys, just wondering where exactly we should put the insulation in our build? Do the walls upstairs running the length of the house really need it if its running down the whole length of the rafters into the eaves anyway? Would it be a waste as it would be doubling it up for no extra advantage? Also any advice on insulation type?

    Where's your thermal envelope and air tightness envelope located.
    Who is completing your BER assessment and issuing final BER cert on completion?


  • #6
    Damokc
    Registered Users, Registered Users 2 Posts: 1,432 ✭✭✭Damokc


    sydthebeat wrote: »
    assuming it was appropriately "substantially complete" when yo bought it.... the standard of insulation is dependent on the buildling regulations applicable at the time of construction. Also, theres a good chance air tightness is something you will need to consider.

    you need professional assistance with this.

    The image I attached is a rough section of the house. All I want to know is where to place the rolls of insulation.

    Would the below image be correct? The area on the left will be a void space.

    I was under the impression that BERs were only needed if the house was to be sold or rented?


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  • #7
    sydthebeat
    Subscribers Posts: 42,170 ✭✭✭✭sydthebeat


    Damokc wrote: »
    The image I attached is a rough section of the house. All I want to know is where to place the rolls of insulation.

    Would the below image be correct? The area on the left will be a void space.

    I was under the impression that BERs were only needed if the house was to be sold or rented?

    no your under the wrong impression there... but regardless

    even though youve bought a substantially complete house, you STILL need to comply with building regulations to finish it.

    you need a professional to tell you:
    1. what type of insulation you need (may need a preliminary DEAP report, commonly called a prelim BER report)
    2. what thickness of said insulation
    3. where and how to install it
    4. how this affects your air tightness
    5. where and how to deal with air tightness
    6. sign off the whole lot on completion


  • #8
    Damokc
    Registered Users, Registered Users 2 Posts: 1,432 ✭✭✭Damokc


    OK, thanks for that.


  • #9
    Water John
    Registered Users, Registered Users 2 Posts: 21,808 ✭✭✭✭Water John


    Syd is right. I think the way you have the ins on the RHS is the way to go, but would also ins vertical stud.


  • #10
    Metric Tensor
    Registered Users, Registered Users 2 Posts: 3,725 ✭✭✭Metric Tensor


    Both options are possible Damokc - and there are different reasons why you would pick each but without knowing more information about the house no-one can give you a proper recommendation as to which is best.

    To further complicate it you need different types of insulation depending on which approach you want to take.

    This decision will be heavily affected by how you plan to approach your air-tightness envelope. As others have pointed out there are a lot of building regulation requirements (including air-tightness) with which your house must comply.

    This is why everyone is recommending you engage a professional who sees this sort of thing every day and can show you how all the various items tie together to determine how much insulation of what type should be placed in what places.


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