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New build insulation

  • 10-01-2017 11:11pm
    #1
    KingPuck01
    Registered Users Posts: 46 ✭


    Hi all,
    I'm currently at the subfloor level of a new bulid. 2 story 2900 sq ft. Air to water heating. I'm torn over building in 110mm quinntherm insul board or pumping the 150mm cavity at the end. All suggestions would be appreciated.


Comments

  • #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 39,940 Mod ✭✭✭✭Gumbo


    KingPuck01 wrote: »
    Hi all,
    I'm currently at the subfloor level of a new bulid. 2 story 2900 sq ft. Air to water heating. I'm torn over building in 110mm quinntherm insul board or pumping the 150mm cavity at the end. All suggestions would be appreciated.

    What has your BER Report called for?
    Have you discussed it with your BER Assessor to see what the differences V cost will achieve?
    Have you discussed it with your builder to see if it impacts on programme and costs to you?


  • #3
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,640 ✭✭✭✭Calahonda52


    KingPuck01 wrote: »
    Hi all,
    I'm currently at the subfloor level of a new bulid. 2 story 2900 sq ft. Air to water heating. I'm torn over building in 110mm quinntherm insul board or pumping the 150mm cavity at the end. All suggestions would be appreciated.

    Or OP: why bother with any?

    “I can’t pay my staff or mortgage with instagram likes”.



  • #4
    Metric Tensor
    Registered Users, Registered Users 2 Posts: 3,725 ✭✭✭Metric Tensor


    Not a huge difference between the u-value of the two options listed as far as I know (assuming platinum bonded bead) so to give the benefit of the doubt to the OP he may be discussing both with his designer.

    The only thing is that I think the Part L compliance might be tough with either. I think they might both skirt around the backstop value.

    Assuming your BER/DEAP assessor can make the calculations work with either of these options OP then:

    Pumped bead:
    Quick
    Easier for blocklayers
    In theory should be continuous - i.e. no gaps. (Big emphasis on "in theory")

    Slab:
    Maintains cavity - (definite weather proofing benefits, possible thermal looping dowsides)
    Extra work for blocklayers but possibly forces them to be tidier
    Joints in insulation.

    There's no right answer.


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