Downlights in kingspan

[Carlosfandango]

Extension consisting of a kitchen and dining room with a sloped ceiling. Directly above the paperboard will be 160mm of kingspan with a 80mm airspace above. The customer wants downlighters and I was planning on boring a 110mm hole in the kingspan before the paperboard goes up. Obviously this is going to compromise the insulation value but what else can I do? There's no option to lower the ceiling! Can I use the standard downlighter ring or do they need to be firerated or might I be better to use an LED fitting? Only problem is that the lights need to be tilts as the ceiling is sloped.
Cheers in advance.

 

[telectrix]

110mm hole is about right. i would use swivel mount GU10s with LEDs. they don't need to be fire rated if the ceiling is not a fire barrier.

 

[Carlosfandango]

Would the 110mm hole be enough for the heat to dissipate from the Leds? And do you think the hole would need to go right through the full depth of the kingspan or just deeper than the lamp? If that makes sense?

 

[Richard Burns]

Depends what the manufacturers instructions say, they normally have a minimum distance to keep away from adjoining materials, this can vary widely from about 50mm to 200mm!
If you have a very short LED fitting that only needs 50mm clearance then you would not have to go through the whole lot.

 

[Guitarist]

I have come across this before, to the detriment of the fittings. Yes, LED's have a low heat-output, but they do require some spacing to maximise their lifespan.
Surface mount lighting is the only way to go imo.

 

[Darkwood]

If you can retro fit 50w halogens in the GU10 then you need to design for this senerio... just because you fit LED's if you go down that road doesn't mean they wont be changed at any point in the future.
If the lean-to ceiling of the kitchen has open airways through into the house i.e. through the pipe or cable routing then the fire rating of the ceiling needs to be maintained or a suitable fire foam to block all entries to house in the void.

 

[James Ingrem]

Hi, i would personnaly use a firerated led downlight so that the fire barrier is restored but you can also get the type that can be completly enclosed in insulation (have a heat shunt on the back) then you have no worries (and done in tilts)

 

[i=p/u]

Meaning use sealed units and follow md

 

[i=p/u]

F rated