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Dormer loft conversion-Down lights

Discussion in 'Electrics UK' started by Jitno123, 25 May 2017.

  1. Jitno123

    Jitno123

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    Hi all,

    I'm currently having my loft converted and I plan to have some downlights in the flat roof dormer. Just wondering is the a way to have downlighs without cutting away the celotex? I have seen these 'low profile integrated led' ones which are quite slim. Has any one come across these? I ask as I don't want to cut large holes in the insulation!

    Thanks
     
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  3. freddiemercurystwin

    freddiemercurystwin

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    Have you the headroom to have a service void?
     
  4. Jitno123

    Jitno123

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    Hi, by service void do you mean adding a false ceiling? The head room is fairly limited as it is. The joists going into the rsj for the dormer are 120mm, filled with 100mm celotex.

    Is the a way to avoid cutting away at the celotex? Do low profile down lights exist
     
  5. 333rocky333

    333rocky333

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    Although the actual led light bit is less than 20mm in some cases, there still needs to be space to accommodate the driver that runs them and that is somewhat bigger and needs a bit of airflow
     
  6. chivers67

    chivers67

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  7. bobsuerita

    bobsuerita

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    whynot go for warm roof or you can get suface mounted ones
     
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  9. ericmark

    ericmark

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    [​IMG] The lamp holder shown is called a GX53, I have never used one, but clearly a flush mount, it would seem both CFL and LED lamps fit the holder, in other words lamps which do not produce much heat.

    This is one of many options, there are many LED lamps which do not have replaceable bulbs which are more flush than example shown, not sure about the idea of not having a replaceable bulb, but they do seem popular.

    Because a bigger diameter to the 2 inch lamp which sinks into the ceiling likely they would better, 2 inch is really to small.
     
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  10. Taylortwocities

    Taylortwocities

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    If you chop holes in your insulation your local friendly building inspector will tell you to bloomin well take them out and re-instate the insulation. Or you won't get your building notice signed off.
    The Aurora lights (above) may be a solution but even they need a 40mm free depth.
    Note that the Aurora lights are 4", 5", 6" in diameter.
     
  11. sparkwright

    sparkwright

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    I've known builders to construct a special frame within the ceiling joists house spots whilst maintaining some integrity of the celotex.

    How compliant this actually was I couldn't say though.
     
  12. John D v2.0

    John D v2.0

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    It's compliant as long as the overall u value is good enough, and the worst u value is still better than the limiting u value. Also the vcl has to be sufficient.
    I'd expect the bco to want to see evidence that it's been worked out correctly, but they may or may not.
     
  13. Taylortwocities

    Taylortwocities

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    The only way to do it is to discuss the options with your BCO before you buy or install anything.
     
  14. chappers

    chappers

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    The bottom line is he will never know, in all my days and probably 40 plus loft conversions, I've never seen a BCO pull out down lighters or question if the insulation has been moved.
    I understand your concern though, find some slim LEDs and set the driver/s somewhere remote maybe behind a panel in the wall, or under the eaves.
     
  15. DIYnot Local

    DIYnot Local

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