Fire Ratings Of Sheet Metal

Rockwall fire rated wall panels consist of a unique rockwool mineral fibre core called conrock with laminated sheet steel permanently bonded to both sides.

Fire ratings of sheet metal.

Fire ratings for roofs are classified as either class a class b class c or are unrated if a roof covering cannot meet the requirements for any of these classifications. Astm e119 tests on loaded structural steel and composite steel concrete beams are always restrained and result in 2 ratings. When 9 16 inch steel deck is used the restrained assembly rating 1 1 2 hr. I am not aware of a fire rated wall assembly using sheet metal.

According to the book commercial drafting and detailing a typical one hour fire rated wall consists of 2x4 studs spaced 16 inches from the center of one stud to the center of the next covered by 5 8 inch type x gypsum board. Other materials can be used including concrete masonry for walls and spray applied fire resistive materials. Sheet metal penetrations are used in rated assemblies and when correctly fire caulked become part of that assembly. Fire ratings are based on an assembly.

Once rockwall panels have been installed according to the specific intertek warnock hersey certification guidelines the assembly provides 1 2 and 3 hours of fire resistance with a 4 5 and 6 core thickness respectively. Rated floors often use sheet metal pan decking most often with a pour of light weight or standard concrete on top. Type x gypsum board is wallboard to which non combustible fibers have been added. When it comes to fire prevention because they use cold formed steel metal buildings have an integral advantage over other building types.

One sheet of 5 8 type x sheetrock has no fire rating. The most common fire rating material used in metal buildings is gypsum wallboard. 1 restrained beam rating based on the period of fire exposure where the beam sustains the applied design load but not more than twice the corresponding unrestrained beam rating and provided the later is 1 hour or more. Metal roof systems are required to be fire classified because of the concern about the combustibility of the materials under the metal panels.

Quarles senior scientist insurance institute for business home safety richburg sc. When 28 gauge steel deck is used the restrained assembly rating 1 1 2 hr. Roof eaves overhangs are a fire hazard but they can be protected with an encasement of fire resistant material. Fire resistance classifications the 2012 and 2015 ibc in section 1505 of chapter 15 states that fire classification of roof assemblies is based on two tests astm e108 and ul 790 that are.

It usually consists of two or three coats over metal reinforcing mesh. But when it is used one on each side of a properly framed wall it can become a fire rated wall. A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source. And 2 unrestrained beam rating based on the period of fire exposure where the average measured temperature at any section of the steel beam.