Cut in box for 2 layers of drywall

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O

olly

Senior Member
Location
Berthoud, Colorado
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Master Electrician
I need a 4" round cut in for 2 layers of drywall. Any one know of a good one? Its just has to hold a low profile LED trim. But it needs long ears 1 1/8" of drywall.
 
You can take the "wings" off and turn them around sometimes to extend them, depending on the thickness of the material. I have also put in longer screws to make them work.
 
James L said:
Or take out the factory screws and replace with 3" deck screws.

I've done it both ways
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Where have I heard that? I know.................









Little Bill said:
You can take the "wings" off and turn them around sometimes to extend them, depending on the thickness of the material. I have also put in longer screws to make them work.
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:)
 
You could use a 1609728706931.png and a pair of 1609728747514.png

Or, a 1609728816316.png would probably wedge in the hole.

If it doesn't have to be round, there's always 1609729017141.png or a 1609728895642.png with 1609728912788.png
 
2 layers of sheet rock could be a 2 hr wall assembly - need proper protection for a 1 hr box, cannot use plastic cut in in a rated wall only metal. you may have to mount the box to a stud & have a putty pad for protection.
 
Why are there two layers of rock? If this is a rated assembly a cut in box will probably not be allowed.

Roger
 
electrofelon said:
IIRC the carlon round blue bombers with the three wings are rated 5 pound fixture only in a wall. Not sure if it's different for the allied molded.
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Carlon is 50 lbs for walls.

Allied Moulded is 15 lbs for walls

They both say not for ceilings, but that Carlon does ceilings better than any other, imo
 
I have to clarify post #14, I agree with mwm's comment about the box must be secured to structure however, some non metallic boxes can be used in 1 and 2 hr rated partitions and as long as the opening does not exceed 16 sq in it would not necessarily need additional protection.

Roger
 
roger said:
Why are there two layers of rock? If this is a rated assembly a cut in box will probably not be allowed.
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Very important question.
My son was remodeling his basement, the recommended soundproofing was 2 layers of 5/8" drywall separated by about a line of caulking/adhesive. fire rating was not the concern.
 
Remodelers put stuff together just like roofers all the time. Instead of tearing all the layers off, they just keep adding layers on top of what's already there

I recently wired a kitchen remodel. It was a small kitchen and small dining room with a wall separating the two, and it became one big kitchen. When they took out the wall between, they realized the two ceilings were not on the same plane. Someone had overlaid the dining room ceiling with another layer of sheetrock. Both rooms had the most awful-looking texture.

What was the remedy? Do you think they took any of that drywall off? Nope. They added a layer on the kitchen ceiling to match the second layer in the dining room, then they added a third layer on the entire ceiling to make it all smooth

And it all passed inspection.

I can tell you, it was not easy to attach cut in cans.

I had one large pendant over the island. I laid a 2X6 flat on the back side of the drywall with an octagon box cut through the sheetrock
 
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