FM Approved Fire Rated Construction Exclusive Haz-Safe Buildings' Wall Design

Exposed walls with tubular steel utilized for vertical members (on 24" centers) and framing of explosion relief panels, vents and doors.  Next, the vertical members will have insulation board and steel furring strips applied.	Close in corner photo with shiny aluminum backed insulation board installed between tubular steel vertical members. 7/8" deep, 20 gauge horizontal steel furring strips on 24" centers installed over insulation and on vertical tubes. Minimum 2" thick fiberglass insulation required in 2 HRFR walls.	Wide angle shot of same corner shows completed half of modular building with porcelain enamel 22 gauge steel sheets bonded on 3/4" thick 2 hour fire rated Ultracode Core gypsum installed on the horizontal furring strips. Minimum 3" fiberglass batt insulation required in 4 HRFR walls.

Haz-Safe Buildings' proven approach to custom engineered pre-manufactured rooms, enclosures and buildings provide superior fire rated performance as well as practical operation and aesthetic considerations (see Porcelain Enamel Steel Finish). Several U.L. tested methods are dependent on type of wall construction materials (wood or steel studs, etc.). Haz-Safe's fire rated gypsum on horizontal furring on tubular steel vertical wall members is Factory Mutual (FM) approved up to 16' high.

N.F.P.A. 30 hour fire rating requirements, as interpreted by FM, are represented in the following chart.

HAZMAT BUILDING DISTANCE FROM ANY WALL OR PROPERTY LINE	HOURLY FIRE RATING
	WALLS	CEILING	OPENINGS
10' or less	4	3	3
10' to 50'	2	1	1-1/2
50' to 75'	1	1	1-1/2
75' or more	None or Noncombustible

Putting Fire Rated Wall Sections In "Perspective":
Standard steel construction of Haz-Safe Buildings' wall has 1/4" thick steel 2" square tubular vertical members on 24" centers with 10 gauge plate continuously welded (air tight sealed building) on the outside of the tubes. Exceeds N.F.P.A. 30 and Factory Mutual (FM) minimum requirement of 120 lbs. per square foot blast rating by 20 lbs. per square foot, up to 8' high. Thicker tube wall or larger tubes are required to reach up to 16' high blast rated FM approved walls. Stud-based walls cannot maintain 100 lbs. per square foot blast rate past 7'6" high!	Unique fire rated construction has the Haz-Safe Buildings' wall with 20 gauge, 7/8"deep steel furring strips attached on 24" centers horizontally across the vertical tubular members. This increases the strength of the wall and is meant to hold applied fire rated gypsum panels off or away from the vertical member. The gypsum board never directly touches the vertical member, creating a thermal break between the inner surfaces and the outer surfaces of the wall, thereby dramatically slowing down the transfer of heat from a fire penetrating through the wall, which increases the fire rating.
Adding a 7/8" deep, 20 gauge horizontal steel furring strip on the outside of the vertical tubular wall members and applying fire rated gypsum on the strip creates a Haz-Safe bi-directional fire rated wall. It also doubles the thermal break capability for slowing down the heat from the fire from passing through the wall. The inside only 2 HRFR fire threat wall is only 3-3/4" thick and the bi-directional 2 HRFR wall is only 5-5/8" thick, which are the thinnest FM approved walls available. This 2 HRFR is achieved with a single layer of 3/4" Ultracode Core gypsum panel by United State Gypsum.	Typical fire rated wall construction utilizes common 20 gauge steel studs at various on-center spacings with fire rated gypsum panels applied directly to both sides of the studs for a fire rated wall. Because gypsum is directly against the full height of the stud, heat from a fire or space heater is more easily passed through the wall; so there is no enhancement of the published fire and insulation rating of the wall, as with Haz-Safe's wall construction. In addition to being 2 HRFR, the wall requires two layers of either 5/8" thick Type X or 1/2" thick Type C fire rated gypsum panels on both sides of the studs, which results in a wall wider than 6".
Double layers of United States Gypsum's Ultracode Core 3/4" thick installed on 7/8" deep, 20 gauge horizontal steel furring strips on both sides of tubular steel vertical members, provide a 4 HRFR bi-directional wall that is only 5-5/8" thick!	Typical quadruple layers of common 5/8" Type X fire rated gypsum board are installed directly on common 20 gauge steel studs at various on-center spacings. Because the gypsum is directly against the full height of the stud, heat from a fire or space heater is more easily passed through the wall. Typical 4 HRFR walls tend to be wider than 8"