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Fireproofing a stud wall

Discussion in 'Building Regulations and Planning Permission' started by DIYedboy, 5 Jun 2018.

  1. DIYedboy

    DIYedboy

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    I have robbed half of my garage to make a downstairs loo. I will screw up 15mm fireline plasterboard to this (on the garage side), does this also have to be plastered to comply? or if I use two layers of 12mm fireline plasterboard can I forget the need to plaster?
     
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  3. tony1851

    tony1851

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    According to the old 1965 Building Regs, 1/2" (12.5mm) plasterboard (unplastered) both sides will give 30 mins fire resistance.
     
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  4. Nakajo

    Nakajo

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    Fires ain't what they used to be.
     
  5. ^woody^

    ^woody^

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    Does all the damp weaken the paper?
     
  6. oldbutnotdead

    oldbutnotdead

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    In a previous role, 2 x 12.5mm plasterboard (not skimmed, not fancy fireline, just vanilla ordinary board) were deemed sufficient fire separation between understage and stage. For preserving life, that'll do (gives you plenty of time to get out and leave the job to Fireman Sam). For preserving property (if you're bothered) maybe you'd need a bit more, 3mm of skim isn't going to make much difference.
    Worth having some smoke and heat alarms around the place as well (heat in the garage, smoke in the loo as well as the standard downstairs and upstairs landings) to give additional warning.
    Also consider a fire door between loo and house (to maintain the original house-garage separation)
     
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  7. ^woody^

    ^woody^

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    It stops early flame over of the paper backing
     
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  9. DIYedboy

    DIYedboy

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    The garage is on the side of the house (1930's), nothing is above the garage, in building regs terms should the fire protection for this stud wall be 30min or 60min?
     
  10. tony1851

    tony1851

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    30 minutes.
     
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  11. tony1851

    tony1851

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    Is spread-of-flame relevant to a small garage or small wc?
     
  12. ^woody^

    ^woody^

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    Passive fire protection should be a combination of several items working together not individually. The OP may be OK with a sheet of 15mm ply to give him enough time, or just not calling it a "garage" but I don't think that's the point.
     
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  13. DIYedboy

    DIYedboy

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    Here's the thing, the brick built garage that was built to house the Austin 7 is now only 16 feet by 3 feet (albeit still with an up n over door). So I suppose it could be reclassified to a 'storage area'...................does that mean we are talking one sheet of pink 12mm (30mins), one 15mm sheet (60mins) or two sheets of 12mm(60++mins)?
     
  14. ^woody^

    ^woody^

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    Juan Sheet is plenty ..... 12.5mm each side of the partition and if there are no joints. Otherwise two sheets on the garage side.

    No need to skim fireline board but it depends on the manufacturers tests. Normally skim not needed but joints taped and filled to their guidance.

    Any joints covered by studs, noggins or plasterboard strips within the frame

    Intumescent mastic to wall edge junctions.

    If using two sheets on one side, you will get the same 30mins performance from normal 12.5 or even 9.5mm plasterboard for this situation.
     
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