How to fit plaster in LED profile to ceiling plasterboard when using resilient bars

[markharro]

I am trying to understand how this is done as the profile is normally screwed into the plasterboard and presumably then into a background joist but this isnt possible when using res bars so how do you keep the profile in place? I am assuming just screwing into the plasterboard wont be enough? 

 

Would it be better gluing with something like CT1? Thanks

[Thorfun]

We glued with pink grip

[Spinny]

Don't all plaster-in lights like downlights just get screwed into the plasterboard and then the skim coat also helps to hold them in place. By definition you can't put a downlight underneath a joist.

 

Don't you just need to use a plaster-in LED profile, screw it to the plasterboard and then plaster it in with the skim coat ?

[Thorfun]

looking at the photo looks like I used some plasterboard screw as well. Can’t remember if they were in to the res bars or not though. Sorry. 
 

i’m sure pink grip would be strong enough though. Our plasterers used it for all the edge beadings. 
 

@nod will be able to give you a definitive answer though. 

[Spinny]

Didn't know you could get crazy bendy profile like this one...

 

https://reeltechdirect.com/products/flexible-plaster-in-led-profile

 

Admittedly a lot of these profiles are as deep as the plasterboard. I guess maybe double boarding the ceiling is the answer or you will end up cutting right through the board ?

I am putting some in rooflight upstands, but here the plasterboard attaches directly to the continuous insulated plywood upstand.

[nod]

The easiest way is to mark you lights on the floor and run a length of top hat either side Then add a 100 mil pattress in between the two top hats Board your ceiling Then transfer the lines from the floor and cut out 

 

If you must use res bar You can fix pattress in between but on to the joists 

If you don’t put timber in They will crack 

[markharro]

@nod thanks - having a bit of an issue visualising this mainly because I am unsure what "top hat" is? You dont have any sort of picture of what you mean do you?

[Nickfromwales]

27 minutes ago, markharro said:

@nod thanks - having a bit of an issue visualising this mainly because I am unsure what "top hat" is? You dont have any sort of picture of what you mean do you?

https://www.ceilingtilesuk.co.uk/product/mf5-furring-channel-top-hat-3600mm-mf-ceilings/?1&ft=true&utm_campaign=PMAXW-Shopping&gad_source=1&gad_campaignid=21670932886&gbraid=0AAAAADxRNNWI9JmkQ-Qpl9DkshjATYJ-U&gclid=CjwKCAjwl_XBBhAUEiwAWK2hzqSPXOY1GzYYPCyOeSp9yPUlQdr59EVk7yMhPyOjZN4A5M94PsGpzBoCq78QAvD_BwE