Fire rated studs and sheathing...

[HBuilders]

Anyone have to use these in there neck of the woods for a detached garage?
Building inspector up here wants them. I have never had to use them before.
Is this something new. They are definitely pricey and certainly add to the costs. Thanks

 

[Stuart in MN]

Building inspector up here wants them.

Where's 'here'?

 

[slip knot]

For a detatched? I could see it as a fire break in an attached but otherwise why?

 

[RivennHewn]

That doesn't sound right.

You have approved plans? Are they spec'd out on the plans?

The inspector's job is to verify that the building is built per plan.

Sometimes they forget that, and ask for above and beyond what's required.

 

[kbs2244]

I worked in a place once where they did some remodeling.
Office building in Cook Co, IL
That means the “Chicago Code.” The toughest in the country.
They had done the whole thing with wood studs and the fire inspector said no way.
They came up with some kind of paint on all 4 sides of the studs as good enough.

 

[sublimate]

A lot of place require that you do fire-rated walls for detached garages if you build them close or on the property line. Here if you are 5 feet or more from the line you don't have to do fire-rated, but any closer and you do. They don't want a whole row of alley garages to go up.

How close to your property line are you building?

 

[ForceFed70]

I had to have my detached garage fire-rated because I wanted to put an apartment above.

However, the inspector just told me I needed a 2hr burn rating and let me choose how I achieved that rating.

For the walls, it just ment regular studs with 5/8" fire-rated drywall (type X?).
For the ceiling, I went with 2 layers of 5/8" fire-rated drywall along with sound/fire channel.

Fire rated drywall isn't much more expensive than normal drywall. But putting multiple layers along with fire/sound channel on the ceiling certainly added to the cost.

 

[RivennHewn]

Did the plans call for fire rated assemblies?

 

[HBuilders]

Sorry, here is just outside of Boston. They didn't require a full set of plans just drawings.
They insisted that the garage go within 3' of the property line bacause of their open space requirement. Crazy as far as I am concerned.

 

[theoldwizard1]

For the walls, it just ment regular studs with 5/8" fire-rated drywall (type X?).
For the ceiling, I went with 2 layers of 5/8" fire-rated drywall along with sound/fire channel.

Some places allow 2 layers of regular 1/2" drywall (both walls and ceiling). I think joints must be staggered between layers and the first layer only requires tape and 1 coat of mud.

You have to check local codes.

 

[ForceFed70]

Some places allow 2 layers of regular 1/2" drywall (both walls and ceiling). I think joints must be staggered between layers and the first layer only requires tape and 1 coat of mud.

You have to check local codes.

Yes, it all depends on your local codes.

In my area, there was no requirement to stagger the joints (although I had them do it anyway) nor was there a requirement to mud/tape the 1st layer.

However, they also considered regular drywall to have no burn rating. Didn't matter if I had it 1ft thick. Was almost laughed out of the building when I asked about OSB.