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Steel Back Your Specification

11/8/2016

15 Comments

 
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Contributed by Michael C. Kerner
Many factors must be considered when a design specifies cold-formed steel framing members. Material selection will impact nearly every member of the construction team including the architect, engineer, specifier, code official, distributor and contractor - and could even impact the safety of building occupants. Therefore, it is imperative that there’s an understanding of requirements needed for steel framing members to be designated as code compliant.  
 
One of the most commonly specified materials for commercial construction is steel. Generally used for both load-bearing (structural) and non-load bearing wall and floor systems (non-structural), millions of pounds of the material is used every year for the non-combustible construction of office and apartment buildings, hotels and hospitals across country.     
 
But, how does a contractor know if the steel studs being purchased meet International Building Code (IBC) and ASTM requirements? For some products, such as fire-rated doors, this is easy because the products bear the label of a recognized third party inspection agency. For the architect, builder and general contractor, it is important that they receive the building products the specifications demand.
 
For metal studs, ASTM C645 (drywall framing) and ASTM C955 (structural framing) are the standards referenced in the code. These documents specify the minimum criteria for: decimal thickness, type and weight of protective coating, mechanical properties of the steel, physical configuration of the stud and labeling requirements. Without meeting all the requirements, metal studs are not code compliant.
 
For example, a structural load-bearing stud is required to list the “coating designator”, CP-60, in the ink jet stream and in all supporting literature. The same consideration should be given when writing the specification, the coating designator, CP-60, should be listed.  All these criteria must be met for a steel stud to be code compliant.
  
Building Occupant Safety

In addition to the building code requirements, there is one other important issue that must be recognized by both the installer and the design professional. The use of non-compliant material can create life-safety issues. For example, if a stud is required to be a certain thickness to attain a specific limiting height and/or carry a certain load, what effect is there when a thinner metal is used than what is specified? The stud may fail and cause injury to the building occupants, or in a life-safety situation such as a fire, the rated partition may fail and it would not allow the building occupants time to escape.

It is also possible that an individual product is code-compliant, yet it will not perform as intended in a life-safety situation. As an example, a metal stud could meet the minimum requirements of ASTM C645 yet not meet the requirements of the fire-rated assembly in which it is used. How is this possible?
 
Word of Caution

Keep in mind that ASTM specifications are minimum requirements for the product. These requirements must be checked against the actual products used in a tested assembly. For example, the disconnect can occur when comparing building code requirements against the method in which a given fire-rated assembly must be constructed.
 
For example, if an architect’s partition schedule calls for UL Design U411, but only calls out the depth of the stud, then the following scenario may occur: The contractor will supply a stud that meets the project specifications, which call for the product to comply with ASTM C645. However, if the actual tested assembly were researched, it would reveal that the stud would require a return lip of 3/8 inch (10 mm). This is much larger than the 3/16-inch (5-mm) return lip C645 requires. Therefore, the partition would not meet the fire-rated assembly construction requirements. The correct products and proper assembly must be employed or life-safety issues are raised in the building. If the proper products cannot be sourced, then a different tested assembly may need to be substituted.
 
Knowledge of the building codes for your jurisdiction is imperative to determine if a product is code-compliant. If you are not sure, ask your manufacturer. It may take some extra time to research, but when the integrity of the products and our industry are at stake, it would certainly seem worthy of our attention.
15 Comments
corten link
2/7/2021 01:27:31 am

Steel is graded as a way of classification and is often categorized into four groups Carbon, Alloy, Stainless, and Tool. Carbon Steels only contain trace amounts of elements besides carbon and iron. This group is the most common, accounting for 90% of steel production.

Reply
Fintech Schweiz link
2/25/2021 11:08:44 am

Hello
Many factors must be considered when a design specifies cold-formed steel framing members. Material selection will impact nearly every member of the construction team including the architect, engineer, specifier,

Reply
Fintech Schweiz link
3/15/2021 10:21:52 am

Hello
Alloy, Stainless, and Tool. Carbon Steels only contain trace amounts of elements besides carbon and iron. This group is the most common, accounting for 90% of steel production.

Reply
qr code link
3/25/2021 08:05:05 am

Stainless, and Tool. Carbon Steels only contain trace amounts of elements besides carbon and iron. This group is the most common, accounting for 90% of steel production.

Reply
Anna link
3/26/2021 11:40:29 am

Occupant safety is a big concern for many architects, engineers, contractors, and building owners. Often, time's people who are responsible for building occupant safety either don't understand it themselves, or they don't have a strong commitment to making sure that it is done properly. You can help yourself to ensure building occupant safety by becoming educated about the building you're designing, finding an experienced professional to do the designs, and following all standards set forth by your architect or engineer. There is nothing more important than the health and well being of every individual that work in your building.

Reply
Jack link
3/28/2021 11:18:40 am

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fintech development outsourcing link
4/9/2021 08:30:16 am

Many factors must be considered when a design specifies cold-formed steel framing members. Material selection will impact nearly every member of the construction team including the architect, engineer, specifier,

Reply
Emma link
4/25/2021 02:16:26 am

With the passage of time, a number of industries have come up with different ways of providing better quality steel. One such example is using steels in their specification. Steels are typically used for their tensile strength and torsion consistency. If you are looking for steels for your industry, this is the right article to read. The steels that we use for various applications are discussed and explained in this article. If you have any queries regarding your specification, feel free to drop a line in the comment box below.

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5/2/2021 04:09:02 am

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Fabrication link
5/9/2021 09:11:18 am

If you've been contemplating having your spine reexamined and you're wondering if you should get a steel back brace, the first question you should ask yourself is "What exactly is a steel back brace?" It's an actual medical-grade back brace that has been specifically created to help those who experience pain from their back or who have just plain old back problems. The term 'steel back' comes from the material the brace itself is made of: galvanized steel. In addition to the material, the brace is crafted to meet very specific guidelines and specifications that are set forth by the American Medical Association and the American College of Sports Medicine. Not only are these medical professionals involved in the design and manufacture of the brace, but they are also responsible for a strict quality control process that ensures the materials, joints, straps, and other aspects of the back brace don't cause undue discomfort or injury to the patient.

What does it mean when people say that a back brace can help relieve some of your back pain? Basically, a back brace helps take the pressure off the muscles that are located around the lower and upper portions of the lumbar region of the back. The stress that this area experiences on a regular basis can lead to a variety of different back conditions, such as degenerative disc disease, osteoarthritis, spondylolysis, spondylolisthesis, spondylosis, and even spinal stenosis. As you may not know, many of these conditions require surgery or other forms of medical intervention in order to correct the issue. This means that you may be stuck with a painful condition for the rest of your life, rather than just a temporary fix for your back pain. By getting a steel back brace treatment, you may be able to prevent any of these problems from becoming a reality.

So how do you know if you need to ask your doctor about a back brace? While most people aren't likely to notice a difference right away, in time you should be able to notice a difference in how your back feels. If you are going to wear one, it is important that you look at it as a tool to help prevent future problems from occurring. As you take a closer look at your back, you will probably find that there are a number of different areas that you can treat yourself, without the use of a brace. By using a back brace treatment at the right time, you should be able to strengthen the muscles in your back and provide your back with some much needed relief.

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Beverly Minyard link
7/20/2021 11:02:08 am

I didn't know that every year millions of pounds of steel are used in construction. My sister owns a construction company, she mostly builds houses so she doesn't use a whole lot of steel. But bigger buildings must use a ton of steel to build.

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