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Afirestop or fire-stopping is a form of passive fire protection that is used to seal around openings and between joints in a fire-resistance-rated wall or floor assembly. Firestops are designed to maintain the fire-resistance rating of a wall or floor assembly intended to impede the spread of fire and smoke.[1]

Firestops prevent unprotected horizontal and vertical penetrations in a fire-resistance-rated wall or floor assembly from creating a route by which fire and smoke can spread that would otherwise have been fire resisting construction, e.g. where a pipe passes through a firewall.

Fire stopping is also to seal around gaps between fire resisting constructions, e.g. the linear gap between a wall and the floor above, in order for construction to form a complete barrier to fire and smoke spread.

Classification for penetrations and the barriers they penetrate, are categorized by a standardized letter-number system that has been adopted by all firestop products manufacturers.[2][3] A typical system would consist of several letters, followed by a series of numbers indicating the type of penetrant that is passing through the particular barrier ex: (FB-5533.)

Firestops should be maintained in accordance with the certification listing. Construction documentation sometimes includes an inventory of all firestops in a building, with drawings indicating their location and certification listings. Using this, a building owner can meet the fire code relating to fire barriers. Improper repairs may otherwise result, which would violate the fire code and could allow a fire to travel between areas intended by code to be separated during a fire.

Firestop materials are not rated per se. They receive a fire rating by combining materials in an arrangement specific to the item (a pipe or cable, for example) penetrating the fire-rated wall or floor and the construction arrangement of the fire-rated wall or floor. A two-hour-rated pipe-penetration firestop may consist of a layer of caulking over packed mineral wool. The arrangement, not the caulking, provides the two-hour rating. The individual firestop materials and the overall firestop assembly are listed.

When the installed configuration does not comply with the appropriate certification listing, the fire-resistance rating may be lower than expected. Each opening in a fire-resistance-rated wall or floor in a building must have a certification listing. There are thousands of listings from various certification and testing laboratories. The Canadian and United States Underwriters Laboratories publish books listing firestop manufacturers who have contracted with them for testing and certification.

Older buildings often lack firestops. A thorough inspection can identify all vertical and horizontal fire barriers and their fire ratings, and all breaches in these barriers (which can be sealed with approved methods).

Firestops created by contractors or building maintenance personnel which are not listed are not credited with an adequate fire resistance rating for building-code compliance purposes. They are usually short-term, cost-cutting measures at the expense of fire safety and code compliance. One common error is citing a listing for a product which may be for another use. An insulation with an active listing of a certain flame-spread rating is unacceptable for firestopping purposes.

STI is an industry leader in developing innovative firestop solutions for various applications and environments. STI firestop products, which are designed to prevent the spread of fire, smoke, and hot gases through penetrations and joints in firerated walls and floors.

SpecSeal, EZ Path, Triple S, Ready, SpeedFlex, FyreFlange, E-Wrap, and Firestop Locator are registered trademarks of Specified Technologies Inc. Powershield , Fast Tack , and HighTraffic are trademarks of Specified Technologies Inc. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

EZ Path Marine Cable Transits are the industry's only zero-maintenance transit device designed to take control of your fire-rated divisions in non-watertight applications without the need to mechanically seal openings.

This advanced hybrid polymer sealant cures in the presence of atmospheric moisture and is designed for fire-rated divisions. MFS offers better water resistance than conventional silicone sealants and forms a tight, durable elastomeric seal, preventing the transmission of air, smoke and gasses.

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Many of our courses are accredited and registered with the American Institute of Architects (AIA - LU/HSW), the International Code Council (ICC - CEU) and BICSI (CEC), click on the below course title and explore what we have to offer.

In the built environment, firestop systems are a critical safeguard against the spread of heat, fire or smoke through breaches in floors and walls. These breaches made during construction allow construction of joints, openings or penetrations through a fire-resistance-rated wall or floor. The expertise of a qualified firestop contractor is needed to select and install a firestop system to protect the breaches made for penetrations and joints of fire-resistance-rated wall and horizontal assemblies. Learn more about the UL Firestop Contractor Program.

Georgia Firestop, Inc. specializes in the design, installation, and maintenance of firestop systems in both new and existing facilities. We are an accredited specialty firestop contractor and a member of Firestop Contractors International Association. We are trained and certified by all major firestop manufacturers giving us the knowledge to provide and install the most cost efficient solution to any firestop needs.

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 1479, UL 2079, or ASTM E 2307 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

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