Plastic new construction fan box weight limit?

[Roger9]

A lot of the guys I work with use a plastic fan box to rough in foyer, dining room lights etc. I’m talking about the fan boxes that come with 10x2 screws, some people call em saddle boxes, they screw right into a truss. on the box it says it’s rated for 70lb fan 150lb fixture. Would you guys trust 2 #10 screws to hold up 118lb fixture? Everyone I work with swears it’s fine. I’m skeptical but maybe I’m paranoid

 

[CoolWill]

Yes, I would trust those #10 screws to hold a 118 lb. fixture. I bet you could suspend your body weight from that box.

 

[Little Bill]

A lot of the guys I work with use a plastic fan box to rough in foyer, dining room lights etc. I’m talking about the fan boxes that come with 10x2 screws, some people call em saddle boxes, they screw right into a truss. on the box it says it’s rated for 70lb fan 150lb fixture. Would you guys trust 2 #10 screws to hold up 118lb fixture? Everyone I work with swears it’s fine. I’m skeptical but maybe I’m paranoid

Those screws are actually lag screws and are not holding the fan to the box, they screw the fan, box, directly into a joist/trust. I've put hundreds of them in. There are two smaller screws that hold the box to the truss and two larger ones that go through the fan mount, box, and into the truss.

 

[LarryFine]

What they said.

 

[Roger9]

Those screws are actually lag screws and are not holding the fan to the box, they screw the fan, box, directly into a joist/trust. I've put hundreds of them in. There are two smaller screws that hold the box to the truss and two larger ones that go through the fan mount, box, and into the truss.

A lot of the guys I work with use a plastic fan box to rough in foyer, dining room lights etc. I’m talking about the fan boxes that come with 10x2 screws, some people call em saddle boxes, they screw right into a truss. on the box it says it’s rated for 70lb fan 150lb fixture. Would you guys trust 2 #10 screws to hold up 118lb fixture? Everyone I work with swears it’s fine. I’m skeptical but maybe I’m paranoid

I appreciate the responses and I agree with you all I guess I’m just a little paranoid. Let me ask you all this, one of the guys I worked with installed a heavy chandelier on another job I think the fixture weight around 100lbs and instead of cutting the extra long nipple he drilled the 2x4 that the fixture is secured from. I checked myself and this is not a truss, it’s a board the rough crew nailed to the truss. Does this need to be fixed? i stumbled across this while adding some can lights, this is my brother in law’s license so I’m extra cautious!

 

[CoolWill]

I appreciate the responses and I agree with you all I guess I’m just a little paranoid. Let me ask you all this, one of the guys I worked with installed a heavy chandelier on another job I think the fixture weight around 100lbs and instead of cutting the extra long nipple he drilled the 2x4 that the fixture is secured from. I checked myself and this is not a truss, it’s a board the rough crew nailed to the truss. Does this need to be fixed? i stumbled across this while adding some can lights, this is my brother in law’s license so I’m extra cautious!

The problem here isn't really mechanical. The chandelier wiring is outside of the box and it is not a type of wire allowed to be used in that manner.

 

[kwired]

Many metal fan boxes are held in place by #12 screws though they are usually only an inch long instead of 2 inches long, then have #10 machine screws to hang the fan from the box.