Roofing is more than just shingles and materials; it’s about the sturdy structure that keeps everything in place. If you’ve ever wondered about the weight of steel in roofing, you’re not alone.

In this blog, we’ll keep it simple and break down how many kilograms of steel are typically used in 1 square foot of roofing. We’ll use examples and everyday language to make this concept crystal clear.

1. Understanding Roofing Steel:

Before we dive into the numbers, let’s get a basic understanding of roofing steel. Steel is like the backbone of many roofs, providing strength and durability. It’s commonly used in roof trusses, which are the framework that supports the roof’s weight.

2. The Thickness Matters:

The weight of steel used in roofing depends on its thickness, often measured in gauges. The higher the gauge number, the thinner the steel. For roofing, gauges typically range from 22 to 29, with 22 gauge being thicker and stronger than 29 gauge.

3. Calculating Steel Weight:

To calculate how many kilograms of steel are in 1 square foot of roofing, we’ll need to consider the thickness and dimensions of the steel used. Let’s break it down with an example:

  • Thickness (Gauge) = 24 (a common gauge for roofing)
  • Area of 1 Square Foot = 1 sq ft

4. Using Steel Density:

Now, we need to find the density of steel, which is typically around 7850 kilograms per cubic meter (kg/m³). To find the weight of steel in 1 square foot, we’ll need to convert square feet to square meters. There are approximately 0.0929 square meters in 1 square foot.

5. The Formula:

To calculate the weight of steel in 1 square foot, we use the formula:

  • Weight (kg) = Thickness (in meters) x Area (in square meters) x Steel Density

6. Example Calculation:

  • Thickness (in meters) = 24 gauge = 0.701 mm (approximately)
  • Area (in square meters) = 0.0929 sq m (1 sq ft converted)
  • Steel Density = 7850 kg/m³
  • Weight (kg) = 0.000701 m x 0.0929 sq m x 7850 kg/m³ ≈ 5.45 kg

So, approximately 5.45 kilograms of steel are used in 1 square foot of roofing with 24-gauge steel.


Understanding the weight of steel in roofing helps you appreciate the strength and durability it adds to your home’s structure. It’s like the sturdy bones that support the roof’s weight and ensure its longevity.

Roofing steel calculations are like the nuts and bolts of your roof’s structure, quietly doing their job above your head. Knowing how much steel is used in 1 square foot is a valuable insight, allowing you to make informed decisions when it comes to roofing projects.


As a civil engineer and roofer, I love to share the experience that I have gained through the last couple of years. In the roofing industry, practical experience is a very crucial fact that can help you a lot. Hence, I want to help you with my blog.

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