![]() ![]() For slabs poured specifically as a safe room bases, the minimum recommended slab surface area is typically the footprint of the safe room plus 12" on all four sides, with the required depth of the slab excavation ranging from 8" to 36" deep, to be determined based on the safe room configuration. The slab can be a square or rectangular so long as the minimum depth and surface area requirements are met.įor comparison, most 2-car garages with a 4" deep slab usually have a minimum of 400 sq ft and around 5 cubic yards of concrete, and often more.įor slabs with smaller surface areas, the thickness of the slab must be greater than 4" to compensate for the smaller surface area to ensure enough mass is present. For a 4" thick slab, this equates to about 250-300 sq ft of surface area. A good rule of thumb is to have a minimum of about 3.0 - 3.5 cubic yards of concrete mass to serve as your safe room base. "OF ADEQUATE MASS AND GEOMETRY": Even though the slab may qualify as "standard reinforced", it still needs to have an adequate mass, shape and configuration to effectively serve as a secure anchorage for your safe room.ĭon't worry.the vast majority of 2-car garage slabs meet all the requirements, as do nearly all single-car garages. NOTE: We DO NOT do anything to compromise the integrity or warranty of post-tension cable slabs! It detects steel as deep as 6" below the surface of the concrete, and allows us to easily determine not only the presence of steel, but also which type of steel reinforcement was used in the slab and where it lies within the concrete. The slab most likely has rebar, 6圆 wire mesh (aka "hogwire") or post-tension cables present, which is inbedded in the slab during the slab pourĪt Tornado Alley Armor, we use electronic sensing devices designed specifically to detect steel embedded in concrete.(Contractors often use 2x4's or 2圆's to frame in the area of a new slab pour and fill to the top of the boards) ![]() The slab is most likely 4" thick or more.The concrete mixture used is most likely classified as 3000# or greater test strength, which meets FEMA and NSSA recommendations.The slab has most likely been inspected by a building inspector during construction to ensure it meets local building codes.That means a few things are most likely true: The newer the slab, the higher the probability that it is of suitable construction for a safe room. "A STANDARD REINFORCED CONCRETE SLAB": As a general rule, if the slab you're considering is less than 40-50 years old or so, it's most likely a "standard reinforced concrete slab". We appreciate your interest in our product, please feel free to contact our office with any inquiries.In a previous blog we referred to a "standard reinforced concrete slab of adequate mass and geometry" for an acceptable anchoring location for safe rooms. All of the units are powder coated for a long lasting life. The design is so simple and DIY friendly that only the door frame and door sub panel are different sizes, all the other panels are the same size and are bolted together with grade 8 steel hardware and anchored securely to a slab floor. Installation on these units takes approximately 2-3 hours. All that is needed for installations is a couple of wrenches, a drill, and couple of folks for assisting in the lifting on panels. All size units can be simply shipped on a 4圆 pallet nationwide. This steel safe room is completely Do It Yourself friendly, affordable, reolocatable, and entrapment proof making this unit the perfect fit for any family. This unit is FEMA 320 Compliant, NSSA Verified, and has been Texas Tech Tested to withstand the forces on an F5 tornado. We have been in the storm shelter business for over three generations. This unit is one of a kind and is patented by the US Government for our companies original design. We would like to introduce you to our newest product on the line, our steel safe.
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