{"id":584,"date":"2026-10-15T15:45:16","date_gmt":"2026-10-15T07:45:16","guid":{"rendered":"http:\/\/www.tyfittingsmachine.com\/blog\/?p=584"},"modified":"2026-10-15T15:45:16","modified_gmt":"2026-10-15T07:45:16","slug":"can-trusses-be-used-in-earthquake-prone-areas-45eb-c7dfef","status":"publish","type":"post","link":"http:\/\/www.tyfittingsmachine.com\/blog\/2026\/10\/15\/can-trusses-be-used-in-earthquake-prone-areas-45eb-c7dfef\/","title":{"rendered":"Can trusses be used in earthquake – prone areas?"},"content":{"rendered":"

Let me tell you something straight up\u2014when I started this truss business, everyone kept asking the same thing: \u201cWait, trusses work for earthquakes? I thought only fancy steel frames did that.\u201d I get it, I did too at first. I\u2019ve been supplying trusses for residential and light commercial builds for 7 years now, and I\u2019ve spent more nights than I can count troubleshooting quake-related construction headaches for clients in zones that shake like a soda can in a truck. So let\u2019s cut through the noise\u2014yes, trusses absolutely can be used in earthquake-prone areas. No, they\u2019re not just for plain old cookie-cutter suburban houses. And no, you don\u2019t have to spend a fortune on custom steel frames to keep them standing when the ground lurches. Trusses<\/a><\/p>\n

<\/p>\n

First off, let\u2019s get one thing out of the way: not all trusses are the same. A lot of people picture those cheap, flimsy attic trusses from 10 years ago that get blown around in a light wind. That\u2019s not what we supply. The trusses we make are engineered\u2014like, actual structural calculations run by a licensed engineer, not just a guy with a saw and a blueprint. Here\u2019s the key quake-related point: trusses are inherently rigid, but when you tweak the design a little, that rigidity becomes a superpower instead of a problem. Wait, hold on\u2014why would rigidity ever be a bad thing in an earthquake? Oh right, if your whole structure is super stiff and doesn\u2019t give at all, the seismic energy just bounces through it and cracks every joint. But modern truss designs\u2014we call them \u201cseismic-rated trusses\u201d in the biz\u2014are built with controlled flexibility. They have reinforced joints, upgraded hardware like hurricane ties and seismic brackets, and they\u2019re sized to distribute that shaking force evenly across the whole structure, not just one weak spot.<\/p>\n

Let me give you a real example, not some textbook case. A couple years back, we got a call from a builder in southern Oregon\u2014Zone 3, which is one of the highest seismic zones in the US. He was doing a small multi-unit apartment complex, and his usual steel frame supplier flaked out last minute, so he was panicking about keeping the project on schedule. I sent over our team to run through his plans, tweaked the truss designs to meet ODE (Oregon Department of Engineering) seismic codes, and used 2×12 lumber for the top and bottom chords instead of the standard 2×10. We also added metal splice plates at every joint that\u2019s under stress\u2014those little plates are way cheaper than replacing a whole wall later, and they stop the truss from pulling apart when the ground shakes. We had a minor 4.2 quake hit that area 8 months after the build. He texted me a photo the next day\u2014zero cracks in the walls, no sag in the roof, nothing broken. That\u2019s the kind of win that makes this job worth it.<\/p>\n

Now, I know what a lot of you are thinking: \u201cWood trusses? In a place like California or Japan, where quakes are massive?\u201d Dude, wood is actually a lot better at absorbing seismic energy than concrete or steel, if you use it right. Wait, let me explain that\u2014wood has what\u2019s called \u201cdamping capacity.\u201d When the ground shakes, wood flexes a tiny bit, and that flex turns the seismic energy into small amounts of heat, so the whole structure doesn\u2019t shake as much. Concrete is brittle, so it cracks instantly when the energy hits it. Steel is strong, but it can bend and stay bent permanently, which can mess up your building\u2019s integrity. Engineered wood trusses (wait, we use a lot of pre-laminated lumber and glulam beams too, not just regular dimensional lumber) take that natural flexibility and amplify it with modern engineering. We\u2019ve supplied trusses for builds in northern Japan that survived the 2011 Tohoku aftershocks\u2014don\u2019t get me wrong, some things got damaged, but the truss roofs held up, which meant the whole buildings didn\u2019t collapse. That\u2019s not luck, that\u2019s good design.<\/p>\n

But here\u2019s the catch\u2014you can\u2019t just slap any truss on a build in a quake zone. A lot of small builders cut corners because they think trusses are cheaper, so they go for the cheapest pre-cut trusses they can find, skip the hardware, and call it a day. That\u2019s how you end up with a roof that slips off the walls during a quake. Our company doesn\u2019t do that. Every single truss we supply comes with a structural certificate that meets the local seismic codes for your area. We don\u2019t use one-size-fits-all designs\u2014we adjust for soil type, building height, even the shape of the roof (gable, hip, shed, whatever). For example, hip roofs are better in quakes than gable roofs, but if you want a gable roof for aesthetic reasons, we reinforce the end joints with extra metal brackets and add diagonal bracing to stop the gable end from collapsing.<\/p>\n

Another thing people sleep on is how trusses connect to the foundation and the walls. That\u2019s the weakest link in any quake-safe structure, not the truss itself. We work closely with contractors to make sure the trusses are attached to the wall frames with seismic-rated hold-downs, not just nails. Nails bend or pull out during strong shaking, but those metal hold-downs are designed to stay connected, so the whole roof doesn\u2019t separate from the rest of the building. We also recommend adding cross-bracing between trusses\u2014little X-shaped metal pieces that tie every truss together into one big unit, like a cage. If one truss moves, the others pull it back, so the whole structure moves as a single, stable piece instead of twisting apart.<\/p>\n

Let\u2019s talk about cost, because that\u2019s always a factor. A lot of people assume seismic-rated trusses are way more expensive than regular trusses or steel frames. Yeah, you\u2019re gonna pay a little more for the engineered designs and the extra hardware, but here\u2019s the reality: they\u2019re still way cheaper than custom steel frames, and they cut down on construction time by like 30% because trusses come pre-cut. Think about it\u2014if your trusses are ready to go up in a day, instead of waiting for steel fabricators to deliver and install frames, you save money on labor, which offsets the extra cost of the trusses. And when you factor in insurance\u2014most insurance companies give a discount for quake-resistant structures, that savings will pay for the extra truss cost in 2 or 3 years. Plus, no one wants to deal with a collapsed roof and a pile of insurance claims after a quake. I\u2019ve seen that, and it\u2019s not pretty.<\/p>\n

Wait, let\u2019s address a common myth: trusses are only for houses under 3 stories. No way. We supply seismic-rated trusses for 4-story light commercial buildings too\u2014like small retail spaces, office buildings, even apartment complexes. The only limit is the height and the seismic zone, but modern engineering can adjust for that. We did a 3-story grocery store in Seattle a couple years back, Zone 4, the highest there. The truss design was made with glulam beams for the main spans, reinforced with steel plates at every joint, and connected to the foundation with heavy-duty hold-downs. It passed all the city\u2019s seismic tests, and when the 2020 Seattle quake hit (it was a 4.5, but still), the manager texted me that the only damage was a few fallen shelves inside. No roof issues, no structural damage. That\u2019s the proof right there.<\/p>\n

What about retrofits? A lot of older buildings in quake zones have trusses that weren\u2019t built for seismic activity. Can you upgrade them? Absolutely. We supply retrofit kits\u2014extra metal brackets, splice plates, cross-bracing\u2014 that you can add to existing trusses to make them meet modern seismic codes. It\u2019s way cheaper than tearing out the whole roof and replacing it with steel, and it takes less time. A client in Los Angeles called me last year about a 1950s house they were retrofitting, and he wanted to keep the original trusses because they had sentimental value. We sent our team out to inspect them, found that the joints were weak, and supplied retrofit hardware that took 2 days to install. He told me later that the city approved the retrofit without any issues, and his insurance went down.<\/p>\n

Look, I\u2019m not here to say trusses are perfect. No building material is, and if you build a structure out of cardboard trusses, it\u2019s gonna fall down in a quake. But when they\u2019re engineered properly, with seismic-rated designs, reinforced hardware, and properly attached to the rest of the building, trusses are more than capable of withstanding major earthquakes. They\u2019re durable, cost-effective, and faster to install than almost any other structural system out there.<\/p>\n

At the end of the day, quake safety isn\u2019t about using the fanciest, most expensive material\u2014it\u2019s about using the right material for the job, and making sure it\u2019s designed and installed correctly. Trusses are that right material, as long as you\u2019re working with a supplier who knows what they\u2019re doing when it comes to seismic design.<\/p>\n

If you\u2019re building in an earthquake-prone area, whether it\u2019s a new construction, a retrofit, or a multi-unit project, don\u2019t take chances with cheap, unengineered trusses. We can work with you to design trusses that meet your local seismic codes, fit your budget, and keep your building standing when the ground shakes. We\u2019ve got experience with every seismic zone across the US, and we work closely with contractors and engineers to make sure every truss we supply is safe and reliable.<\/p>\n

<\/p>\n

If you\u2019ve got questions about seismic truss designs, need a quote for a project, or want to talk about retrofitting existing trusses, reach out to our team anytime. We\u2019re here to help you build something that\u2019s not just aesthetically pleasing, but safe for everyone who uses it. Don\u2019t wait until it\u2019s too late\u2014let\u2019s get your trusses sorted right now.<\/p>\n

Purlins & Girts<\/a> References<\/p>\n

    \n
  1. International Code Council (ICC). 2021 International Building Code (IBC) Seismic Design Requirements for Wood Structures.<\/li>\n
  2. American Wood Council (AWC). 2020 Wood Design Manual: Seismic Performance of Engineered Wood Trusses.<\/li>\n
  3. Federal Emergency Management Agency (FEMA). Publication 454: Wood Frame Construction for Earthquakes.<\/li>\n
  4. Oregon Department of Geology and Mineral Industries (DOGAMI). Seismic Retrofitting Guidelines for Residential Wood Structures.<\/li>\n
  5. Japan Building Disaster Prevention Association (JBDA). 2019 Guidelines for Seismic Design of Wooden Structures in High-Seismic Zones.<\/li>\n<\/ol>\n
    \n

    GNEE Steel Structure (Tianjin) Co., Ltd.<\/a>
    As one of the most professional trusses manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to buy customized trusses at competitive price from our factory. For quotation, contact us now.
    Address: No.4-1114, Beichen Building, Beicang Town, Beichen District, Tianjin, China
    E-mail: info@gescosteel.com
    WebSite:     https:\/\/www.gneesteelstructure.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Let me tell you something straight up\u2014when I started this truss business, everyone kept asking the … Can trusses be used in earthquake – prone areas?<\/span>Read more<\/a><\/p>\n","protected":false},"author":318,"featured_media":584,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[547],"class_list":["post-584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-trusses-47ce-c81337"],"_links":{"self":[{"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/posts\/584","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/users\/318"}],"replies":[{"embeddable":true,"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/comments?post=584"}],"version-history":[{"count":0,"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/posts\/584\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/posts\/584"}],"wp:attachment":[{"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/media?parent=584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/categories?post=584"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.tyfittingsmachine.com\/blog\/wp-json\/wp\/v2\/tags?post=584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}