Fire Separation / Fire Stopping



MAGG have extensive practical experience in the installation of fire separation / fire stopping systems, which allows us to take the confusion and complications out of such a wide range and variety of fire stopping solutions on the market.

Fire separation measures are intended to contain a fire in the fire compartment of origin, thus limiting the spread of fire and smoke for a limited period of time, as determined the local building code and fire code. Passive fire protection measures, such as firestops, fire walls, and fire doors, are tested to determine the fire-resistance rating of the final assembly, usually expressed in terms of hours of fire resistance (e.g., ⅓, ¾, 1, 1½, 2, 3, 4 hour). A certification listing provides the limitations of the rating.

Contrary to active fire protection measures, passive fire protection means do not typically require electric or electronic activation or a degree of motion. Exceptions to that particular rule of thumb are fire dampers (fire-resistive closures within air ducts, excluding grease ducts) and fire door closers, which must move, open and shut in order to work, as well as all intumescent products, which swell, thus move, in order to function.

There are mainly two types of PFP: intumescent fire protection and vermiculite fire protection. In vermiculite fire protection, the structural steel members are covered with vermiculite materials, mostly a very thick layer. This is a cheaper option as compared to an intumescent one, but is very crude and aesthetically unpleasant. Moreover, if the environment is corrosive in nature, then the vermiculite option is not advisable, as there is the possibility of water seeping into it (because of the porous nature of vermiculite), and there it is difficult to monitor for corrosion. Intumescent fireproofing is a layer of paint which is applied along with the coating system on the structural steel members. The thickness of this intumescent coating is dependent on the steel section used. For calculation of DFT (dry film thickness) a factor called Hp/A (heated perimeter divided by cross sectional area), referred to as “section factor” and expressed in m−1, is used. Intumescent coatings are applied as an intermediate coat in a coating system (primer, intermediate, and top/finish coat). Because of the relatively low thickness of this intumescent coating (usually in the 350- to 700-micrometer range), nice finish, and anti-corrosive nature, intumescent coatings are preferred on the basis of aesthetics and performance.

To experience how MAGG Group can help keep you, your team and your building Fire Safe, call us on 0800 802 1888 or request a callback from one of our experienced members of staff.

Case Studies