Installing ceiling light box between 2 joists

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Old 01-17-15, 01:58 PM
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Installing ceiling light box between 2 joists

How do I install a new junction box between 2 joists in the ceiling?
 
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Old 01-17-15, 02:06 PM
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You are going to need to supply more information. Is the ceiling open or drywalled? If drywalled how do you know where the cable is? Why do you need to splice?
 
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Old 01-17-15, 03:47 PM
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Existing cable.
It's an open ceiling now as I removed everything to redo it.
New ceiling will be 2 layers drywall for soundproofing then wood planks.
 
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Old 01-17-15, 03:53 PM
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Nail a junction box onto each joist run a cable between. Staple to each joist within 8". The box must remaining permanently accessible.
 
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Old 01-17-15, 06:01 PM
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Why 2 junction boxes?
Problem is the middle of room is directly between 2 joists so if I put a junction box on joist, the light will be off centre.
 
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Old 01-17-15, 06:08 PM
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Do you have enough cable to make all the connections in the single box? We were thinking "junction" box, not light ceiling box. If you don't have enough cable, you will need to use two boxes, and extedd from one of them to your light ceiling box.
 
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Old 01-17-15, 06:38 PM
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Yep plenty of cable... it's just one light.
There was plywood between the 2 joists before and a light box hole cut in the middle but I thought I had seen light boxes supported just by small wood pieces or metal extensions?
 
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Old 01-17-15, 07:03 PM
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You need a box with an adjustable hanger.

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http://www.amazon.com/Contractor-CAR.../dp/B00BSYNA1I
 
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Old 01-17-15, 07:24 PM
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You could also add a piece of blocking and use a nail on box.
 
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Old 01-17-15, 09:02 PM
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As I have 2 layers of drywall and 1 layer of planks = 2 1/4", what's the best way to extend the junction box downwards to be level with the planks?
 
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Old 01-17-15, 09:07 PM
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Use a bar box like Ray posted but use a metal box with a 4" box extension ring.

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Last edited by PJmax; 01-17-15 at 09:49 PM. Reason: added pic
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