Anti-Projectile by Haz-Safe

Anti-Projectile Walls

“Bullet proof” is popular tag that needs to be defined. Using the known caliber of a bullet a wall can be designed and tested to stop any slug. In industrial applications it is possible to approximate projectiles that may be parts of an exploded metal component under testing and make comparisons to known caliber of bullets so as to design a protection/barrier wall system. Various thicknesses of fiberglass panels have been pre-tested by certified laboratories per UL-752 protocol and graded as to what particular Level Grade from 1 up depending on the size of bullet that has been successfully stopped. Larger objects than bullets are also projectiles and need to be stopped such as the breaking apart of spinning components or exploding cylinders, etc. There could also be a pressure wave and or the object could be heavy and propelled such that it will hit with tremendous force that will require the armored walls to be blast rated. Haz-safe Buildings has combined materials to construct a wall enclosure system that incorporates various (A) thicknesses of “bullet Proof” fiberglass panels, (B) within a tubular steel framed wall, (C) clad with continuously welded 10 gauge steel in the form of pre-manufactured wall assemblies that can be shipped to the job site and installed (utilizing patented bolt up technology) in one or two days around the area where the testing and industrial process are taking place.

Two holes where projectiles penetrated the 22 gauge steel bonded on ¾” gypsum but not the ¼” thick anti-projectile fiberglass panel within the wall.

A projectile (parts of a drive shaft) bounced off the stainless steel floor grating to bounce off 22 gauge steel bonded on ¾” gypsum wall surface.


Single level anti-projectile corner wall assembly: Pink anti-projectile fiberglass panels attached to horizontal steel furring on the right. The left is yellow sound absorbing mineral wool held in place with expanded metal screen. In this application the projectile wall surrounds clients existing walled in area and the projectile threat is only against opposite walls.	Opposing wall assemblies: On the left is the outside walls painted 10 gauge steel plate and the other is the inside walls 9 gauge expanded steel screen over 8 lbs.sq.ft. density sound absorbing mineral wool (expected event will happen with a loud explosion).


Haz-safe anti-projectile wall assemblies shall be joined together with US Patented Modular bolt up hardware here being piled on a pallet for shipment. There are eight end caps and eight bolt up joint sleeves all lined up, and several more 1” dia. threaded bolt up rods will need be added.	Four Anti-projectile upper walls outside corner bracing ready for palletizing shrink wrap and shipping. Corner bracing is required when the walls are free standing with no ceiling/roof to add strength. In this application the projectile walls are to surround client’s existing walls that prevent inside former bracing.


Excess horizontal 1” dia. bolt up rod is cut off at both ends after the rod has been tightened (actually pulling the wall assemblies tightly together and self aligns completed wall assembly over uneven existing foundation).	Worker tightens up the last of the boltup 1” dia. nuts. The hole in the anti-projectile is for the client to feed into the room tubular components to be tested under extreme high pressure before shipment to client locations.	Anti-projectile fiberglass panel attached to 180 lbs.sq.ft. blast rated door as seen through inside opening of client’s existing light weight steel building wall.


The installation is almost complete with the bolt up nuts and washers all in place (dark spots at the bottom and top of the corner of the wall) on the ends of the horizontal tension rods internally holding the whole 10’ high x 27’ wide x 35’ long anti-projectile wall assembly together. To complete the installation the corner bracing needs to be attached and paint touchup …	The installation is complete with the upper corner bracing bolted and welded in place and the paint touched up. User is proceeding to install their equipment so as to be able feed their product into, test and remove out of the room created by Haz-safe Buildings with 27’ wide x 35’ long x 10’ high anti-projectile walls. Installation was completed in three days.

Keeping the height at 12' but increasing the wall's blast resistance requirement from 100 lbs. to 150 lbs. per square foot requires the masonry walls rebar to be increased from 3/4" to 1" dia. and the block to increase from 10" to 12" wide. On the Haz-Safe example, the 2" x 4" tubular wall of the above third example has applied to it the same "sandwich" ingredients of the second example, which raises the wall's blast rating to 159 lbs. per square foot. It should also be stated the masonry walls are inherently fire rated but would require furring strips and insulation board to be added in order to acquire equal insulation value of the Haz-Safe insulated wall example.

Twenty foot high (bi-level stacked assemblies) x 21’ wide x 23’ long anti-projectile wall installation nearly complete except for cutting off excess 1” dia. vertical bolt down rods poking out above the top of the walls. Exterior has painted 10 gauge steel plate continuously welded onto tubular framed wall assemblies that are bolted together utilizing US patented modular hardware hidden within the interior of the walls. The wall/hardware strength is proven as there is no header above the door connecting each wall. This allows the facilities overhead bridge crane to lift in and out of the room client’s product for testing.

Double hung swing door is 8’ wide x 20’ high, 215 lbs.sq.ft. blast rated and Level 1 anti-projectile resistant. Each leaf is one continuous 4’ wide x 20’ long assembly weighing a little less than 1,500 lbs apiece. Seen through the opening are the two separate levels of the 215 lbs.sq.ft. blast rated and Level 1 anti-projectile resistant wall structure. Lower level wall assembly shows the white porcelain enamel finished steel that is on 3/4" gypsum that is on pink anti-projectile fiberglass panels which are uncovered on the upper level wall assembly.

Inside to the left of the 20’ high door showing the 10’ high lower level wall assembly finished with a porcelain enamel 22 gauge steel that is bonded to ¾” thick gypsum that is fastened to ¼” thick anti-projectile fiberglass panels. The porcelain enamel finish provides (A) 95% reflectivity of the overhead light onto the product being readied and tested in the middle of the room and (B) together with the ¾” gypsum helps blunt very sharp projectiles before they penetrate to the fiberglass panel within the wall.

Inside to the right of the 20’ high door showing the 10’ high upper level wall assembly finished with ¼” thick anti-projectile fiberglass panels without being covered with porcelain enamel steel bonded to ¾” thick gypsum. All corners of the room have tubular steel bracing which here allows the wall to remain ridged even when each 1,500 lbs.sq.ft. door leaf swings. The extruded aluminum trim have silicone caulk filled concave inner surface sealing the walls so that they can be hosed down after each product is tested.