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Walltite - certification for masonry cavity retrofit

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Comments

  • #32
    10-10-20
    Registered Users, Registered Users 2, Paid Member Posts: 9,776 ✭✭✭10-10-20


    https://www.boards.ie/discussion/comment/121289780#Comment_121289780

    Agreed, galvanised was specified from early 80's in the UK at least I heard?

    So we're probably safe enough then with CV100 as long as we have the EPS/PIR board on the inner leaf.

    The other consideration that I had around CV100 was that it cures and expands better on warmer days - so I wanted to have the walls done when it was mild rather than a frosty day... small things like that.



  • #33
    Johntm
    Registered Users, Registered Users 2 Posts: 157 ✭✭Johntm


    Hi All,

    Would anyone have an update on this? Does anyone know can Walltite be used when availing of the SEAI cavity insulation grants.

    I believe the product has to be NSAI certified to avail of grant. I'm trying to get an answer from NSAI on this but they are slow to respond. I had heard that certification was given in the past few months but can't find any proof of this.

    Has anyone first hand experience with walltite and walls cracking?

    Thanks



  • #34
    Lumen
    Registered Users, Registered Users 2 Posts: 30,515 ✭✭✭✭Lumen


    https://www.boards.ie/discussion/comment/122678148#Comment_122678148

    Have you searched the certs on the SEAI website, or asked an installer?

    Regarding first hand experience, no, but I had an offline chat with a boardsie who had it done on a new build (IIRC) and had suffered cracking on internal plasterwork.

    A building surveyor who I spoke to recently reckoned it wouldn't be a problem on my house as the walls are almost 40 years old, but obvs that opinion is worth as much as I paid for it, which is nothing 😀

    Still haven't got around to getting it done though, too many other projects…



  • #35
    10-10-20
    Registered Users, Registered Users 2, Paid Member Posts: 9,776 ✭✭✭10-10-20


    https://www.boards.ie/discussion/comment/122678977#Comment_122678977

    a new build (IIRC) and had suffered cracking on internal plasterwork

    So internal leaf of a cavity wall. Was it localised or across all walls, can you tell us? And was there remediation beyond filler and paint required?



  • #36
    Lumen
    Registered Users, Registered Users 2 Posts: 30,515 ✭✭✭✭Lumen


    https://www.boards.ie/discussion/comment/122679012#Comment_122679012

    Yeah, movement of the internal leaf.

    I don't know how extensive but from what I dimly remember he said it was a pain in the arse to fix but he'd still do it again. Second-hand info so whatever that's worth.

    I'd expect any decent installer to be upfront in terms of risk assessing possible issues with cracking, but TBH I don't think I'd do it on a new build, when beads are properly certified and lower risk. There is some appeal of air tightness through the cavity in a retrofit, but a new build should be tested to meet air tightness requirements whatever approach is used, so why bother with a potentially problematic and uncertified approach?



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