Rock wool insulation as fire block
Rock wool insulation as fire block
I find one mention of rock wool and two of mineral wool in the residential code. I don't know that rock wool is an insulation. At least I have not seen it being used as an insulation.
R302.4.2 Membrane penetrations. Membrane penetrations shall comply with Section R302.4.1. Where walls are required to have a fire-resistance rating, recessed fixtures shall be installed so that the required fire-resistance rating will not be reduced.
Exceptions:
1. Membrane penetrations of not more than 2-hour fire-resistance-rated walls and partitions by steel electrical boxes that do not exceed 16 square inches (0. m2) in area provided that the aggregate area of the openings through the membrane does not exceed 100 square inches (0. m2) in any 100 square feet (9.29 m2) of wall area. The annular space between the wall membrane and the box shall not exceed 1/8 inch (3.1 mm). Such boxes on opposite sides of the wall shall be separated by one of the following:
1.2 By a horizontal distance of not less than the depth of the wall cavity where the wall cavity is filled with cellulose loose-fill,
rockwool
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orslag mineral wool
insulation.R302.11.1 Fireblocking materials. Except as provided in Section R302.11, Item 4, fireblocking shall consist of the following materials.
1. Two-inch (51 mm) nominal lumber.
2. Two thicknesses of 1-inch (25.4 mm) nominal lumber with broken lap joints.
3. One thickness of 23/32-inch (18.3 mm) wood structural panels with joints backed by /32-inch (18.3mm) wood structural panels.
4. One thickness of 3/4-inch (19.1 mm) particleboard with joints backed by 3/4-inch (19.1 mm) particle- board.
5. One-half-inch (12.7 mm) gypsum board.
6. One-quarter-inch (6.4 mm) cement-based millboard.
7. Batts or blankets of
mineral wool
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or glass fiber or other approved materials installed in such a manner as to be securely retained in place.8. Cellulose insulation installed as tested in accordance with ASTM E119 or UL 263, for the specific appli- cation.
Firestopping with mineral wool
Hello,
So, there are a few parts to your question, and I will try to make sure I address each of them.
To start with I would say that the intent of firestopping is to restore the rating of a floor or wall which carries a rating and has been broken by a penetration or a joint between two separate assemblies. This is done by installing material that was designed, tested, and approved per UL , UL , or ASTM E for the US or CAN/ULC S115 for Canada
Based on the description provided, treating between wood trusses doesn't really fall into any of the firestopping test standards. It isn't restoring an opening within a rated assembly, and it isn't treating the joint between two assemblies.
With that being said, there is nothing we would be able to do from a firestopping standpoint in order to provide a rating for the application described.
As far as does mineral wool always have to be covered in a spray. I would say not necessarily a spray, but some sort of firestop sealant is going to normally be required. I am not aware of any systems that allow for mineral wool as a stand-alone item. However, there may be systems that allow for this, that I am not aware of.
The limiting factor of any firestopping material is what it has been tested to in accordance with one of the test standards above.
Lastly, I am unaware of any rated assemblies with open wood floor and wood trusses. In order to achieve a rating, it would need to be built per a UL/cUL system. Commonly used would be one of the L500 assemblies for a wood floor and truss assembly which would also include a ceiling.
If you have any further questions, don't hesitate to ask.
Regards,
Dakota Reid,
Fire Protection Engineering Team
For more information, please visit rockwool fire resistance.
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