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I am beginning to fire block or fire safe my basement. I know that I need to fill the void between the stud cap and the sill plate of the home, which is about a 3" gap between.

Can I use rock-wool insulation Roxul, sold by home depot? I will cut 15" to 20" pieces and fit it into the cavities above the stud cap in between the floor joists. Will this pass my fire blocking inspection.

The suggestions from the inspector are: 5/8" sheetrock, 3/4" plywood or firesafe material. Any suggestions as to what fire-safing material is? Is rock-wool insulation considered fire-safing material?

I am in Montville, NJ.
 

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ROCKWOOL stone wool hampers a fire’s progress. ROCKWOOL fire-protecting insulation, thanks to its fibers’ resistance to high temperatures, will limit the effects of a fire:



Designing for fire safety
Protects flammable constructions or those susceptible to the effects of fire
Increases elements of building structures’ resistance to fire
Slows down heat transfer up to high temperatures
Its fibrous structure does not melt away below 1000°C
Even if not used primarily for fire protection, due to its non-combustibility ROCKWOOL insulation does not fuel or spread fire by releasing heat, smoke, or burning droplets.

ROCKWOOL products are used in all types of structures for fire protection: elements of building structure to EN 13501-2, ventilation equipment to EN 13501-3, smoke control equipment to EN 13501-4, and external exposure to EN 13501-5.

As a result, ROCKWOOL products improve the safety of occupants and rescuers, as well as protecting property and belongings in the event of a fire.
 
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