Pete Posted April 8, 2019 Share Posted April 8, 2019 (edited) I have not decided whether to use downlighters or the narrow panel Led lights that some have used but my main concern is that I have my VCL directly above the lights. I know the led lights do not produce as much heat as the halogen ones used to but it still concerns what the heat long term will do to the VCL. I know I could put some form of barrier in place but has anybody had to deal with this situation? TIA Distance from plasterboard to VCL is 120mm. Edited April 8, 2019 by Pete Link to comment Share on other sites More sharing options...
Onoff Posted April 8, 2019 Share Posted April 8, 2019 I've used Thermahoods. They do low profile ones. Gets expensive if lots to do. I saw something similar in Wickes the other day. https://www.thermahooddirect.com/product/thermahood-th-095-square-low-profile-downlight-cover-pack-of-10no/? Link to comment Share on other sites More sharing options...
AdamSee Posted April 8, 2019 Share Posted April 8, 2019 I had a similar issue in my bathroom. Its a flat roof with Joists were 100mm deep with a additional piece on top to give it a slope for water drainage. After I had it insulated above you could clearly see the foil PIR through the gaps in the old roof boards. So i made some chipboard boxes and painted the corners with blowerproof and fitted a piece of EPDM as a makeshift cable grommet. Not only did it give me a bit of peace of mind that any heat wouldn't affect the foil, but it also allowed me to tape the VCL under the joists and into the boxes to maintain air tightness in the bathroom. Link to comment Share on other sites More sharing options...
Onoff Posted April 8, 2019 Share Posted April 8, 2019 (edited) I originally had a lovely, airtight vcl between the ceiling pb and underside of 145mm joists. Multiple penetration now with said downlights, speakers etc. At each downlight I've carefully removed the pir in between the joists leaving the foil. You can just see the green vcl. The Thermahoods will be stuck down to the pb with intumescent mastic then the whole thing foamed in. Flexible metal conduit will come out from the foam into proper conduit. I'm aiming to this bond the Thermahood edge to the cut edge where the vcl is, to go some way to reinstating the vcl. The Thermahood will become part of the vcl in effect. I can't do that with the body dryer so I'm going to line the vertical edges over the blue vcl with Asbestolux type fire proof panelling. All edges again will be intumescent sealed. This'll then be capped over with pink pb on an intumescent foam seal and a slab of pir over that. All screwed down for future access to the body dryer terminals. (Red Commando jobbie is a test plug from when I took it into work to try). This'll be wired again in galv conduit back to the board. Edited April 8, 2019 by Onoff Link to comment Share on other sites More sharing options...
Onoff Posted April 8, 2019 Share Posted April 8, 2019 (edited) Double post! Edited April 8, 2019 by Onoff Link to comment Share on other sites More sharing options...
Onoff Posted April 8, 2019 Share Posted April 8, 2019 Clay flower pots are an option for "hoods". Hole in the top though... Link to comment Share on other sites More sharing options...
Jeremy Harris Posted April 8, 2019 Share Posted April 8, 2019 I originally fitted downlighters with MR16 LEDs, then changed them for very low profile LED panel lights. These barely get warm, and only project about 6mm behind a skimmed plasterboard ceiling (they project about 21mm up from the rear face of the front flange). I'd say that there would be no need at all to protect a VCL some 50mm above these, given that they only every get around 10 to 20 °C above room temperature. Link to comment Share on other sites More sharing options...
Construction Channel Posted April 8, 2019 Share Posted April 8, 2019 Annoyingly because I can't find any low profile down lights that are fire rated. My electrician has demanded I put some kind of fire hood over them. We ended up going for intumescent blanket over the top of them. (fitted before the plasterboard goes up.) https://www.fireproofpaint.co.uk/shop/fire-barriers/fb70-fire-barrier-curtain/ Link to comment Share on other sites More sharing options...
Onoff Posted April 8, 2019 Share Posted April 8, 2019 24 minutes ago, Construction Channel said: Annoyingly because I can't find any low profile down lights that are fire rated. My electrician has demanded I put some kind of fire hood over them. We ended up going for intumescent blanket over the top of them. (fitted before the plasterboard goes up.) Look harder! https://www.downlightsdirect.co.uk/shallow-downlights.html 1 Link to comment Share on other sites More sharing options...
Construction Channel Posted April 8, 2019 Share Posted April 8, 2019 Bit late for that ? But in my defence I was looking for the bigger flatter ones like this https://www.lampshoponline.com/15w-round-led-light-panel-200mm-26w-pl-replacement.html?gclid=Cj0KCQjw4qvlBRDiARIsAHme6ov66B6xY9cLEBSzhIxLOljk1eb9jepVIRY3KKp6MXR0HTEpmjPplUkaAjs5EALw_wcB The blanket cost £100 to cover 27 lights so it's still its not that far out. Possibly even cheaper with the blanket. Link to comment Share on other sites More sharing options...
dpmiller Posted April 9, 2019 Share Posted April 9, 2019 Have BCOs ever checked that a specific luminaire installed is actually fire rated? Looks like it would be a paper exercise with the slim jobbies- alloy housing , pressed steel backplate... Link to comment Share on other sites More sharing options...
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