Jump to content
Ron

MF plasterboard ceiling - single sided

Recommended Posts

I have looked at the white guide and knauff guide at MF fire rated ceilings and there is lots of info.  However, I am trying to establish what fire resistance would be offered by a non fire rated 12.5mm plasterboard on a metal frame ceiling.  The MF is plasterboarded is on the lower side only and there is no risk in the void above.  I appreciate MF ceilings need various spacings for supports and hangers etc.  The plasterboard has no markings for manufacture.  Does anyone no where there is test data for such single sided  plaster boarded ceilings of any thickness (with 3mm skim).  Clearly it will be less than 30 minutes fire resistance but I am wondering if it would afford say 15 to 20 minutes which would allow time for persons to be evacuated from their bedrooms and adjoining corridor to a true FR30 compartment as a place of comparative safety.  A fire in the bedroom would need to spread through the single sided 12.5mm plasterboard MF ceiling, over the non full height partition to the corridor and pass through the corridor ceiling from the metal frame side to affect persons therein.  All ceiling penetrations would be FR30 rated.  Ideally the corridor should be a proper protected FR30 corridor but I am looking to see if I can find any information to make an informed calculation as to what fire resistance will be offered to the escape corridor.  From that point the Available Safe Escape Time can be gauged and from evidenced realistic fire scenarios an informed decision can be made as to whether the Required Safe Escape Time can be met (with a suitable safety margin).  Any pointers would be appreciated - I guess the major manufacturers of plaster boards do not give out BS476 FR test results on all plasterboards.  I assume to have such a test carried out as a one off would cost thousands of pounds.  Any help would be appreciated.  Thanks

Share this post


Link to post
Share on other sites

I think because fire safety in not a science but based on assessment I have never seen a a guide that gives precise reading in minutes for fire resistance they all have used standard levels of FR (30.60,90,120, 240) and in the early days it just referred to the thickness of plaster board/skimming with no test evidence.

Share this post


Link to post
Share on other sites

Join the conversation

You are posting as a guest. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...