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[cobre]

I have to install a secondary ceiling independent of the existing lathe and plaster ceiling to meet 60 minute fire regulations. The secondary ceiling will only support the weight of a double layer of 12.5 mm Soundbloc plasterboard and need to be completely independent of the existing ceiling . The maximum span is 3.8 metres at widest point and tapers to 2.8 mteresover a 9 metre length. Can anyone help with the joist size that would be required

[cubleyboy]

I have to install a secondary ceiling independent of the existing lathe and plaster ceiling to meet 60 minute fire regulations. The secondary ceiling will only support the weight of a double layer of 12.5 mm Soundbloc plasterboard and need to be completely independent of the existing ceiling . The maximum span is 3.8 metres at widest point and tapers to 2.8 mteresover a 9 metre length. Can anyone help with the joist size that would be required

Hi Cobre, I would think the easiest and quickest way for you would be to fit a suspended metal frame ceiling. This will cover your fire regs with double boards. Best of all job done and skimmed in a couple of days!


Cubleyboy.

[cobre]

Hi Cubleboy Thanks for your response my main problem is the fact that the ew ceiling needs to be totally independent of the existing ceiling and as far as I know the metal system will require to be suspended off of the existing joists for a 3.8 M span
Cobre

[chris_on_tour2002]

cobre - is there a specific reason why it has to be independent of the existing ceiling?

[cobre]

Hi
I have spoken to sound engineers and if the ceiling is attached to the existing ceiling it could transmit sound and may not pass the sound test.
I am also dropping this ceiling by 1 metre so have plenty of room for timber joists and I acn use my existing workers rather that a suspended ceiling company

[andy01]

find the building regs part a (structural) 1992 - not the current version, use to be on the planning portal

in the back are span tables