Fire barrier (garage ceiling) breeched with pvc waste pipe

I had a two storey extension built last year which comprises of a garage and a bedroom with en-suite above.
The en-suite is all but finished apart from final connections for hot and cold water and waste pipe for shower and sink, currently the waste pipe leaves through the floor and sticks out of the ceiling in the garage. The intention is to run it through the garage to the stack.
Obviously the garage ceiling is acting as a fire barrier due to being a separate fire compartment (comprises of plasterboard and a coat of plaster) but will now be breeched with the PVC waste pipe in two places.
Would this pipework need to be boxed in and either boarded and skimmed or boarded with fire resistant plasterboard?

Completion certificate won't be applied for until the en-suite is up and running.

box it in with 12.5mm plasterboard and skim.

this is all you need to do to satisfy 1/2 hour fire resistance.

Thought so, thanks.

If you only use normal plaster board you will need to double board and skim.

wms said:

If you only use normal plaster board you will need to double board and skim.

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this may achieve a greater degree of resistance.

however, 12.5mm p'board and skim will achieve the minimum required.

noseall said:

12.5mm p'board and skim will achieve the minimum required.

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That's also my understanding and currently the construction of the garage ceiling.

I did an extension over a double garage last year, the ceiling had to be double boarded with 12.5mm plaster board all joints sealed and staggered and all pipes boxed in. All the seams around the wall had to be filled with intumesant sealant and all boards needed a 3mm min skim.
That was as tough as it can get but worth the effort for fire saftey.

Tony