Stability Comes from Quality Cast Parts

Is your dock actually built for long-lasting stability?

Many dock parts are stamped or extruded. The problem with these parts is that they tend to bend, slip, or break; this causes instability, especially with bottom plates and crossarm clamps. Alumi-Span uses cast parts, which don’t flex over time like stamped or extruded parts. Using cast parts for your dock eliminates a big instability issue.

Why the Lakebed Matters

The bottom of the post has to sit on something solid. On firm sand or gravel, a post can sit directly on the bottom plates. But on soft, mucky, or silty bottoms, you need more bearing surface. That's where permanent dock bases come in.

• Permanent augers screw into the bottom like a giant corkscrew, anchoring the post in place so it can't shift, even in soft sediment or current.
• Mud boards spread the post's weight over a wider footprint, so the post doesn't sink into soft bottom over time.

For a dock you plan to leave in year-round, an anchored base is worth the extra effort. For seasonal docks, a mud board or well-seated post can be plenty; the key is knowing what your bottom is made of before you set the first section.

Learn more in our latest article.

Need to Know how to Build a Boat Dock?

Alumi-Span has been building docks since 1956, and we sell everything down to the nuts and bolts, so you can upgrade your existing dock piece by piece instead of starting over.  

If you need instructions on how to build a boat dock, or if you’re just not sure what your dock needs, give us a call at 855-523-2444 or click here to submit a contact form — we’re more than happy to help you match the right parts to your dock.

Stability Starts Below the Deck

Does your dock feel loose or unstable?

Every dock section you walk on transfers its weight to a handful of support points: the posts. Those posts carry the load down to the lakebed, and the crossarms spread the load between them so no single post is doing all the work. When this system is sound, your dock stays level and doesn't bounce or sway underfoot. When it isn't, you feel it in every step — and over time, a wobbly dock puts stress on the connections and deck sections a
bove it.

The good news: you don't have to replace the whole dock to fix the problem. Most stability issues are solved at the support level.

Start with the Right Posts

Posts are the backbone of the dock, so size matters. Alumi-Span's standard is 2" OD aluminum dock posts, which they recommend for all new applications. They're lighter and last longer than the older 1.9" OD posts found on many existing docks. If you're building new, go with 2". If you're retrofitting an older dock, measure carefully before ordering, because the two sizes don't mix.

Aluminum posts are the best choice for a few reasons: they won't rot like wood, they resist corrosion better than steel, and they are lighter for pulling in and out season after season. Many Alumi-Span docks are still in service after more than 50 years, and that longevity starts with the posts.

Don't Forget the Crossarms

Posts hold the dock up, but crossarms and platform trusses hold the posts together. They tie adjacent posts into a rigid frame, which is what keeps the whole structure from racking or twisting when a wave hits or when someone steps on the edge of the deck. If your dock has always felt a little "loose," missing or undersized crossarms are often the culprit.

Learn more in our latest article.

Need to Know how to Build a Boat Dock?

Alumi-Span has been building docks since 1956, and we sell everything down to the nuts and bolts, so you can upgrade your existing dock piece by piece instead of starting over.  

If you need instructions on how to build a boat dock, or if you’re just not sure what your dock needs, give us a call at 855-523-2444 or click here to submit a contact form — we’re more than happy to help you match the right parts to your dock.

Make Your Dock Safe for Young Family Members

In our last blog, we talked about accessories that can help make your dock safer. Here are a few
additional safety tips to go with them:

1. Choose Non-Slip Decking for Foot Traffic

Children tend to sprint across a dock toward the water — and slippery surfaces can turn that excitement into a dangerous slip. Non-slip decking materials are essential:

• Vinyl and Aluminum Decking with textured treads keeps traction even when wet and bare feet are involved. 
• Hand-sorted Lumber deck boards reduce the risk of splinters. 

Whether you select premium wood, vinyl, or aluminum options, surfaces designed to shed water and provide traction help prevent falls.

2. Keep the Dock Well-Lit

Good lighting isn’t just for evening dock parties — it’s a safety essential. Dock lights help families spot changes in walking surfaces, avoid tripping hazards, and safely transit the dock at dusk or after dark. 

Solar LED lights or post cap lights are easy to install and low-maintenance.

3. Keep the Walkway Clear & Organized

A cluttered dock is a tripping hazard:

• Store ropes, life jackets, and water toys in designated bins.
• Mount paddleboard and kayak racks to keep walkways clear and free of clutter. 

Organized docking space makes it easier for kids to walk without unexpected obstacles.

4. Ensure Regular Maintenance

A safe dock isn’t a one-time project — it’s ongoing care. Regular checks help catch and fix:

• Loose boards
• Worn connections
• Mildew or algae buildup that can make surfaces slick 

Routine cleaning and seasonal maintenance keep your dock structurally sound and safe for kids.

5. Safety Gear Should Be Easy to Access

Even with the best dock design, accidents can happen:

• Keep child-sized life jackets near dock entrances so kids can easily grab them before stepping onto the dock. 
• Have first-aid kits nearby with supplies for minor cuts and scrapes. 

When safety gear is visible and accessible, family members are more likely to use it.

Read more in our latest article.

Complete Your Dock’s Safety-Check with Alumi-Span Boat Dock Parts

We design and build high-quality boat dock parts that make waterfront living safer and more enjoyable — especially when kids and family are involved.

Ready to design or upgrade your family-friendly dock? Explore our dock sections, bumpers, ladders, lighting, and more — and let’s make this summer safe and unforgettable!

Whether you’re ready to place an order or if you have questions, feel free to call 855-523-2444 or submit an online contact form here.

Boat Dock Parts for Safety

Your dock may be cleaned up and ready for spring, but is it safe?

A range of accessories can dramatically improve dock safety for young family members:

Dock Bumpers

Soft bumpers around edges cushion hard surfaces that kids might bump into or trip over, and also protect boats and dock edges. 

Stairs & Ladders

Easy-to-use stairs or ladders allow kids to enter and exit the water safely — far preferable to climbing on slippery rocks or jumping into deep water without support. 

Corner Sections

These eliminate gaps or edges where children might be tempted to jump, giving a smooth, safe transition around the end of your dock. 

Read more in our latest article.

Complete Your Dock’s Safety-Check with Alumi-Span Boat Dock Parts

We design and build high-quality boat dock parts that make waterfront living safer and more enjoyable — especially when kids and family are involved.

Ready to design or upgrade your family-friendly dock? Explore our dock sections, bumpers, ladders, lighting, and more — and let’s make this summer safe and unforgettable!

Whether you’re ready to place an order or if you have questions, feel free to call 855-523-2444 or submit an online contact form here.

Quality Still Comes First

2026 is Alumi-Span’s 70th year in business! 

One thing that makes us incredibly proud? You can still find 50- and 60-year-old Alumi-Span dock sections out in service today. They’ve weathered countless seasons and are often enjoyed by second and third generations of the same families.

Through all the years and all the changes, our values haven’t budged:

• Build things the right way
• Never cut corners
• Keep improving
• Offer honest, lasting value
• And always — always — make it in Michigan

Even today, the F-stringer style developed back in 1961 remains the most practical design for most inland docks. And Alumi-Span continues to lead the way in engineering and craftsmanship.

Looking Ahead

As we celebrate this anniversary, we’re filled with gratitude for the families who have trusted our docks, the marinas who have partnered with us, and the generations of Berlin and Hoover family members who poured their energy into making Alumi-Span what it is today.

Learn more in our latest article.

Learn How to Build a Boat Dock!

Ready to start building? 

If you need tips on how to build a boat dock, we’ve got you covered! Click here for our installation videos. If you have questions or you’re ready to place an order, don’t hesitate to reach out to us at 855-523-2444 or through our online contact form. We look forward to helping you build an amazing dock!

Where the Alumi-Span Story Begins

2026 marks Alumi-Span’s 70-year anniversary!

Our story starts in 1956 inside Metalloy Foundry, run by mechanical engineer and boating enthusiast Dick Berlin. Back then, docks were heavy, rusty, and made of steel or iron. Dick saw a better way. He created an all-aluminum dock system — lighter, cleaner, and stronger than anything on the market. In fact, some of those very first docks are still out on the water today.

The Breakthrough That Changed Everything

Just a few years later, in 1961, Dick introduced what would become a defining moment for the dock industry: the F-stringer aluminum dock section. By combining F-shaped side beams with interlocking aluminum boards, he created a dock that wasn’t just lighter — it was smarter, safer, and more affordable.

People took notice:

• Alcoa recognized it as one of the best new aluminum products of the year
• It appeared in over 20 industry publications
• And soon, over 200 marinas across the northern states were carrying it

Competitors tried to copy the idea, but the original Alumi-Span system set the bar.

Learn more in our latest article.

Learn How to Build a Boat Dock!

Ready to start building? 

If you need tips on how to build a boat dock, we’ve got you covered! Click here for our installation videos. If you have questions or you’re ready to place an order, don’t hesitate to reach out to us at 855-523-2444 or through our online contact form. We look forward to helping you build an amazing dock!

Winterization vs Removal

What’s the difference between winterizing a dock and removing it from the lake?

In short, winterization is for boat docks that are permanent and can withstand winter weather in the lake, and removal is for docks that aren’t permanent. Here’s a few tips for preparing for both situations.

If You’re Leaving the Dock in for Winter

Whether or not a dock can be left in depends mostly on the lake.  If your lake doesn’t get large ice flows, AND there are no regulations against it, a dock can be left in. Ice flows are what usually cause dock damage, rather than just plain freezing.

If you’re leaving your dock in, you “winterize” the dock. If that’s your plan:

• Remove accessories like lights, ladders, bumpers, and cleats to protect them from ice damage.
• Double-check that cables, anchors, and hardware are in good condition to prevent shifting or breakage.

If You’re Removing the Dock

If your lake gets large ice flows or there are regulations against leaving it in, the dock needs to come out for the winter. If that’s the case:

• Always remove leg sets from each section before storing.
• Number your leg sets so when you install your boat dock next spring, you’ll have minimal re-leveling to do—saving both time and effort.
• Store sections and parts in a secure place to protect.  If you decide to cover them to protect them from snow and ice, be sure there is air flow.  Don’t seal them in completely. 

Read more in our latest article.

Everything You Need to Install, Remove, and Winterize Your Boat Dock

Whether you have a question about installing, removing, or winterizing your dock, Alumi-Span is here to help! To get in touch, call (855) 523-2444 or submit a contact form here. We look forward to helping you make the most out of your boat dock!

Time to Start Planning for Fall!

How do you know when to start winterizing or removing your dock?

Here are a few tips on general timing, as well as regional recommendations!

Signs It’s Time to Start Planning

While every lake and river has its own seasonal rhythm, here are a few signs you should start thinking about dock removal or winterization:

• Water Temperatures Are Dropping. Cold water makes late-season work more uncomfortable and potentially unsafe.
• Weather is Becoming Unpredictable. Fall storms can bring wind, waves, and ice sooner than expected.
• End of Boating Season. Once you’re done with boats and personal watercraft for the year, your dock’s off-season prep can begin.

Regional Timing Recommendations

Your ideal timing will depend on your location. Here are a few examples:

• Northern Climates: Ice formation can start as early as October or November, so removal or winterization should happen before freezing conditions set in.
• Milder Regions: You may have more flexibility, but don’t wait until heavy winds or snow are in the forecast.
• Fluctuating Water Levels: If your area sees significant water level changes in the fall, factor that into your schedule to avoid working in unsafe conditions.

Read more in our latest article.

Everything You Need to Install, Remove, and Winterize Your Boat Dock

Whether you have a question about winterizing, removing, or installing your boat dock, Alumi-Span is here to help! To get in touch, call (855) 523-2444 or submit a contact form here. We look forward to helping you make the most out of your boat dock!

Getting Ready for Summer - Part 2

In our last blog, we talked about setting a budget and considering the usage of your future dock. This week, we’ll continue with design planning and shore considerations!

Plan for Maintenance and Looks

If you’d rather spend your weekends enjoying the water instead of sanding or staining wood, aluminum is the way to go. It’s virtually maintenance-free and built to withstand the elements. Prefer the look of wood? No problem—many aluminum docks now come in finishes that mimic the natural beauty of wood without the upkeep. Alumi-Span also offers real wood options.

Know Your Shoreline

Your dock should work with your lake, not against it. Things like shoreline type, lakebed conditions, seasonal water level changes, wave activity, and even prevailing winds all play a big role in determining the best dock design. A custom-fit dock ensures better performance, safety, and longevity.

Read more in our latest article.

Design Your Perfect Dock with Alumi-Span Parts

The layout of your dock matters. Sure, a simple rectangle gets the job done—but with the right plan, you can create something that truly fits your lifestyle. Whether you're into kayaking, hosting sunset dinners, or just lounging with a good book, the right design makes all the difference.

Let’s design your perfect dock—so you can spend more time enjoying the lake and less time worrying about upkeep. Call our dock experts today at 855-523-2444 or submit a contact form to get started!

Getting Ready for Summer - Part 1

Are you looking to build a boat dock?

Maybe you’re planning on upgrading your current dock?

Here are a couple things to think about before you get started:

Set Your Budget

Materials are often the biggest factor when it comes to cost. Aluminum docks might be a bit more expensive upfront than wood, but they more than make up for it in durability and low maintenance. They’re built to last—and they’ll save you time, effort, and money in the long run.

Think About How You’ll Use It

Will your dock just be a spot to tie up your boat, or do you want it to double as a hangout space? If you’re planning on relaxing, entertaining, or even fishing from your dock, aluminum is a great option. It’s lightweight, stays cool in the summer sun, and is easy to clean—perfect for a multifunctional setup.

Read more in our latest article.

Design Your Perfect Dock with Alumi-Span Parts

The layout of your dock matters. Sure, a simple rectangle gets the job done—but with the right plan, you can create something that truly fits your lifestyle. Whether you're into kayaking, hosting sunset dinners, or just lounging with a good book, the right design makes all the difference.

Let’s design your perfect dock—so you can spend more time enjoying the lake and less time worrying about upkeep. Call our dock experts today at 855-523-2444 or submit a contact form to get started!

Don't Be Scared to Install!

Are you feeling anxious about the idea of installing a boat dock by yourself?

Installing an Alumi-Span truss and platform system is a quick and efficient process—it only takes about 9 minutes to complete! You can follow along with this YouTube video of Alumi-Span team members installing a dock. 

Keep in mind that with a dock kit from Alumi-Span, you will have all of the hardware you need to build your dock right there in the package, so you won’t have to pause for any trips to the hardware store. Also, all of our hardware uses the same size, so you only need one wrench to complete the dock assembly.

By following the simple steps in our step-by-step guide, you can have a sturdy and reliable dock installed in no time, without having to pay a hefty labor price for a third-party installer!

Want to Learn How to Build a Boat Dock?

You can find both videos and paper instructions on how to build a boat dock on the Build Instructions page of our website!

If you’re ready to order dock parts, or even if you just have a question, you can contact Alumi-Span by calling 855-523-2444 or by submitting a contact form. We look forward to helping you achieve your custom boat dock!

Installing a Truss and Platform System - A Brief Overview

This month, we are sharing our quick step-by-step guide to installing a truss and platform system
dock. If you don’t have time to read the whole thing just yet, here’s a quick summary of the essentials: 

1. Understanding Alumi-Span Trusses

Alumi-Span offers pre-assembled trusses in standard lengths from 8' to 20'. Trusses have to horizontal poles with built in diagonal bracing, so there is no need for blind legs under the dock.  All adjustment can be made from the corners.  

There are two types of trusses:

• Regular Trusses – Feature a pole at each end.
• 90-Degree Trusses – Have one pole and clamps rotated 90 degrees for attachment to cross-arms to run a platform 90-degrees or perpendicular to an outgoing dock.

2. Key Installation Steps (Fast and Simple!)

A. Positioning the Truss Correctly

• Ensure the center casting (#310A) is on top with the “V” shape pointing upward for maximum strength.
• Use large bottom plates to simplify installation and stabilize the trusses.

B. Assembling the Dock Platform

• Bring sections out one at time and place on truss.
• Securely bolt deck sections together for a firm fit.
• Use black plastic platform connectors for added stability.

C. Properly Placing Stringer Brackets

• Position stringer brackets correctly to prevent trusses from sticking out beyond the dock sections.

D. Securing the Trusses

• Firmly clamp both upper and lower truss clamps before applying weight.
• To adjust the height, loosen and re-secure both clamps as needed.
• To raise center, leave top clamp tight, loosen and raise only bottom clamp

Want to Learn How to Build a Boat Dock?

You can find both videos and paper instructions on how to build a boat dock on the Build Instructions page of our website!

If you’re ready to order dock parts, or even if you just have a question, you can contact Alumi-Span by calling 855-523-2444 or by submitting a contact form. We look forward to helping you achieve your custom boat dock!

Anodized Aluminum Dock Rebuild Kit

Do you wish there was an all-in-one kit for rebuilding your boat dock? There actually is!

For a straightforward and efficient rebuild, consider the Anodized Aluminum Dock Rebuild Kit. This kit includes anodized interlocking deck boards, stainless steel fasteners, and detailed instructions. To complete the project, you'll need a 3/8” socket drive and a drill. Ensure your stringer opening measures just under 1-1/8”, a common size for 5/4” wooden deck boards. Stringers should be exactly 8 or 10 feet long. If your dock has different dimensions or if you have questions, our team can help! 

Why Choose Alumi-Span?

• Dock Rebuilders Few and Far Between: it’s very rare for a manufacturer to offer rebuilds. We take pride in offering this for our customers!
• Proven Durability: Many Alumi-Span docks have been in use for over 50 years.
• High-Quality Materials: Alumi-Span uses strong alloys and an acid-etched anodizing process that prevents the aluminum from turning black over time. The interlocking design, combined with stainless steel fasteners and tough adhesive, ensures a sturdy and squeak-free dock. 
• Made in America: Committed to quality craftsmanship, Alumi-Span products are proudly made in the USA. 

Read more in our latest article.

Check Out Our Guides for How to Build (or Rebuild) a Boat Dock!

If you’re not ready for an entirely new set up, rebuilding your dock revitalizes its appearance and enhances its durability, ensuring many more years of enjoyment on the water. To learn how to build a boat dock or to explore the full range of products, visit Alumi-Span's website or contact our team! Call 855-523-2444 or submit a contact form here.

Rebuild Options

Is your boat dock worn down, but not ready to be fully replaced?

If your dock has seen better days, Alumi-Span Docks can help restore its functionality and appearance. Our shop can:

• Replace worn out decking on current stringers Replace dock sections
• Assemble dock in-shop
• Send you the rebuilt pieces for self-assembly

For replacement decking, you have two options:

• Anodized Aluminum Decking: Upgrade your existing dock by replacing worn-out wooden sections with anodized aluminum decking. Alumi-Span's unique interlocking aluminum board design ensures a lightweight, splinter-free surface that's easy to clean and built to last. 
• Wooden Deck Panels: If you prefer the traditional look of wood, Alumi-Span offers treated pine and stained cedar panels to replace old sections, combining classic aesthetics with modern durability. 

Read more in our latest article.

Check Out Our Guides for How to Build (or Rebuild) a Boat Dock!

If you’re not ready for an entirely new set up, rebuilding your dock revitalizes its appearance and enhances its durability, ensuring many more years of enjoyment on the water. To learn how to build a boat dock or to explore the full range of products, visit Alumi-Span's website or contact our team! Call 855-523-2444 or submit a contact form here.

Things to Consider Before Building a Boat Dock

Have you been waiting for the right time to build your boat dock? There are a few things to take into consideration before you start!

Shorelines. What does the shoreline look like where you live? Grassy? A steep descent? Rocky? This will also influence the type of dock you construct.

Water Levels and Currents. Is there a lot of boat traffic and strong currents where you live? Do water levels fluctuate often? Consider the water level of your lake before you build.

Lake Bottom Sedimentation. Before you choose a dock style, consider the bottom of the water! Is it flat and sandy? Mucky? Research which dock types will suit the lake bottom best.

Laws & Ordinances. Some lakes have regulations on maximum dock length or rules about taking the docks out in winter.  Make sure to do your research and find out what is required by the lake, county, and state where you live.

Time for Maintenance. How much time do you have to perform yearly maintenance on your dock?  Are you able to spend time staining, etc. or do you need a dock that is maintenance free?

Wondering How to Build a Michigan Boat Dock?

Alumi-Span Docks offers both videos and installation guides to help you learn how to build a boat dock in Michigan. You can also buy all the dock parts you need straight from our website. Have questions? Call us at (855) 523-2444 or submit a contact form here.

Don’t Skip a Step when Planning Your Dock Design!

Building a new boat dock?

There’s a lot of planning involved in designing a dock. Luckily, we’ve got the information you need to consider before you buy materials. We’ve also got a custom dock design tool on our website to make the planning easier!

Before shopping, make sure you take the type to plan your design. Consider materials like wood, composite, or aluminum dock sections.

Other factors to keep in mind are:

• Location of your dock (will it be in the full sun, or shade?)
• Depth of water around the dock (do you need a railing?)
• Any local town or municipal coding requirements or permits needed
• Average number of boats that will be anchored to the dock
• What size is your dock?

Getting the size of your dock can be frustrating if you get it incorrect and have to measure several times, but you’re in luck! We’ve got our own dock design tool that you can use to get a quote!

Read the full article on our website!

Considerations for the Perfect Dock Design

Getting ready to install your boat dock? What about building a new one?

If you’re working on a boat dock, there’s a lot of planning involved.

Make the right choices with our expert guide! A boat dock design might seem really technical and complicated, but there aren’t too many differences between a boat dock and a backyard deck. If you’ve tackled that DIY project before, you’re probably already knowledgeable in the factors to build your own boat dock!

Read the full article on our website.

Experts at Alumi-Span Docks can help with Dock Design!

For nearly 60 years, Alumi-Span has provided entire dock systems and component parts for docks to property owners who want their docks to last. Need assistance selecting the right Alumi-Span products for your dock? Get in touch with us at 855-523-2444.

Our knowledge about boat docks can help you construct the perfect dock that will serve you for years. If you’ve tried other boat dock parts and were disappointed in their performance, it’s time to go with Alumi-Span. Contact us today!

What You Should Know About Building a Boat House Before You Start Construction

Do you need extra protection for your boat?

Have you considered adding on to your boat dock but you’re not sure where to start?

Building a boat house can be as complicated as building a home, and there’s a lot that boat owners should know before they get started. To make sure your boat house is the highest quality, safe, and durable, you need to consider several elements before getting started.

Read more on our website!

Family-Owned Alumi-Span Docks Has the Aluminum Boat Dock Parts You Need!

Every experienced boater needs a great boat dock, and Alumi-Span has the knowledge and expertise

Building a Boat Dock on a Lake? You Need to Read These Tips!

Do you have a boat dock that needs repairs, or property that needs a boat dock installed? 

Do you have questions about the type of boat dock that will work on your lake? If you’re building a DIY dock or just beginning to do research about types of boat docks, you want a professional to build and install. 

You need to read these tips! Check out our website for more!

Do you know what type of boat dock is right for your lake?

Have you recently purchased a lakefront property?

Do you have a cabin or lake house that needs a few upgrades?

A boat dock can make life at the lake so much more fun – from using it for swimming and sunbathing, to jet skiing and boating, this simple addition can add hours of fun for your friends and family.

Do you know what type of boat dock is right for your lake? Have you considered going DIY, or hiring a professional to help with the install and build?

Check out our tips for building a boat dock on your lake here.