Fire Tested and FM Approved
Fire Rated Construction Exclusive

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 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. 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.

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 tested gypsum board on horizontal furring on tubular steel vertical wall members is Factory Mutual (FM) approved up to 16' high and is protected by U.S. Patent Number 7,934,349 B1.

Certified Testing Lab Fire Testing Haz-Safe Wall:

Haz-safe Buildings' flat bed truck at the entrance of the certified testing laboratories shop door with three blue shrink wrapped continuously welded steel wall samples Fork lift is about to place the Haz-safe wall assembly in the test rig frame. The exterior un painted 10 gauge steel plate of the wall assembly faces the camera. There are to be (10) thermocouples attached to the back of the non fire side of the wall test assembly. The average temperature shall not exceed a predetermined level before the hourly rating to be achieved.
Back of wall test furnace showing the gas lines attached to feed the fire in furnace so 2000 degrees is obtainable. Side of furnace viewing ports to observe the devastation taking place inside. Peeking into a small fire resistant glass protected opening in the side of the furnace you can see that the porcelain steel face of the wall section have disappeared exposing the surface of the gypsum to the full force of the heat of the furnace. Lower right hand corner of the wall sample after the wall has been hit with a fire hose water stream test. Most of the gypsum and insulation has been blown away leaving the 10 guage steel plate to past the test.

Typical Wall Section Figures A-B-C-D.

Haz-safe buildings exclusive fire tested and FM approved wall construction has 10 guage steel plate continuously welded on the non fire side of the vertical members. There isn't the usual gypsum between the steel plate and the tubular steel vertical members which would help keep the plate cool in a fire test. There are over 79 pages of fire tested wall samples in the Gypsum Assoc. Fire Resistance Design Manuel all using wood and steel studs. Not one uses Haz-safe's unitized steel wall construction up to 16' tall which can take 216 lbs.sq.ft. blast per FM Damage 1-44 Limiting Construction Tables 4 and 5 requirements. See B for how this becomes fire rated… Unique Haz-safe Buildings' fire tested and FM approved 1, 2 and 4 hour rated wall construction has furring strips attached horizontally across the vertical tubular members on one side of the wall. This is inside-only fire threat or uni-directional "thin" wall construction. The furring holds various thicknesses and layers of fire rated gypsum panels off of or away from the vertical members creating a thermal break between the inner and outer surfaces of the wall, thereby dramatically slowing down heat from penetrating through the wall. There are no fire tested and approved stud based uni-directional walls except by Haz-safe.
Adding a 7/8" deep, 20 gauge horizontal furring strips on the outside of the vertical tubular wall members and applying fire rated gypsum on the strip creates a Haz-safe Buildings bi-directional wall. It also doubles the thermal break capability for slowing the heat from passing through the wall. The interior space of the wall is filled with heat resistant insulation. The hard part is to continuously weld all the seams the 10 gauge plate on the outside of the wall consisting of gypsum as Haz-safe has been doing for years. In the 18th Edition of the Gypsum Assoc. Fire Resistance Design Manuel every one of the 277 fire tested samples for all types of walls used gypsum with unpainted paper facing just as the panels come from the factory. In the above typical figure of a bi-directional fire rated Haz-safe sample you'll note both sides of the exposed gypsum faces are covered with either 10 or 22 gauge steel plate. Steel is exceptional at passing or transmitting heat, so cladding the wall with steel would make it harder for this wall to pass an actual fire test which is exactly what Haz-safe has achieved. None of the other hazmat building manufactures have actually had there walls fire tested. They only refer to a stud wall test by a number in the Gypsum Manuel performed by a gypsum manufacturer and so avoided testing their own steel clad walls.

N.F.P.A. 30 hour fire rating requirements are represented in the following chart.

10' or less
10' to 50'
50' to 75'
75' or more
None or Noncombustible

This is a representation of our wall design. Actual factory mutual approved wall design may vary slightly.