We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Dead Load?

Mary McMahon
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A dead load is the constant weight of a structure, including the structure itself, along with fixtures intended to be permanent. When structures are designed, the architect must make dead load calculations to ensure that the structure can support itself. In addition, the weight of variable live loads that change or move over the life of the structure must also be considered. Failure to account properly for the loads a structure will endure can result in collapses and other problems.

Calculating a dead load can be difficult because the final weight of a structure may not be known until it is completed. Architects and engineers use standardized information and estimates about known building materials to calculate as closely as possible. Design software often includes features that are designed to assist with estimating dead loads, allowing people to input known specifications and returning values. It is important to be aware that adjustments made to accommodate the dead load cause it to change. For example, if an engineer determines that a bridge needs bigger girders, this will add to the load.

The dead load does not change over the life of the structure. It neither increases nor decreases and does not shift or move over time. By contrast, live loads are flexible and they will change over time. They also impact structures in different ways, in addition to weighing down the structure, they also strain it as they move around. Cars moving across a bridge are an example of a live load.

Anything that is permanently affixed to a structure is part of the dead load. In a structure like a hospital, for example, the dead load would include the building itself, along with medical imaging devices that are bolted down or otherwise fixed, fixed cabinetry, and similar objects. By contrast, the hospital beds, portable medical equipment, and other movable objects in the hospital would be part of the live load, as would personnel, patients, and visitors.

Structural design requires developing buildings that are strong and flexible enough to handle the combined dead and live loads. Buildings are usually required to exceed estimated capacities to reduce the risk of errors. Engineers must also consider sources of stress, like high wind and earthquakes that can also generate a load and lead to compromises to the structural integrity. In the case of older structures not designed with these issues in mind, retrofitting may be performed to address design shortcomings and make the structures safe for modern use.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a About Mechanics researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments

By jonrss — On Jul 08, 2011

Here is a question for the engineers and architects out there. How do you calculate the load that the environment places on a structure and is this considered a dead load or a live load?

Here is what I mean. Say you have a bridge. It is going to get hit by a certain wind load though its entire life. In the event of a heavy storm this could be significant. If you have a tall building it will also get hit with wind and its rood will collects rain and snow. All of these factors place a strain on a structure that engineers must have to account for. How do they do this, how can you predict the wind? I'm really hoping someone can pick this question up because it really baffles me.

By ZsaZsa56 — On Jul 07, 2011

I have worked as an engineer for a number of years and I can tell you how valuable dead load calculators are.

This is still a relatively new technology. We didn't have anything like this until computers came along and even then the calculators didn't get really accurate and useful until about 10 years ago. They have taken a previously labor intensive and extremely tedious job and made them into pretty quick work. Just another example of how computers have revolutionized science in the last 30 years.

By chivebasil — On Jul 06, 2011

This article reminds me of a story I heard about as a kid that has always stuck in my mind for some reason. In Kansas City where I grew up there is a huge mansion on top of a hill that was owned by a lumber magnate.

According to my dad, this rich man insisted on having a swimming pool built on the third floor of his house in a room made entirely of windows. His big dream was to be able to swim and look out and down on the city.

But apparently the architects and engineers made a miscalculation and when the pool was filled for the first time it broke away and crashed all the way through the center of the house. No one was hurt but obviously the house was trashed.

That story always makes me giggle just because its nice when you hear about a super rich person getting some retribution for all their silly decisions.

Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.