6 Heavy Duty Shim Sets For Uneven Van Floor Installations

A van floor that looks flat to the eye often reveals its true, undulating colors the moment a rigid subfloor panel is laid down. Failing to address these hollow spots creates a hollow, echoing resonance that turns every step into a reminder of poor build quality. Selecting the right shim material is the difference between a rock-solid foundation and a vehicle that creaks with every mile.

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Wobble Wedges: Best for Micro-Adjustments

Wobble Wedges are the gold standard for those maddening, tiny variations found in factory van floors. Their flexible, tapered design allows for precise, hair-thin adjustments that prevent subfloors from rocking on minor contours. Because they are molded from high-impact plastic, they won’t rot, swell, or compress under the weight of cabinetry or heavy water tanks.

These are the go-to choice when the floor is mostly level but contains pesky “teeter-totter” points. They work exceptionally well because they stay exactly where they are placed, even when subjected to the persistent vibrations of road travel. If the goal is a silent floor and a perfectly level base for furniture, Wobble Wedges are the non-negotiable choice.

Nelson Composite Shims: Top All-Around Choice

Nelson Composite Shims strike a balance between structural strength and ease of use that few other materials manage. Unlike traditional wood shims, which can split or compress under point loads, these composite units offer consistent support across their entire surface area. They resist moisture and temperature fluctuations, making them ideal for the harsh, shifting climate inside a steel van shell.

These shims are recommended for builders who need a reliable, set-it-and-forget-it solution for both small gaps and larger structural voids. They provide enough surface area to distribute weight effectively, preventing the “crush” that often leads to squeaking floors over time. For the average van build, this is the most professional and forgiving option available.

EZ-Shim Interlocking Set: For Large Uneven Gaps

When a van floor has significant dips—often caused by factory floor corrugation or structural frame geometry—the EZ-Shim Interlocking Set becomes essential. These shims lock together to create a stable stack, preventing the sliding or shifting that often occurs with loose-laid shims. By creating a unified, stepped platform, they ensure a level surface even when the primary floor is deeply irregular.

These are best suited for situations where multiple layers of support are required to reach a specific elevation. Because they interlock, they act as a singular structural component rather than a pile of loose plastic. They are the clear winner for anyone dealing with severe floor deviations that require a more robust, layered approach to leveling.

Go-shims Plastic Shims: Best Budget Pick

Go-shims offer a straightforward, no-nonsense solution for those looking to keep a budget tight without sacrificing core functionality. These plastic wedges are durable enough to handle standard subfloor loads and come in a variety of sizes to fit different gap widths. They lack the bells and whistles of interlocking designs, but they perform the primary task of stabilization with absolute reliability.

These shims are perfect for builders who need to keep a high volume of materials on hand for varied, unpredictable gaps. While they require a bit more adhesive to keep them locked in place during the installation process, their cost-effectiveness is hard to beat. If the budget is a primary driver, these will get the job done just as well as premium alternatives.

PC Products PC-Plastic: Most Durable Option

PC Products PC-Plastic is in a league of its own when it comes to raw compressive strength. This is an epoxy-based moldable material, not a pre-cut wedge, which allows for a custom-fit shim exactly where the floor profile dictates. Once cured, it becomes harder than the surrounding subfloor, providing an impenetrable foundation that will never settle or compress.

This is the ultimate choice for critical stress points, such as where heavy batteries or full fresh water tanks sit on the subfloor. It eliminates the risk of “bottoming out” under heavy, static loads. If the priority is absolute structural integrity and longevity, skipping pre-manufactured wedges for this epoxy solution is the superior move.

BuildPro Tapered Shims: Easiest to Install

BuildPro Tapered Shims are designed for speed and alignment accuracy, making them a favorite for builders looking to wrap up floor work quickly. Their geometry is optimized for sliding into place and providing immediate, even contact between the subfloor and the metal chassis. They are lightweight, rigid, and require minimal effort to position correctly.

These are ideal for the novice builder or anyone struggling with the frustration of repetitive, time-consuming adjustments. Their consistent taper takes the guesswork out of the process, ensuring that the subfloor is uniformly supported across the entire surface. They offer the most user-friendly experience for those who want a professional result without the technical headache.

Do You Actually Need to Shim Your Van Floor?

It is a common mistake to assume that a thick, rigid subfloor panel like plywood will bridge all gaps on its own. While plywood has structural strength, it will eventually conform to the metal floor underneath if gaps are present, leading to “flex” and the inevitable creaking sounds that plague poorly finished vans. Shimming is not about leveling the entire van; it is about providing a full-contact base for the subfloor.

If the subfloor is placed directly onto an uneven metal floor, those empty voids act as acoustic chambers. Every footfall amplifies the sound, turning the cabin into a drum. By filling these voids with shims, the floor becomes a solid, deadened surface that feels premium underfoot and stands up to the rigors of van life.

How to Map High and Low Spots on Your Floor

Mapping a floor is best done with a long, rigid straightedge or a simple laser level. Place the straightedge across different sections of the van floor and slide a tape measure or a thin shim into the gaps that appear between the metal and the tool. Mark these locations directly on the floor with a permanent marker to create a clear visual map of where support is needed.

Pay special attention to the areas around the wheel wells and the center corrugation of the van. These are the most common locations for structural irregularities. Taking ten minutes to mark the floor before laying down any insulation or subfloor will save hours of rework once the installation begins.

Shims vs. Self-Leveling Compound: A Showdown

Self-leveling compound is a common choice in home construction, but it is rarely the right fit for a moving vehicle. The constant vibration, twisting, and thermal expansion of a metal van chassis will cause rigid compounds to crack, crumble, and eventually turn into a pile of abrasive dust. Shims, especially high-density plastic versions, move with the vehicle and maintain their structural integrity over time.

Shims are a mechanical solution to a mechanical problem. They provide discrete, targeted support exactly where it is needed without adding unnecessary weight to the vehicle. While compounds sound convenient, the durability of shims makes them the only logical choice for an environment that is constantly in motion.

Installing Shims Without Squeaks or Movement

The secret to a silent floor lies in the bond between the shim and the surfaces it touches. Before placing any shim, clean the metal floor thoroughly to ensure no grease or debris interferes with the adhesive. Use a high-quality construction adhesive or a bead of silicone to lock each shim into position, preventing it from migrating over time.

Once the adhesive is applied and the shim is in place, test for movement before moving on to the next section. If a shim feels loose, adjust it immediately rather than hoping the subfloor weight will hold it steady. A well-bonded shim is a permanent part of the floor structure; a loose shim is simply a future source of noise.

A well-shimmed subfloor is the foundation of a successful build, transforming a cold, echoing steel box into a comfortable living space. Investing time and the right materials into this hidden layer prevents long-term headaches and ensures the interior remains quiet and durable for years of travel.