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 of 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.

In Construction, what is a Trimmer?

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 trimmer or trimmer stud is a component of a framed structure that provides additional support for an opening such as a door or window. Trimmers are needed to ensure that the structure remains stable and retains its structural integrity despite the creation of openings, because openings can create weak points in a structure. These structural members are usually required under the building code and a contractor may opt to exceed the needs of the code by using a larger size than called for if it appears necessary.

In a basic framed wall, a series of studs run the length of the wall, connecting with the floor and roof joists. A network is created to distribute the weight of the structure, ensuring that no hot spots develop where structural members are called upon to support disproportionate amounts of weight. As soon as an opening is created, it disrupts the arrangement of studs and can make the structure weaker, vulnerable to high winds, earthquakes, and other problems.

Trimmer studs, along with other supportive members like king studs, distribute the weight of the structure above the opening around the opening, ensuring that it dissipates evenly through the floor. This reduces the strain on the wall created by the opening. It also reduces the risk that the wall will fall out of plumb, potentially making it hard to open and close the door or window.

A trimmer can be made from wood or metal, depending on the structure. It is built into the framing around the opening and can be installed in several different ways. It is possible to install separate trimmers to support the header and the sill, and this may be done for structural integrity and to make it easier to replace or repair the sill. A contractor can make a decision about which trimmer layout would be best to use on the basis of the structure, the architectural plans, and other factors, like the likelihood that windows will be moved or replaced.

With some framed structures, the framing may be done flat on the ground, with the framing being raised when it is finished. This technique can be easier, especially for people working on small crews, than trying to frame upright. As the structure is built and the roof supports are installed, it will become increasingly sturdy and the structural supports installed to hold the framing up during construction can gradually be taken away.

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 Oceana — On Oct 31, 2011

I don't have much sense when it comes to building things, but I can see the need for a trimmer now. For all my life, I have never once considered what keeps a house from collapsing over windows and doors. Now that I think about it, certain types of openings would need extra strong trimmers.

If you had those big bay windows that cover half a wall and sometimes extend almost all the way to the floor, you would really need to provide extra support around the frame. This could be a really vulnerable area when strong winds whip through the yard.

The same thing would apply to sliding glass doors. They cover such a wide area, and a trimmer would help support the weight of the house over the glass.

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.