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SBH  
#1 Posted : 23 June 2010 12:23:45(UTC)
Rank: Super forum user
SBH
Opinions are required as to whether 1 inch rebated doors that slot into each other can be classed as a fire door if the strips are missing, they do offet a tight fit

SBH
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safetyamateur  
#2 Posted : 23 June 2010 12:49:26(UTC)
Rank: Super forum user
safetyamateur
SBH, I guess the real test is whether they are hot & cold smoke tight and not just tight.
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djupnorth  
#3 Posted : 23 June 2010 13:38:38(UTC)
Rank: Forum user
djupnorth
You would need to check the relevant British Standard. However, my recollection is that 1" rebates no longer meet the required standard. Fire doors need to have an intumescent seal and appropriate cold smoke seal.

Regards.

DJ
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bleve  
#4 Posted : 23 June 2010 17:41:38(UTC)
Rank: Super forum user
bleve
SBH we need a bit more information to determine suitability as a nominal fire door.

You say the strips are missing? Are they actuall missing or not provided?

What is the nature of premises? sleeping accomodation, health care etc

Where are the doors located within the premises? Access to staircase, corridor sub division, area of high fire risk etc

What materials are the doors?

What thickness?

Frame detail?

Gap at architrave ?

How many hinges? Type ?

Door closer?

Glazing?

Regards
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shaunmckeever  
#5 Posted : 24 June 2010 14:15:44(UTC)
Rank: Guest
Guest
I'm not sure what you mean 'slot into each other' but generally doors with 1" rebates are no longer satisfactory as fire doors. Tests were undertaken some time ago showing that the rebates failed to prevent an adequate seal between the fire side and the protected side due to pressure build in the room of the fire forcing smoke past the rebate.
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firesafety101  
#6 Posted : 24 June 2010 14:23:12(UTC)
Rank: Super forum user
firesafety101
So do all doors with 1" rebates have now to be changed?
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shaunmckeever  
#7 Posted : 24 June 2010 14:37:24(UTC)
Rank: Guest
Guest
That's down to your assessment Chris but 1" rebates do not provide an adequate seal between the room of fire and the protected space.
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MaxPayne  
#8 Posted : 24 June 2010 14:43:18(UTC)
Rank: Super forum user
MaxPayne
ChrisBurns wrote:
So do all doors with 1" rebates have now to be changed?


My understanding is that Building Regs are not necessarily applied retrospectivley, however if you are the responsible person for the building you may want to plan to bring them upto the latest standard or make the change anyway subject to your fire risk assessment.

http://www.planningporta...bcapproveddocumentslist/

http://www.bwf.org.uk/firedoors/
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bleve  
#9 Posted : 24 June 2010 15:40:52(UTC)
Rank: Super forum user
bleve
Shaun is correct, a 25mm rebate will result in 35 m^3/hr smoke leakage when subjected to a delta P of 25 vs the required 3 m^3/hr.

However, dependent on the outcome of the r/a the existing door may be suitable for its current duty and may remain in place until the time of necessary replacement or upgrade.

If it is to function as a fire and smoke door then the existing arrangemnt would not be acceptable.
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bleve  
#10 Posted : 24 June 2010 15:44:44(UTC)
Rank: Super forum user
bleve
thats delta p of 25 pa
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