Flat roofs, celotex and downlights...

[Octopus]

Got an extension to fit down lights into - can anyone please point me in the direction of the latest regs and guidance regarding this thorny issue

Thanks

 

[Rpa07]

What have you done with Murdoch?

 

[jackhammerJIM]

A very grey area . Better speaking direct to the building inspector and builder .

 

[Octopus]

What have you done with Murdoch?

Nothing yet..... the roof structure and extension is under construction.... not ready for 1st fix yet.

 

[Toneyz]

We all know that downlights are available to be installed with insulation covering I don't think that you will be able to fit one with remote LED driver as it burns them out .How much of the insulation would you have to cut away?.I think that you will have to fit one with LED GU10 lamp however the danger is someone installing a 50watt gu10

 

[jackhammerJIM]

Never had a problem installing them personally . However a fussy building inspector could refuse to sign off .

 

[jackhammerJIM]

We all know that downlights are available to be installed with insulation covering I don't think that you will be able to fit one with remote LED driver as it burns them out .How much of the insulation would you have to cut away?.I think that you will have to fit one with LED GU10 lamp however the danger is someone installing a 50watt gu10

The insulation will likely be solid celotex/kingspan . whoever insulates leaves a gap .

 

[Toneyz]

The insulation will likely be solid celotex/kingspan . whoever insulates leaves a gap .

In theory your going to have heat loss/cold spots hence why manufactures have developed downlights which insulation can cover I think that a lot will depend upon the exact construction detail.

 

[jackhammerJIM]

In theory your going to have heat loss/cold spots hence why manufactures have developed downlights which insulation can cover I think that a lot will depend upon the exact construction detail.

I understand that but when you have a 100mm downlight sat in 100mm of celotex there won't be much insulation covering it

 

[J.C.E]

get builder to cut 100mm hole out where you coil for a downlight
or a slot is slightly easy job when it comes to fitting the downlight in

 

[Octopus]

^^ so a 100mm hole all the way through the celotex? Not sure about that!

 

[Des 56]

Once you ask of the building inspector the problem will not be yours,it seems to be a wise sparky who will ask the question but I have always just gone ahead and cut

What about making separate compartments,I wonder if that is a solution for a long discussed problem ?

 

[Toneyz]

As I posted a lot is dependant upon construction of the roof the joist depth and where the Kingspan/celotex sits etc.

 

[J.C.E]

The u value will not be effected enough to worry

Dont suppose they are having veluxs are they...well theres a bit more that a 100mm hole

 

[jackhammerJIM]

As I posted a lot is dependant upon construction of the roof the joist depth and where the Kingspan/celotex sits etc.

7"x 2" joists , 125mm kingspan in between joist + 25mm kingspan on underside of joist.
2 inch air gap above .