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Thread: Insulating roofspace over downlighters - are hoods needed ?

Started 1 month, 1 week ago by mikeyw
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Site: DIYnot.com Forum  DIYnot.com Forum - site profile
Forum: Electrics UK  Electrics UK - forum profile
Total authors: 9 authors
Total thread posts: 64 posts
Thread activity: no new posts during last week
Domain info for: diynot.com

Other posts in this thread:

ban-all-sheds replied 1 month, 1 week ago
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ban-all-sheds replied 1 month, 1 week ago
Will those things support the weight of insulation piled over the top? Also items like that are not designed to trap heat, they are designed to intumesce at abnormally high temperatures to stop the spread of fire - normal heat escapes, so you should check that it will provide the right clearances. Finally, what is the room the lights are in? If it's a bathroom or kitchen then ...

mikeyw replied 1 month, 1 week ago
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mikeyw replied 1 month, 1 week ago
Yes they are in a bathroom - excuse my ignorance but why is the moisture prevention so important ? Would it be better not to cover the downlighters at all ? - if I dont all bathroom heat will fly out of the openings where the lights are.

flameport replied 1 month, 1 week ago
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flameport replied 1 month, 1 week ago
If you must have downlighters, this is the type of product to use: http://www.tlc-direct.co.uk/Products/JC94020.html If moisture escapes from the room below into the loft space, it will form condensation causing the loft to go mouldy and the timbers supporting the roof to rot away. The downlighters need to be sealed to prevent this from happening. Fire hoods are useless ...

ban-all-sheds replied 1 month, 1 week ago
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ban-all-sheds replied 1 month, 1 week ago
flameport wrote : If you must have downlighters, this is the type of product to use: http://www.tlc-direct.co.uk/Products/JC94020.html But not over bathrooms. Quote: The downlighters need to be sealed to prevent this from happening. That TLC product does not provide a seal. http://www.nhbc.co.uk/NHBCPublications/LiteratureL ibrary/...

bloxy replied 1 month, 1 week ago
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bloxy replied 1 month, 1 week ago
What you need are these: http://www.tlc-direct.co.uk/Products/TLALC724.html sealed to plasterboard using a general purpose silicone mastic as per instructions.

 

Top contributing authors

Name
Posts
ban-all-sheds
16
user's latest post:
Insulating roofspace over...
Published (2009-11-05 18:07:00)
vik2001 wrote : the reason he said to drill some holes in the plasterboard was to let any heat generated by the downlights naturally escape. they are only very small holes made by a small drill piece. Shouldn't be necessary if the boxes are large enough. Quote: however i understand ban all shed saying not to allow ventilation, but the way is see it, that if a little hot air escapres from within the cover its a good thing. No, it's a...
Lower
15
user's latest post:
Insulating roofspace over...
Published (2009-11-04 15:37:00)
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mikeyw
11
user's latest post:
Insulating roofspace over...
Published (2009-11-04 16:21:00)
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bloxy
10
user's latest post:
Insulating roofspace over...
Published (2009-11-05 18:06:00)
vik2001 wrote : i dont think u can go wrong with the way i did it.... Except that you fail to meet any of the building regs that covering the downlighters is supposed to meet. The idea is to provide a moisture seal and allow the insulation to be continuous over the lights. If you are going to drill holes and leave the boxes uncovered then why bother at all Just cut a 30cm hole in the insulation around the them and leave the opening into the...
flameport
3
user's latest post:
Insulating roofspace over...
Published (2009-11-02 20:20:00)
mikeyw wrote : poxy things Applicable to both the covers and the lights.
vik2001
3
user's latest post:
Insulating roofspace over...
Published (2009-11-05 13:32:00)
the reason he said to drill some holes in the plasterboard was to let any heat generated by the downlights naturally escape. they are only very small holes made by a small drill piece. however i understand ban all shed saying not to allow ventilation, but the way is see it, that if a little hot air escapres from within the cover its a good thing. when making the plasterboard boxes make them so they fit snug in between the joist spaces (that...
wineo
2
user's latest post:
Insulating roofspace over...
Published (2009-11-02 15:28:00)
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Steve
2
user's latest post:
Insulating roofspace over...
Published (2009-11-03 09:53:00)
bloxy wrote : I also fail to understand the dislike of down lighters when properly installed. Theres the issue! There is no way to correctly install them in an upstairs ceiling, without contravening one building regulation or another (spread of fire, moisture control, heat control etc), or severely shortening the life of the bulbs. bloxy wrote : If you have down lighters and want to keep them and insulate over them then use Loftcaps. It...
aptsys
2
user's latest post:
Insulating roofspace over...
Published (2009-11-03 19:10:00)
Lower wrote : ...As such they have a removable bezel which might not be perfectly sealed but isn't far off so moisture migration shouldn't be an issue... You are correct. All of the types I've seen with the glass front have a proper silicone or neoprene seal that prevents moisture migration. All you have to worry about is ensuring adequate clearance between the fitting and your insulation.

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