Photo: Maria Orlova

Can a tornado go through concrete?

Strong Tornado-Resistant Wall Systems In fact, a study published by the Portland Cement Association (PCA) found that concrete walls have more structural capacity and stiffness to withstand the in-plane shear forces of high winds than wood or steel framed walls.

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The Importance of Tornado-Resistant Home Design

Tornado-resistant construction is critical in the United States where an average of 1253 costly and deadly tornadoes occur annually. In 2017 alone, tornado outbreaks cost billions of dollars and resulted in 34 fatalities. One of the deadliest tornadoes in 2017 happened in southern Georgia and killed 11 people. Building a tornado-resistant house with Fox Blocks can protect a home and family from disastrous outcomes during a tornado emergency. A proper tornado-resistant design protects a home’s integrity and its occupants. The design must take into account the strength of the entire house, provide a continuous load path, and be impact resistant. FEMA, however, still highly recommends a safe room, or tornado shelter, for maximum safety to a home's occupants during a tornado emergency.

A Continuous Load Path for a Tornado Proof House

"Tornadoes have become more disastrous than hurricanes and earthquakes in North America. Having a home built with ICF walls solves that. Aside from that, when it comes to home renovations, contrary to what most people think, ICF homes are also easy to work with” - Chuck Waltman, Home Remodeler When the severe winds of a tornado try to rip a house apart, a continuous load path is the best defense towards holding the home together. The continuous load path ensures that when a load, including uplift and lateral (horizontal) loads, attacks a home, the load will travel from the roof, wall, and other elements toward the foundation and into the ground. In addition, the integrity of the walls, roof, and floor are critical to ensuring a strong continuous load path that will hold the home together during a dangerous tornado.

Strong Tornado-Resistant Wall Systems

Homes built with insulated concrete forms (ICF), like Fox Blocks, maintain their integrity during the high winds of a tornado. Insulating concrete forms can withstand winds of over 200 mph. In fact, a study published by the Portland Cement Association (PCA) found that concrete walls have more structural capacity and stiffness to withstand the in-plane shear forces of high winds than wood or steel framed walls. Also, the strength of concrete walls produces less lateral twists and damage to the non-structural elements of a house such as the electrical wiring and plumbing. Utilizing Fox Block ICFs for tornado-resistant construction can maintain a home's integrity during a strong tornado event.

Impact Resistant Wall Systems

Flying debris is a threat during tornadoes and can damage the exterior of a home and injure its occupants. ICF walls are a best practice for tornado-resistant wall construction. In fact, a study by Texas Tech University found that ICF walls resist damage from flying debris traveling over 100 mph while conventionally framed walls failed to stop the penetration of airborne hazards. Insulated concrete form walls are the best protection from windblown debris to a home and its occupants during a tornado event. An ideal choice for tornado-resistant wall construction is Fox Block ICFs. Fox Blocks contain thermal and structural features within a single, reinforced concrete wall section.

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Homes constructed with Fox Blocks maintain their integrity during intense tornado winds of over 200 mph.

Fox Blocks resist projectile debris traveling over 100 mph.

Fox Blocks also meet the thermal performance requirements of the IRC and IBC and exceed ASHRAE/ANSI 90.1 energy code requirements. The Fox Block Wall System has the strength to resist the heavy winds and flying debris of the most powerful tornadoes. Fox Blocks ICF is an excellent material choice when building a tornado-resistant house.

Durable, Tornado-Resistant Roof Construction

Building failures during tornado events often start with damage to the roof. First, the wind blows the shingles from the roof sheathing. Then, the roof sheathing rips from the roof framing. Finally, the roof framing pulls from the supporting walls. A tornado-resistant roof’s primary function in a continuous load path is as a horizontal diaphragm that moves the loads imposed by heavy winds to the supporting walls below. The roof sheathing is the first structural element in the load path between the roof system and the foundation. The sheathing works with the roof framing to transfer lateral loads to the home’s shear walls. Roof framing is the next building element of the load path. Sizing of the rafters of a roof’s frame must resist the weight of the roof system. The roof framing must also move the lateral loads to the shear walls below. It is essential in tornado-resistant roof design that the roof sheathing and framing are built and sized for the potential wind forces of the specific region.

Solid Tornado-Resistant Floor Construction

The floor system is the part of the continuous path that moves the loads to the shear walls in the stories below or the foundation. Floor framing often consists of dimensional lumber, or floor joists, spanning an open space. Floor joists must be sized to withstand the loads of the entire floor system along with vertical loads. The floor of a tornado-resistant home ensures the loads meet their final designation - the ground. A tornado-resistant design protects a home’s integrity and its occupants. Critical to tornado-resistant home design is a continuous load path, impact resistance, and strong roofs, walls, and floors. A safe room, or tornado shelter, is also highly recommended for the maximum safety of a home's residents during a tornado emergency.

foxblocks.com - Tornado Safe Homes: How ICF Construction Can Help Protect Your ...

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