Columbus, Ohio: Fireproof Insulation in Older Homes

[Brad Clarizio]

Hey everyone,

I am working on a major rehab in Columbus, Ohio, specifically in Old Town East for those of you that are familiar. We are just about to call in our first structural inspection so we can move forward with insulation and drywall, but an experienced rehabber friend of mine toured the property last week and called out that we need fireblock between our 1st and 2nd floor. Basically, the house does not have 2x4's blocking the 2 floors, so flames could easily shoot up the sides of the wall. He suggested 2 options:

1: go through and add fireproof 2x4's and use the fireproof spray can foam to seal them (a bit extensive- it's a very large house). 

2: use some sort of fireproof "wool"- he uses stuff made by Owen's Corning but I can't see to find it locally unless I'm commercial, which I'm not. He said he doesn't believe I can use standard fire resistant insulation, but wasn't 100% sure. 

I can't be the first person to run into this issue...what does everyone else do? Suggestions? 

Thanks,

Brad