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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorrevor
    • CommentTimeFeb 18th 2020
     
    I am puzzled as to why UB need to be protected in the event of fire by either Intumescent paint or fire rated plasterboard whereas standard steel lintels can have 1 hr fire rating with 12 mm plasterboard and skim finish.

    Anyone know why?
    • CommentAuthorIan1961
    • CommentTimeFeb 18th 2020
     
    There's no difference to the way that fire protection works with a standard steel lintel or a larger UB so maybe someone has given you some incorrect advice. If anything, larger steel sections are sometimes easier to protect as thicker steel heats up slower than the thin stuff they make lintels from.
    • CommentAuthorCWatters
    • CommentTimeFeb 19th 2020
     
    +1

    I think it's normal to require 30min fire protection for all steel beams in houses. Usually either two layers of regular plasterboard with staggered joints or one of fire resistant plasterboard.

    https://www.planningportal.co.uk/info/200130/common_projects/17/extensions/9


    Fire safety

    If the beam is steel then it should normally be protected against fire so that it will have 30 minutes resistance to fire (if measured in a standard test). There are different ways that this may be achieved, but the most common is the use of two or more layers of properly fixed plasterboard - the thickness of which will depend on the manufacturer's specification.



    Common method is to shot fire timber to the steel and screw plasterboard to that. Make the timber fitted to the web wider than the flange so the plasterboard on the underside can be screwed to it as well. Dont think builders adhesive is allowed.
    • CommentAuthorrevor
    • CommentTimeFeb 19th 2020
     
    This is from the lintel manufacturers data sheet. (I.G)

    FIRE PROTECTION OF LINTELS

    Recommendation to Meet 1 Hour Fire Requirement

     15mm LIGHTWEIGHT AGGREGATE METAL LATHING GRADE PLASTER

     15mm LIGHTWEIGHT “GYPSUM BROWNING”

     19mm SAND & GYPSUM BASE COAT WITH GYPSUM SKIM

     “THISTLE” HARD WALL (15mm) ONE COAT

     “THISTLE” UNIVERSAL (15mm) ONE COAT

     12mm PLASTERBOARD & DABS WITH GYPSUM SKIM

    Much less stringent than UB except of course an UB will more than likely be covering a much wider opening than a standard lintel.
    • CommentAuthorcjard
    • CommentTimeFeb 21st 2020
     
    Perhaps because a a steel lintel is only carrying a small part of the building whereas a UB/UC is more likely to be carrying a sizeable proportion of the building / risk of disproportionate collapse
    • CommentAuthorIan1961
    • CommentTimeFeb 21st 2020 edited
     
    <blockquote><cite>Posted By: revor</cite>This is from the lintel manufacturers data sheet. (I.G)

    FIRE PROTECTION OF LINTELS

    Recommendation to Meet 1 Hour Fire Requirement

     12mm PLASTERBOARD & DABS WITH GYPSUM SKIM

    I regularly carry out fire compliance inspections in buildings and I can promise you that 15mm of standard plasterboard & skim will only give 1/2 hour fire protection to steelwork. I'd ask the lintel manufacturer for the fire test data sheets to back up their claim. No Building Inspector would accept those quoted thicknesses of plaster without some kind of written fire test data.
    • CommentAuthorMike1
    • CommentTimeFeb 22nd 2020
     
    Posted By: Ian1961I'd ask the lintel manufacturer for the fire test data sheets to back up their claim.

    It should also be detailed in the Agrément Certificate. The reason could be because the approved method it details involves other other components - timber stud / blockwork infill, for example - not just the plasterboard.
    •  
      CommentAuthordjh
    • CommentTimeFeb 22nd 2020
     
    Posted By: Mike1It should also be detailed in the Agrément Certificate.

    The BBA cert just refers to the fire test data :)

    "Tested in fire conditions based on the method set out in BS EN 1363-1 : 2012, with the lintel protected by 12.5 mm plasterboard and skim coat (data available from Certificate holder, test report 380220, 09 August 2017)."
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