Rebar 101: What You Need to Know - McCoy's Building Supply

Concrete cracks are one of the most common problems in construction. It's an unavoidable issue everyone has to deal with due to the properties of concrete. Although you can't prevent concrete cracks from occurring, there is a way to help reduce the chance of structural damage from cracks: rebar.

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Rebar, which stands for reinforcing bar, is a steel bar that is used to strengthen concrete. It is generally laid out in a specific pattern before or during a concrete pour to improve concrete tensile strength, which ultimately reduces the incidence of cracks. This reinforcing steel can be added to any concrete project, including floors, slabs, walls, and more.

Different Types of Rebar

These round steel bars come in sizes that vary in diameter, length, and grades used in diverse applications and projects. The roundness allows them to be easily cut. They can be bent into curves easily, enabling them to handle load stress better when compared to corners. It's also ribbed rather than smooth to ensure a better bond with the concrete.

Rebar is usually referred to by its industry size designation. For example, the first and more commonly used one is #3 rebar, which is 3/8 inches in diameter. The next designation is #4, which measures 1/2 inches in diameter. The diameter size increases .125 for each additional designation, all the way up to #18, which measures 2.257 inches in diameter.

Additionally, there are two grades — Grade 40 and Grade 60. The grade describes the yield strength or the amount of stress that can be handled before it starts to weaken. A higher grade means a higher strength. Grade 40 provides a minimum yield strength of 40,000 pounds, while Grade 60 provides a minimum yield strength of 60,000 pounds.

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The lengths it comes in are typically 20 feet, 40 feet, and 60 feet. However, you can always get it in a custom size — larger or smaller if you need it. If you're buying from a McCoy's store, you can talk to a store manager about getting custom cuts in #3 or #4 rebar.

Most home projects call for #3, #4, and #5 rebar. The #3 rebar works great with driveways and patios, while the #4 rebar works with walls and columns. The #5 rebar is used mainly for foundations and building footings. Commercial projects might require a larger size, but state and local building codes often determine what size to use.

How Is Rebar Made?

Rebar is produced by taking reclaimed scrap metal and placing it into a large container. Once it's collected, it's melted at very high temperatures and poured into a specific casting. Because it's made primarily of reclaimed scraped metal, it's an environmentally friendly product. McCoy's sources about 50-60% of its stock from US suppliers.

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