Galvanized Sheet Metal Fire Rating

Fire ratings are based on an assembly.

Galvanized sheet metal fire rating.

Sheet metal penetrations are used in rated assemblies and when correctly fire caulked. Occasionally the american galvanizers association gets the question of whether the galvanized coating is adversely affected by exposure to fire. The load bearing capacity of corrugated steel without fire protection is 15 30 minutes depending on the structure. The most common fire rating material used in metal buildings is gypsum wallboard.

The steel sheet bends but the load bearing capability remains for a significant amount of time. A galvanized sheet by itself would not have a fire rating. Box 739 kennedale tx 76060 physical address 528 s. I am not aware of a fire rated wall assembly using sheet metal.

Kennedale tx 76060 phone 817 478 0801 fax 817 483 6571 page 6 of 43 sheet metal standards duct guage and enforcing for 1 ess drive heavy ga metal gauge of metal duct dimensions 5 joint 4 joint 2 5 joint 2 joint. Fire ratings are generally based upon testing of a structural sample. Temperatures in fires can easily exceed 1 000 f. Specifications methods to determine fire resistance ratings for generic designs can be found in most building codes e g chapter 7 fire resistance rated construction international building code international code council falls church va 2003.

There is a potential for coating damage but many have found fire damage to minimal on galvanized steel. Suburban sheet metal ltd mailing address p o. If combined with gypsum or other materials in an assembly it. When there is no insulation used on top of the corrugated steel sheet the heat goes through the metal and dissipates upwards and the.

A specific field erected construction of an assemblage of materials designed to prevent the spread of fire through openings. Both designs allow for new and retrofit metal building use and provide the flexibility to meet future energy code requirements for higher insulation levels. One sheet of 5 8 type x sheetrock has no fire rating. V421 which pro vides 1 and 2 hour fire resistance ratings for exteri or walls in metal buildings.

But when it is used one on each side of a properly framed wall it can become a fire rated wall. W404 1 hour rated fire wall and w413 2hour rated fire wall. The nonfire side of a fire rated assembly exceeds 325 degrees above its ambient temperature. The ratings are for unsymmetrical walls that require ratings from both sides.

The thickness and number of the layers of type x gypsum wallboard are specified for each. A wide variety of fire rated galvanized sheet options are available to you such as aisi astm and jis.