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full fill cavity board

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Comments

  • #32
    Carbonnet
    Registered Users, Registered Users 2 Posts: 66 ✭✭Carbonnet


    BryanF wrote: »
    please excuse me, my Y's & Ψ's are very confused!

    lets stick with eaves detail and work through that

    we have an 1.2 R-value for the eaves thats 'acceptable' (1/R = u-value of 0.8wm2k), we then have a u-value of say 0.15wm2k general u-value for a cavity walls which the OP was interested in

    so the 'acceptable' eaves junction u-value is 5 times worse than wall u-value, causing a potential cold bridge, leading to mould patches along the wall plate in your new house built to the 'acceptable' details, though the building complies with building regs as the total linear thermal bridges added-up equal to a great Y-factor/value

    You MUST model the detail to work out the PSI value.
    If you don't model - use the acceptable details and use the PSI from IP1/06 (not R value?????) in your calculation to determine the Y value.

    You CANNOT determine the possibility of condensation/mould from an R-value - it must be modeled in 3D to determine the f factor to demonstrate surface temp factor is better than 0.75

    or use the Acceptable details which have been modeled and both PSI and F factor determined to prove their suitability.


  • #33
    iankell1984
    Registered Users, Registered Users 2 Posts: 9 ✭iankell1984


    Hi Manself,
    I built my house with the 150mm fullfill xtratherm recently. My lad was building 2 courses on the inner leaf first and cleaning the mortar snots as he was going, then putting in the boards and putting the outside courses after as far as i saw after work. The corner pieces are preshaped for the corners and are much better job than cutting and butting the pieces. My blockie hadnt used the xtratherm before and didnt know what to make of it until the rep dropped out when the stuff was delivered. Once he got going with it he was very impressed and the other blockies though it was a great job and handy to work with. Tell the lads to keep a brush to sweep out the dried mortar snots and bits of dust on each layer of insulation as it rises stops gaps and ensures the joints sit in well.


  • #34
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    iankell1984 wrote: »
    Hi Manself,
    I built my house with the 150mm fullfill xtratherm recently. My lad was building 2 courses on the inner leaf first and cleaning the mortar snots as he was going, then putting in the boards and putting the outside courses after as far as i saw after work. The corner pieces are preshaped for the corners and are much better job than cutting and butting the pieces. My blockie hadnt used the xtratherm before and didnt know what to make of it until the rep dropped out when the stuff was delivered. Once he got going with it he was very impressed and the other blockies though it was a great job and handy to work with. Tell the lads to keep a brush to sweep out the dried mortar snots and bits of dust on each layer of insulation as it rises stops gaps and ensures the joints sit in well.

    As we have all said - attention to detail is important and not the product itself


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