Fire Rated Ceiling

[A/A Fuel GTX]

I know this is not an NEC issue but I need some help here. I have a single family dwelling that has living space above a three car garage. The garage has the typical ceiling devices, lights, garage door opener recepts, etc. What do I need to do besides using the normal 2 hour rated device boxes to maintain the integrity of the ceiling?

 

[Dennis Alwon]

Nothing. I have never done anything special for this situation. I may be in err but...

 

[walkerj]

As long as you have 2hr rated boxes you are good to go.

 

[A/A Fuel GTX]

Would adding recessed cans change the picture? I've seen cans installed in multi family dwellings where you have the cans boxed in by sheetrock barriers between the first and second floors.

 

[Sierrasparky]

Yes you would need to box in the fixture or use an approved prefab box. If you have a pickey inspector your spacing for any penetrations in the fire reted assembly cannot exceed a certain amount. I think it's 16 sqin. per something? I forget!

 

[A/A Fuel GTX]

I'm assuming the recessed can is looked upon as allowing more smoke/heat being transmitted through it versus a regular 2 hour device box?

 

[Sierrasparky]

I would suppose that if the Recessed fixture was rated and listed for a Resi 1 hour rating then It would be ok

 

[cowboyjwc]

I'm assuming the recessed can is looked upon as allowing more smoke/heat being transmitted through it versus a regular 2 hour device box?

A can light will exceed the 16 sq ins of allowable opening. Remember a two gang is not quite 4x4. But even a smaller can light will not comply as it does not have a 1 hr rating.

 

[A/A Fuel GTX]

A can light will exceed the 16 sq ins of allowable opening. Remember a two gang is not quite 4x4. But even a smaller can light will not comply as it does not have a 1 hr rating.

Therefore the reason for "boxing" in the cans. As always, thanks!

 

[acrwc10]

Therefore the reason for "boxing" in the cans. As always, thanks!

You could use the intumescent covers.:grin:

 

[A/A Fuel GTX]

You could use the intumescent covers.:grin:

Ok....just when I think I this figured out.......Intumescent

 

[Dennis Alwon]

There are recessed cans on the market that are fired rated. There are also fire rated covers on the market

 

[acrwc10]

Intumescent materials, covers, fire pads, blocks, even intumescent paint, are a special material that expand when exposed to extreme heat, and close off the path for smoke and flame spread.

 

[cowboyjwc]

I agree that there is more than one way to make them comply, there are some preboxed lights, as well as some other cover besides the one shown.