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Old 04-24-2019, 08:48 AM   #1
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Drywall over OSB + Electrical Question


Hello,

I am getting ready for an electrical inspection and I need to have my lighting boxes installed. My solution is to put my lighting (pancake) boxes inside ledger boards which will be surface mounted (over drywall). The reason for this is so I don't have to make a mess of my SIP panels (they are expensive). If I drill holes and mount my fixture ledger boards onto the OSB for the inspection, is there a way re-locate my mounting holes accurately after I put up the drywall and then remount the fixture ledger board? I have read about tricks using a nail or a screw with the head cut off to perhaps mark/scribe the hole during installation but I'm wondering if anyone has any other thoughts. I may try and ask the inspector if he will let me wait to install the ledger boards until the final inspection. That may not fly though...
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Old 04-24-2019, 08:57 AM   #2
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Re: Drywall over OSB + Electrical Question


Is your question "how to accurately transfer the hole location to the drywall after closing up the hole?"
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Old 04-24-2019, 09:59 AM   #3
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Re: Drywall over OSB + Electrical Question


Yes. That's what I'm after. Just wanted to give some background on what I am trying to accomplish.
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Old 04-24-2019, 10:01 AM   #4
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Re: Drywall over OSB + Electrical Question


The box should stick out 1/2 from the OSB
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Old 04-24-2019, 10:52 AM   #5
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Re: Drywall over OSB + Electrical Question


I'm using a 1/2"pancake box routed into a ledger board so I don't have to destroy the OSB.
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Old 04-24-2019, 07:46 PM   #6
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Re: Drywall over OSB + Electrical Question


Not directly on topic, but are you legal with pancake boxes? They have very limited box fill capacity (something like a single 14/2) and you mention "lighting boxes" which suggests a run of connected conductors. I don't know if the canopy/base of the fixture can be used as box volume.
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Old 04-25-2019, 09:09 AM   #7
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Re: Drywall over OSB + Electrical Question


Quote:
Originally Posted by jb9 View Post
Yes. That's what I'm after. Just wanted to give some background on what I am trying to accomplish.
How about you mark the opposite walls on each side thru the center of the hole, and measure the distance to the center of the hole? Once the drywall is up, measure back to the center of the hole.
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Old 04-25-2019, 10:17 AM   #8
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Re: Drywall over OSB + Electrical Question


That could work. To answer the previous question, all fixtures will terminate with a 14-2 Romex so the 6 cubic inches of the boxes will be sufficient.

The goal is to avoid destroying my SIP panels.
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