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30 min fire resistance

  • 12-06-2008 11:41am
    #1
    paulmallon
    Registered Users, Registered Users 2 Posts: 104 ✭✭


    whats 30 min fire resistance for a steel beam supporting my sunroom roof?


Comments

  • #2
    topcatcbr
    Registered Users, Registered Users 2 Posts: 1,477 ✭✭✭topcatcbr


    paulmallon wrote: »
    whats 30 min fire resistance for a steel beam supporting my sunroom roof?


    Im unsure as to what your question is

    30min fire resistance for a steel supporting beam = the length of time that beam will resist a fire before becoming structurally weakened.


    I suspect however what you meant to ask is how to protect a steel beam to give it a 30 min fire rating

    this may be done by lining the beam in 12.5mm firegrade plasterboard.

    P411 Homebond manual 4th edition


  • #3
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    May i ask why you would require a steel beam holding up a roof to have prescribed fire resistance?

    may steel lintels on their own would have 1 hr fire resistances....


  • #4
    topcatcbr
    Registered Users, Registered Users 2 Posts: 1,477 ✭✭✭topcatcbr


    sydthebeat wrote: »
    May i ask why you would require a steel beam holding up a roof to have prescribed fire resistance?

    may steel lintels on their own would have 1 hr fire resistances....

    If the beam is below the ceiling it requires protection to a min of 30 min.


  • #5
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    as yes, i was picturing it as an external steel lintel type framework.

    basically OP, is this an internal beam appearing under your roof structure?

    as topcatcbr says, 12.5 fireboard.... or perhaps intumescent paint, if you want to expose the beam


  • #6
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    topcatcbr wrote: »
    Im unsure as to what your question is

    30min fire resistance for a steel supporting beam = the length of time that beam will resist a fire before becoming structurally weakened.


    I suspect however what you meant to ask is how to protect a steel beam to give it a 30 min fire rating

    this may be done by lining the beam in 12.5mm firegrade plasterboard.

    P411 Homebond manual 4th edition
    In addition note on pg 411 that the FRPB is fixed to a galvoed lightweight steel support structure and not just to timber 'hilti-ed' onto the steel beam as is often the case


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  • #7
    topcatcbr
    Registered Users, Registered Users 2 Posts: 1,477 ✭✭✭topcatcbr


    ircoha wrote: »
    In addition note on pg 411 that the FRPB is fixed to a galvoed lightweight steel support structure and not just to timber 'hilti-ed' onto the steel beam as is often the case

    It only shows a suggestion on how to achieve this

    I dont see a problem with it being fixed to timber hilti-ed to the steel if it is properly secured. the lining is providing the resistance not the galvoed lightweight steel support structure.


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