Mud Ring

[Alwayslearningelec]

Thought you always needed plaster/mud ring when fire alarm device on sheetrock wall.

 

[infinity]

Not for many fire alarm devices like the one shown. They make a mud ring for a 4 11/16 box that has the same size and pattern of the 1900 box shown.

 

[PaulMmn]

I thought a mud ring was only needed when the face of the box is not flush with the surface of the sheetrock.

 

[Rick 0920]

I thought a mud ring was only needed when the face of the box is not flush with the surface of the sheetrock.

Some horn/strobes mount directly to a 1900 box. If you use a Caddy or B-line screw gun box bracket, you can gauge the bracket for 1 1/2" and use a 2 1/8" deep box. With 5/8" sheetrock that would put the box flush with the finished wall.

 

[lordofthisworld]

Thought you always needed plaster/mud ring when fire alarm device on sheetrock wall.

View attachment 2569034

No, speaker/strobes take a deep 4 square 3.5 deep box with no mud ring. You also can use a 4 11/16' with a 2 gang mud ring

 

[Alwayslearningelec]

No, speaker/strobes take a deep 4 square 3.5 deep box with no mud ring. You also can use a 4 11/16' with a 2 gang mud ring

Wait so now I'm a little confused. The size of the box will determine whether or not a mud ring is needed?

 

[rc/retired]

Wait so now I'm a little confused. The size of the box will determine whether or not a mud ring is needed?

A mud ring is not required. Whatever box or mud ring you use is dependent upon how the device attaches.

Ron

 

[LarryFine]

Wait so now I'm a little confused. The size of the box will determine whether or not a mud ring is needed?

Basically, yes. The back plate of the horn/strobe units I've installed have keyholes like a 4" cover, so they will mount directly on the 8-32s of a 4" sq box. A 4-11/16" box is too big, but the right mud-ring will allow the backing plate to be installed on one.

For example: