![]() Many builders install doorway casings with mitered joints, which allow matching trim pieces to connect at equal angles in the top corners.Two major considerations when finding a favorite style are joint choice and sizing. When setting out to design doorway casing, homeowners will find a wide variety of options, from simple trim with a completely flat surface to more elaborate (and often wider) options with intricate moldings and protrusions. The thinner edge will be installed toward the inside of the door frame to reduce bulk in the doorway, while the thicker outside edge matches the depth of the base trim to create a cohesive threshold. You’ll notice that the casing boards slope slightly, typically thicker on one edge than the other. Cyclic Wind Pressure Loading Test (TAS 203, ASTM E1886/E1996, and ANSI A250.In new construction, one the most common types of doorway casing consists of three separate pieces: two long pieces for the sides of the door and one shorter piece (called “head casing”) for the top of the door.Uniform Static Air Pressure (TAS 202, ASTM E330, and ANSI A250.13).Steelcraft products are in accordance with ANSI/SDI A250.13 Testing and Rating of Severe Windstorm Resistant Components for Swinging Door Assemblies for Protection of Building Envelopes, the Florida Building Code (FBC) and the South Florida Building Code (SFBC). Steel hurricane-resistant assemblies can resist winds from 110 to 170 miles per hour. For example, a wind speed of 170 mph produces a design pressure of +49/-53 psf. Then they are rated with a “design pressure,” which is different than wind speed. These specialty door assemblies are tested with the positive and negative pressures that occur in hurricanes. Steelcraft offers a wide variety of hurricane certified doors and frames. In response, many coastal regions have adopted strict building code provisions intended to enhance the structural integrity of commercial buildings. The United States is increasingly struck by hurricanes that inflict loss of life and property damages in the billions of dollars. It is recommended to have a pre-installation meeting with the contractor, specifier, door supplier, and installer to discuss the installation. Proper installation of tornado doors is critical. ![]() These components include the frame, door, hinges, anchors, and latching hardware. Tornado assembly components are approved and certified as an assembly and cannot be mixed and matched.ICC 500 is the Standard for the Design and Construction of Storm Shelters.FEMA P-361 offers best practices on the design and construction of safe rooms but FEMA does not regulate construction.No wood door, with or without metal sheathing, has successfully passed FEMA P-361. Steel is the only readily available door material that passes the FEMA 361 and ICC 500 tornado test (250 mph wind speeds). There are more than 1,000 tornadoes in the United States each year, most of which can easily destroy standard doors. In areas where tornadoes or hurricanes occur, Steelcraft steel doors and frames are the safe choice.
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