{"id":3567,"date":"2026-10-21T19:11:56","date_gmt":"2026-10-21T11:11:56","guid":{"rendered":"http:\/\/www.mytets.com\/blog\/?p=3567"},"modified":"2026-10-21T19:11:56","modified_gmt":"2026-10-21T11:11:56","slug":"can-alum-beams-be-used-in-outdoor-structures-4854-cdb1ff","status":"publish","type":"post","link":"http:\/\/www.mytets.com\/blog\/2026\/10\/21\/can-alum-beams-be-used-in-outdoor-structures-4854-cdb1ff\/","title":{"rendered":"Can alum beams be used in outdoor structures?"},"content":{"rendered":"

Hey everyone, it\u2019s Jake from the team that supplies alum beams\u2014you know, the guys who\u2019ve got your structural needs covered for both indoor and big outdoor projects. Lately, I\u2019ve been fielding so many questions from contractors, landscapers, and even small business owners: \u201cCan alum beams actually hold up to outdoor stuff? Like, rain, snow, sun, that whole messy outdoor environment?\u201d Fair question\u2014way too many people write off alum beams as just for indoor warehouse setups or temporary stage rigs, but that\u2019s missing a huge part of the story. Today, let\u2019s break this down straight, no corporate jargon, just what I\u2019ve seen out on job sites over the last 8 years. Alum Beams<\/a><\/p>\n

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First, let\u2019s cut to the basics: alum (aluminum, for anyone who\u2019s still mixing up metals) is naturally a corrosion-resistant metal, right? It forms that thin, invisible oxide layer the second it hits air\u2014this super tough barrier that keeps moisture and stuff from eating through it. But here\u2019s the thing people forget: that oxide layer is only as strong as it stays intact. Outdoors, that layer can get scratched, chipped, or damaged during transport or installation, or even from harsh stuff like road salt near road-side structures or salt air near coasts. If that layer breaks, aluminum can corrode faster than you\u2019d think\u2014especially if it\u2019s sitting in a spot where rain doesn\u2019t drain, or mixed with other metals like steel fasteners (that\u2019s a big one, galvanic corrosion\u2014total buzzkill for outdoor structural parts).<\/p>\n

Wait, but that doesn\u2019t mean alum beams are off the table for outdoor use. Far from it. We supply alum beams for all kinds of outdoor projects that you\u2019d never even guess: over-cover decks for food carts at farmers\u2019 markets, temporary stage rigs for music festivals that stay up for 3+ months, even small retaining walls for residential landscaping that can\u2019t handle the weight of concrete. The key isn\u2019t just \u201ccan they be used outside\u201d \u2014 it\u2019s how you use them, and how you prep them for the elements.<\/p>\n

Let\u2019s talk about the pros first, because if you\u2019re weighing alum vs. steel or wood for an outdoor build, those pros matter a lot. First, weight. Alum beams are like 1\/3 the weight of steel beams with the same structural strength. That\u2019s a game-changer for outdoor projects where you don\u2019t want to deal with heavy machinery to lift 20-foot beams. For example, last year a crew in Miami was building outdoor concession stands for a beach park\u2014they couldn\u2019t get a crane to the spot without tearing up the grass, so they used 6-inch alum beams. The whole structure went up in half the time it would\u2019ve taken with steel, and they didn\u2019t have to pay for extra labor to move heavy materials. Win-win.<\/p>\n

Then, durability against the stuff that breaks other materials. Wood rots, splinters, and gets eaten by termites\u2014outdoor wood frames always need replacement every 10 years max. Steel rusts, dents, and needs constant painting to hold up outdoors. Alum? No rot, no termites, no rust\u2026 as long as you prep it right. I\u2019ve seen alum beams out in Arizona\u2019s desert heat (110\u00b0F+ days, dry wind) for 5 years, and they look almost new\u2014no fading, no warping. Near the coast in Florida, we supply treated alum beams that have a special powder-coat finish that blocks salt air, and those have been up for 7 years without a single rust spot.<\/p>\n

But let\u2019s be real\u2014no material is perfect, especially outdoors. The biggest con with alum beams for outdoor use is galvanic corrosion, which I mentioned earlier. That happens when two different metals touch in the presence of moisture\u2014like alum beams bolted to steel posts. The metal with the higher electrochemical potential (that\u2019s steel, in this case) will corrode way faster, and the alum beam will slowly eat away too. We\u2019ve had a couple of clients make that mistake early on\u2014they saved a few bucks on steel fasteners, and within a year, the beam was pitting so bad it couldn\u2019t hold the weight of the stage above it. Fixed that by switching to stainless steel fasteners or, even better, using alum fasteners, and the problem was gone.<\/p>\n

Another thing: scratch and impact damage. Alum is soft compared to steel, so if you\u2019re putting it in a spot where it\u2019ll get hit by equipment or dragged around, it can get dented. For most outdoor projects, that\u2019s manageable\u2014we just make sure to add a little extra thickness to the beams if they\u2019re in high-traffic areas. But if you\u2019re building something like a permanent outdoor structure that\u2019s going to take constant heavy hits, steel might be a better call. Though even then, we\u2019ve had a client build a outdoor barn frame with 10-inch alum beams, and it\u2019s held up to being hit by hay trailers for 6 years now\u2014just a few minor dents, no structural issues.<\/p>\n

Now, let\u2019s get into when alum beams actually make sense for outdoor structures. This is the part where I see people waste money on the wrong material. If your project checks any of these boxes, alum beams are worth a hard look:<\/p>\n

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  1. Temporary or semi-permanent structures<\/strong>: Stage rigs, event structures, pop-up retail covers, construction site hoardings that need to be taken down or moved within 5 years. Alum\u2019s lightweight and easy to disassemble, so you don\u2019t have to leave it up or haul super heavy stuff away.<\/li>\n
  2. Projects where weight is a factor<\/strong>: Backyard pergolas for homeowners who don\u2019t want to hire a crane, over-cover for small patios that sit on a deck, structures near soft ground (like sandy beaches) where heavy materials would sink.<\/li>\n
  3. Coastal or high-moisture areas<\/strong>: If you\u2019re within 1 mile of the ocean, or in a place that rains 8+ months a year, alum beats wood or steel every time. No termites, no rot, just regular maintenance (a quick wipe down with soapy water once a year) and it\u2019s good to go.<\/li>\n
  4. Projects that need to be code-compliant fast<\/strong>: Most building codes accept alum beams for outdoor structural use, as long as they\u2019re rated to the load you need. We keep all the load specs and code-compliance docs handy for every project, so you don\u2019t have to waste time waiting for inspections or struggling to meet local rules.<\/li>\n<\/ol>\n

    When should you skip alum beams for outdoor use? Let\u2019s be honest:<\/p>\n