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Not using L blocks on the reveals of Doors and Windows

  • 10-04-2018 10:40am
    #1
    Shauny2010
    Closed Accounts Posts: 657 ✭✭✭


    Can I get away without using L blocks at window and door opes. It will be a CavityTherm 125mm insulated concrete block cavity wall.
    I'm thinking that I can let the insulation board run out to the edge face as it is going to be covered up afterwards with a slab.
    It would mean that I would have to use longer straps on the windows to fix them but would their be any other issues?


Comments

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


    What does your arch, Eng and window supplier have to say?

    What does your construction detail show?


  • #3
    Victor
    Registered Users, Registered Users 2 Posts: 78,580 ✭✭✭✭Victor


    What happens when there is a fire that enters the cavity and the whole building collapses?


  • #4
    Shauny2010
    Closed Accounts Posts: 657 ✭✭✭Shauny2010


    BryanF wrote: »
    What does your arch, Eng and window supplier have to say?

    What does your construction detail show?
    No construction detail given, only at pre planning stage at the moment
    Victor wrote: »
    What happens when there is a fire that enters the cavity and the whole building collapses?

    How would a fire enter the cavity, It would be double slabbed at the revel so if fire can cross through an inch of slab then every timber framed house in the country is screwed


  • #5
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    Victor wrote: »
    What happens when there is a fire that enters the cavity and the whole building collapses?

    L blocks arent there for fire proofing.

    They were originally introduced to provide a ground for windows / doors screwed into the middle of a cavity wall. Nowadays, these can be strapped back to inner or outer leafs so L blocks arent widely use any more.

    Theres no problem with Full fill insulation at these junctions.


  • #6
    ht9zni1gs28crp
    Closed Accounts Posts: 1,011 ✭✭✭ht9zni1gs28crp


    Victor wrote: »
    What happens when there is a fire that enters the cavity and the whole building collapses?

    Given this statement I would guess you arent au fait with Technical Guidance Document B and its latest iterations?

    But technically speaking on your statement, if a fire gets into a cavity, thats not contained and spreads with intensity to collapse a building I fear the fire itself is the least of your worries construction wise :D

    Also in standard domestic construction, the time taken for total building collapse v egress time would make this a moot point.


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