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FMAPPROVAL 4990

Firestopping

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Organization: FM
Publication Date: 1 December 2009
Status: active
Page Count: 30
scope:

This standard sets the performance requirements for firestopping under simulated laboratory conditions. They shall be examined for their ability to prevent the passage of flame and/or heat through or around openings in fire rated walls and floor/ceiling assemblies.

This standard sets the performance requirements for firestopping used to seal joints, voids, gaps or other discontinuities between or bounded by adjacent supporting elements such as walls, floors and at the head of walls against the spread of flame and their capability of accommodating anticipated building movements.

This standard sets the performance requirements for firestopping as it relates to their ability to resist an external force simulated by a hose stream after being subjected to a fire exposure.

This standard includes an optional water leakage test to determine the ability to resist water leakage through penetration fire stop systems in floor/ceiling assemblies when subjected to a standard water exposure.

This standard allows for an alternate fire exposure, method of test and acceptance criteria for use by jurisdictions where the ASTM fire resistance tests are not recognized by the Authority Having Jurisdiction. In those cases, the test assembly shall also be subjected to the hose stream test in order to qualify for Approval.

This standard is intended to evaluate only those hazards investigated and is not intended to determine suitability for the end use of the product.

This standard does not set the performance requirements for or a method of assessing the passage of smoke or air leakage through or around an assembly or the effects of movement of through penetrants.

FM Approvals recognizes the problems caused by the non-thermal damage resulting from the migration of smoke and/or air through a fire stop. A review of the existing test methods currently in the public domain was conducted. None were incorporated into this standard at this time as they were deemed to be inadequate for some purposes of this standard. It is the intention of FM Approvals to conduct research on this topic in the future. At that time, the standard may be revised, or a new standard developed, that will incorporate other test methods and criteria deemed necessary to adequately address the non-thermal damage caused by the movement of smoke through or being emitted by the fire stop.

This standard does not address the ability of electrical penetrations to maintain their circuit integrity or to conduct electricity in fire situations.

The results of tests conducted under the controlled conditions required by this standard shall not be used to describe or appraise performance under actual fire or natural hazard conditions as actual fire and natural hazard conditions vary widely.

This standard does not address the firestopping systems along the perimeter edge of a floor slab.

Approval criteria shall include, but are not limited to, performance requirements, marking requirements, an examination of manufacturing facility(ies), an audit of quality assurance procedures, and a follow-up program.

Purpose

An important technique in property loss control is the subdivision of a building into compartments and subcompartments. This subdivision is usually accomplished by erecting physical barriers that will limit the damage caused by an event to the room of origin. The loss caused by the spread of fire damage can be minimized when effective compartmentation is incorporated into a building's design.

The damage caused by fire increases as it spreads to other areas of a building. Fire will easily spread to other areas of a building due to the collapse of a fire barrier. Fire can spread through openings in fire barriers which allow flames and/or hot gases to pass. Fire can also spread through a fire barrier by the transfer of sufficient heat through an opening that can ignite nearby combustibles on the non fire side of a wall.

One method of combating the spread of fire through openings in or around barriers is to properly design and install firestopping. Firestopping is intended for use in openings in or between fire resistant walls, floor/ceiling assemblies at head of walls and at construction joints between floors and walls.

Document History

FMAPPROVAL 4990
December 1, 2009
Firestopping
This standard sets the performance requirements for firestopping under simulated laboratory conditions. They shall be examined for their ability to prevent the passage of flame and/or heat through or...

References

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