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Concrete grade for strip foundations

  • 30-11-2007 9:32pm
    #1
    sas
    Registered Users, Registered Users 2 Posts: 1,282 ✭✭✭


    Just a quick one, assuming good ground conditions whats the usual grade (or whatever the measurement in newtons is called) for concrete in strip foundations for regular cavity wall house i.e 3 foot wide and 1 foot deep incorporating a single layer of A393 mesh?


Comments

  • #2
    Jimbo
    Closed Accounts Posts: 2,379 ✭✭✭Jimbo


    30-35N generally AFAIK


  • #3
    sas
    Registered Users, Registered Users 2 Posts: 1,282 ✭✭✭sas


    jimbo78 wrote: »
    30-35N generally AFAIK

    Grand, thanks. Was curious as the homebond book lists 20n if I'm reading the table correctly and I thought 25n was the norm.


  • #4
    blue diver
    Closed Accounts Posts: 35 ✭blue diver


    25n is the nor 30 35 is finer gravel used for foot pats and finer finis


  • #5
    godtabh
    Moderators, Science, Health & Environment Moderators Posts: 23,243 Mod ✭✭✭✭godtabh


    Doesnt also depend on ground conditions etc?

    There is a table or wheel chart that you can get from the Irish Concrete Society that goes through the different mixes for different conditions


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