![]() If you have any questions regarding your concrete, if you need plans for a slab you will install, or if you need a slab poured for your safe room please contact us at 855-55-ARMOR. It is imperative that tornado-force wind cannot erode the soil at the perimeter of the slab to the point that the wind can get under the slab. The amount of exposed concrete side wall above grade should generally be limited to a maximum of 2" of exposed concrete, with the additional thickness below grade or protected from direct wind erosion. 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)
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