![]() A UL system is proof that the products installed to restore the rating have been tested at UL and are listed in the UL directory. Every different type and size of pipe and cable penetrating through various walls and floors must have a UL tested and listed system firestopping it. For each of these applications a UL system must be installed to restore the rating of that wall or floor/ceiling and thus prevent the spread of fire, smoke and/or noxious gases. There also may be linear openings at the intersections or corners of construction joints such as can be found at fire-rated wall and floor/ceiling joints where fire could spread from room to room. ![]() If not properly “firestopped” a fire could travel through the annular space, spreading from room to room. Fire-rated construction may have openings created by items such as pipes and cables that pass through fire-rated walls or floors – but by penetrating it the fire rating of the entire wall or floor is reduced to zero. Red: materials or devices that seal the opening and restore the fire rating of the constructionĪ UL system is like a “recipe” that includes instructions and drawings on how to install a proper firestop system. Firestop foam is rated as a system depending on how it is used, and is tested to ASTM E814 which is the “Standard Test Method for Fire Tests of Through-Penetration Fire Stops”īlue: penetrating item, such as pipes, cables or ductwork.Designed to contain a fire for a rated amount of time.Material or product is approved as a fireblock.Resists the free passage of flame through a building.That’s why it’s important to know the difference between a non-rated fireblock foam and a rated firestop foam. Getting it wrong the other way could put lives at risk: installing a fireblock foam in rated construction without an accompanying approved system detail could allow fire to penetrate the rated assembly and spread from room to room or floor to floor faster than the rating would indicate. 3M Scotchfil® putty is UL Recognised as a splice insulation for electrical conductors at temperatures up to 80 ☌ when over-wrapped with either Scotch® Super 33+ or Super 88 Vinyl Electrical Tape. If firestop foam is mistakenly installed in non-rated construction, it might be overengineered and more expensive, but not actually harmful. Product description 3M Scotchfil® Electrical Insulation Putty is an electrical grade putty in a tape form. The basic difference is that a fireblock foam is installed in non-rated construction, so there is no need to provide a UL System Detail to the Authority Having Jurisdiction whereas a firestop foam is put in rated construction and must be installed according to a UL System Detail. As penetrants are exposed to fire, the intumescent property of this material allows the sealant to expand and help maintain a firestop penetration seal for up to 4 hours. This sealant also acts as a barrier to airborne sound transmission. Fireblock/firestop, to-may-to/to-mah-to, right? No – and it’s important to understand why. 3M Fire Barrier Sealant CP 25WB+ is a one-component, latex-based, intumescent sealant that dries to form a monolithic firestop seal.
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