IC box for Pot light nailed to the joist


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Old 10-10-14, 11:07 AM
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IC box for Pot light nailed to the joist

Hi,

I am installing pot lights upstairs and using IC metal boxes for the lights. In the attic, the joists are about 3 feet apart and are 2 by 4 inches in size.

My question is, is it ok to nail the arms of the IC metal box to the joist on one side or do I need to build the box around the IC box to nail both sides of the box to the joists as the box arms are not that long.

What is the building code regarding this issue. I live in Toronto, Ontario, Canada.

Thanks

Naveed
 
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Old 10-10-14, 12:01 PM
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Your pot light arms should extend far enough to reach both ends. The arms are two pieces, which can be pulled in both directions separately.
If not, just add some 2x4 pieces to the joists. Also put a vapor barrier on any o boxes in the attic.

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Old 10-10-14, 12:09 PM
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or do I need to build the box around the IC box to nail both sides of the box to the joists
You want both sides/legs of can secured. Along one joist, you could assemble a simple wood U shape, measurements don't even need to be accurate as Can legs are adjustable.
For me, if you haven't cut holes in ceiling yet, I would just go with remodel cans. They are available in IC models and it sounds like you will have no problem with placement. And it keeps you out of attic, which is always a plus.
 
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Old 10-10-14, 02:02 PM
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If the joists are 36" apart, I'd just put two 2x4's between the joists as blocking... space them 16" apart... and turn the fixture 90 so as to nail it to the new blocking.
 
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Old 10-10-14, 03:19 PM
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Or just use remodel cans as Brian suggested.
 
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Old 10-10-14, 03:47 PM
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How can you work in the attic when the ceiling beams are 2x4's and three feet apart ?
I'd be afraid of falling thru.
 
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Old 10-10-14, 04:02 PM
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PJ,

You weren't an apprentice long enough to get your attic legs. Welcome to my life whenever attic work needs doing.

And thats what laying down planks is for.
 
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Old 10-10-14, 04:12 PM
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Oh I've been in plenty off attics. Not as many now as I used to. I used to get all the attic fans.
Now... seniority rules.

But 2x4's on 36" centers scares me.
 
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Old 10-10-14, 04:16 PM
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I see IC mentioned but didn't see AT (air tight). I just picked up some cans and the store had mixed up the inventory where there were IC (without being air tight) mixed in with the ICAT ones. Where this is exposed to an attic, AT is very important.

@Mr.A, those planks don't work very well on 2x4's buried under 16" of insulation, but I hear you.

Bud
 
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Old 10-10-14, 04:33 PM
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2x4s on 36 inch centers sound like the bottom chord of trusses rather than ceiling joists. I would also be very wary of crawling around in that attic.
 
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Old 10-15-14, 01:12 PM
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Thanks a lot guys. It was really helpful. I was able to install the IC boxes without any issues.

Now I have a different issue.I am using Luminus par20 7w dimmable led bulbs with Leviton 6674 dimmer switch (it has a slide dimmer and a separate on/off switch). If I keep the slider to off position and then turn on the switch, the bulb light comes on (say 10%) right away. I have installed 6 pot lights in the room and even with 10% brightness, the room is so bright which I do not want.

Can please someone tell me which led bulbs and/or dimmer switch, I should use to get either 0% or 1% as minimum dimming brightness when the slider is at off position (all the way down).

Or is there a way to get the bulb turned off when the slider is at off position even if I turn on the switch.

Thanks in advance.

Naveed
 
 

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