hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Well guys I'm in a little un-charted territory as I've not done any rated ceilings in a long while and especially a two hour rated one, where we have two layers of 5/8" fire rock on the ceiling, and the construction is open truss floor joist.
To get a variance from the state requirement of a sprinkler system because of the building size is over the 5,000 square foot which would normally require it to be sprinkled but would not require the fire wall separation between the upstairs dwelling and the down stairs light commercial. the state is requiring a two hour barrier between dwelling and store, it's a combined owner operator type building where the owner lives upstairs and runs a small store down stairs.
So I have to figure out my penetrations to make sure they are UL compliant for a two hour rating
One is I have a bathroom downstairs with a shower with no windows so a bath fan will be required, I have used a automatic damper on them before and I think they are rated for up to a rating? has anyone else found anything cheaper or better for a bath fan?
Also I have several recessed 6" can lights I know Prescolite makes a UL classified 2 hour rated can, but not sure if they are still available or if I can locate them in my area as Halo, Thomas, and a few others are more common in this area, does anyone know of any other brands who make cans for 2 hour rated ceilings, the last one I did was 15 years ago and no one made rated cans so we had to build a box using two layers of 5/8" fire rock around each can which was very costly in labor so I'm looking for something a little more cost efficient?
Also I'll be using 4"x4" (1900 box's) with 1 1/4" rings which if I remember right has a two hour rating, is this still true?
One other question is: with the two layers of fire rock on only one side of the wall is it still required to maintain the 24" penetration separation on the opposite side of the wall with other openings such as receptacles or switches, or is there a product that I can put around the box like the putty pads or other fire rated products that would eliminate this requirement as I have a kitchen/break room back to back with the dwelling garage with both having receptacles and switch's on both sides making it almost impossible to keep the 24" separation or even using a different stud space?
Any help would be most appreciated, they funny thing is in most cases here in Indiana very few fire walls are ever required, none in dwellings and most apartment buildings only have the party wall type fire wall required between each unit so we don't get into many firewalls that include a ceiling as most commercial here is only one story or the size require the building to be sprinkled which eliminates most fire walls or ceilings here, but the owner has got this variance to keep cost down but opened a can of worms with other items.
To get a variance from the state requirement of a sprinkler system because of the building size is over the 5,000 square foot which would normally require it to be sprinkled but would not require the fire wall separation between the upstairs dwelling and the down stairs light commercial. the state is requiring a two hour barrier between dwelling and store, it's a combined owner operator type building where the owner lives upstairs and runs a small store down stairs.
So I have to figure out my penetrations to make sure they are UL compliant for a two hour rating
One is I have a bathroom downstairs with a shower with no windows so a bath fan will be required, I have used a automatic damper on them before and I think they are rated for up to a rating? has anyone else found anything cheaper or better for a bath fan?
Also I have several recessed 6" can lights I know Prescolite makes a UL classified 2 hour rated can, but not sure if they are still available or if I can locate them in my area as Halo, Thomas, and a few others are more common in this area, does anyone know of any other brands who make cans for 2 hour rated ceilings, the last one I did was 15 years ago and no one made rated cans so we had to build a box using two layers of 5/8" fire rock around each can which was very costly in labor so I'm looking for something a little more cost efficient?
Also I'll be using 4"x4" (1900 box's) with 1 1/4" rings which if I remember right has a two hour rating, is this still true?
One other question is: with the two layers of fire rock on only one side of the wall is it still required to maintain the 24" penetration separation on the opposite side of the wall with other openings such as receptacles or switches, or is there a product that I can put around the box like the putty pads or other fire rated products that would eliminate this requirement as I have a kitchen/break room back to back with the dwelling garage with both having receptacles and switch's on both sides making it almost impossible to keep the 24" separation or even using a different stud space?
Any help would be most appreciated, they funny thing is in most cases here in Indiana very few fire walls are ever required, none in dwellings and most apartment buildings only have the party wall type fire wall required between each unit so we don't get into many firewalls that include a ceiling as most commercial here is only one story or the size require the building to be sprinkled which eliminates most fire walls or ceilings here, but the owner has got this variance to keep cost down but opened a can of worms with other items.
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