Holes in between suspending ceil and hollowcore

[Moggaman]

Hi 

I have 2 questions please. 
I have hollowcore , then 150 suspended ceiling . The electrics and mvhr people broke out holes to get services thru in this area . Do I need to mortar up around these on internal walls? . Is it good practice .

 2. The electrician also brought out some cables thru the external block.. what tape is best to airtight these?

thanks

 

[Carrerahill]

I would use fire rated penetration seal. 

 

Google fire sealing penetrations and you will get plenty of examples of products and methods to use.

 

Mortar would work but might be a bit permanent and difficult to break out without damaging services if repairs or upgrades are needed.

 

The stuff we spec is envirograf.

[nod]

It shouldn’t really mater 

If you are concerned you could up rate the plasterboard To one hour protection What ever you put around the plastic pipes won’t hold a fire back 

It will simply melt the pipes Better stopping any potential fire getting in there 

[TonyT]

Depending on skill level.

shutter and pour concrete around pipes.

 

remove shutter, bead of fire foam around perimeter ceiling/wall if required.

 

you get rock wool coated with intumescent sealant that lets you seal risers, cut to shape and sealed with intumescent sealer.

lots of options