6 Best Door Shims For Leveling Rv Entryways For Diyers

Nothing ruins the peace of a remote campsite faster than a RV door that refuses to latch, drags on the frame, or lets in a constant whistle of wind. Precision alignment is the difference between a secure, weather-tight entrance and a frustrating daily battle with hardware that never quite sits right. Selecting the right shim is the most effective way to address those persistent frame-racking issues that plague mobile living.

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Nelson Wood Shims: The Classic Choice

Nelson wood shims are the gold standard for those who prefer working with traditional materials. Their tapered design allows for fine-tuned adjustments, making them ideal for doors that have shifted due to frame settling or heavy road vibration. Because they are made of soft wood, they can be easily trimmed with a simple utility knife once the door is properly plumbed.

These shims excel in scenarios where there is a significant gap to bridge or when you need to compress the material slightly to ensure a snug fit. While they don’t offer the moisture resistance of plastic alternatives, they are inherently stable and hold screws exceptionally well. If the goal is a permanent, traditional fix that allows for a bit of “give” during installation, these are the reliable choice.

Choose these if you are comfortable with basic wood-working tools and need a shim that will stay put once fastened. They are not the best fit for extremely high-moisture environments unless properly sealed, but for interior or well-protected door frames, their performance is unmatched.

Wobble Wedges: Best for Tight Uneven Gaps

Wobble Wedges are the problem-solvers for those frustratingly small, irregular gaps that standard shims simply cannot accommodate. Their unique stepped design allows for precise, incremental height adjustments without the need for trimming. This makes them perfect for leveling an RV door that is only slightly off-kilter but refuses to close smoothly.

The material is a rigid, high-impact plastic that won’t compress or rot over time. Because they are stackable and feature an interlocking texture, they stay in place during the installation process, preventing the “sliding” frustration common with wood shims. They are particularly effective when you are working alone and need to hold the door in position while fastening the hinges.

These are an absolute essential for any RV toolkit. Use them when you are dealing with tight tolerances and need a solution that won’t warp or degrade due to road moisture. They are the clear winner for precise, set-it-and-forget-it adjustments.

EZ-Shim Composite Shims: The Easiest for DIYers

EZ-Shim Composite Shims are designed with the modern DIYer in mind, prioritizing speed and structural integrity. These shims are made from a high-density, waterproof material that will not split, crack, or compress, no matter how much weight the door frame bears. Their snap-off design means you can achieve a flush finish without needing a saw or heavy-duty cutting tools.

What sets these apart is the uniform thickness, which takes the guesswork out of leveling. They provide a rock-solid foundation for door hinges, ensuring that the heavy weight of an RV door doesn’t cause the shim to flatten over thousands of miles of travel. They are essentially the “set it and level it” solution for those who want a professional result without the fuss.

If you value efficiency and want a material that is immune to the humidity fluctuations common in RV life, these are the go-to. They are a must-have for anyone looking to eliminate the maintenance of wooden shims.

Builder’s Best Plastic Shims: Best Bulk Value

When a project requires shimming an entire entry frame or multiple doors, Builder’s Best Plastic Shims offer the best cost-to-performance ratio. These are standard-issue for contractors because they offer consistent thickness and a durable, rot-proof material that stands up to the rigors of an RV frame. They come in bulk packs, ensuring you never run out mid-job.

While they may not offer the advanced locking features of high-end wedges, their simplicity is their strength. They are easy to stack and can be snapped to length with minimal effort. Their durability ensures that once the door is aligned, the frame remains stable even after being subjected to the constant twisting and flexing of a vehicle in motion.

These are the right choice for the DIYer who has a larger project and wants to stock up without overspending. They are basic, effective, and reliable. Keep a pack in the workshop for whenever frame alignment becomes a headache.

Go-Ez Wedges: Most Versatile Plastic Shim

Go-Ez Wedges stand out for their flexibility in various orientations. Unlike traditional shims that only move in one direction, these wedges can be used as singles or stacked in opposing directions to create a parallel lifting surface. This makes them incredibly useful for doors that are out of square in complex, non-linear ways.

The plastic material is durable enough to hold heavy load-bearing points without deforming. They are specifically designed for gaps that aren’t perfectly square, making them the ultimate tool for older RVs or trailers that have seen significant wear and tear. Their non-slip grip keeps them in place while you confirm your measurements.

If your RV door frame has seen better days and presents a challenge that standard rectangular shims can’t fix, reach for these. They provide the versatility required to handle non-standard door geometries with ease.

DIY Hardwood Shims: The Ultimate Custom Fit

For those who view DIY as a craft, carving custom hardwood shims from scraps of oak or maple remains the ultimate solution. Hardwood offers superior compressive strength compared to soft pine or plastic, ensuring that your heavy RV door hinges remain perfectly aligned for years. It is a labor-intensive approach, but it allows for a bespoke fit that conforms perfectly to the specific contour of your door jamb.

To make these, select a dense, kiln-dried hardwood that won’t shrink or swell as the temperature inside the RV changes. By planing a thin taper, you create a shim that matches the exact angle of your frame distortion. This creates a solid, high-friction contact patch that won’t slide under pressure.

Use this method only if you have access to a plane or a belt sander and enjoy a custom, high-durability fix. While it takes longer, the structural benefit of a perfectly fitted hardwood shim is unparalleled for heavy, high-traffic doors.

Wood vs. Plastic: Picking Your Shim Material

Choosing between wood and plastic is primarily a question of environment and intended lifespan. Wood shims are excellent for their ability to be compressed, which creates a slight friction lock against the frame. However, wood is susceptible to moisture, which is the primary enemy of any RV frame; if your door area experiences condensation or seal leaks, wood will eventually rot.

Plastic shims, by contrast, are impervious to moisture, making them the superior choice for exterior door frames that are constantly exposed to the elements. They offer consistent thickness and are less likely to split under the weight of heavy hinges. The trade-off is that plastic can sometimes be slicker, requiring a more deliberate approach to securing them with adhesive or mechanical fasteners.

Base the decision on where the door is located. Interior bathroom or pantry doors in an RV are fine with wood, but entry doors, which face constant temperature swings and moisture infiltration, should almost always be shimmed with high-density plastic.

How to Properly Shim an RV Entry Door

Begin by removing the door and checking the frame with a long, accurate level. If the frame is sagging, identify the specific corners that need lift, rather than just forcing the door to fit the existing opening. Insert shims behind the hinge side of the frame, starting from the bottom and working upward, ensuring the frame remains plumb and square.

Always secure the shims with a dab of construction adhesive or a light brad nail through the shim and into the wall stud. Never rely on the door’s weight to hold the shims in place, as the vibration of travel will eventually dislodge them. Once the frame is solid, hang the door and check for a consistent gap around the entire perimeter.

If the door binds in one area, resist the urge to over-shim the opposite corner; instead, adjust the existing shims to nudge the frame into the proper geometry. Patience at this stage prevents the “door-pop” that occurs when an RV frame flexes on a campsite.

Common Shimming Mistakes RVers Make

The most frequent error is over-shimming to compensate for a sagging door instead of addressing the source of the sag. If the door frame itself is failing, shimming it only puts more stress on the fasteners; ensure the underlying wall structure is sound before attempting to shim. Another common mistake is failing to secure the shim, which will eventually drift inward or outward as the RV rolls down the highway.

Avoid using too many thin shims stacked on top of one another, as this creates a “nest” that can compress over time, leading to a recurring alignment issue. It is always better to use one solid, well-fitted shim rather than a stack of three or four loose ones. If a shim doesn’t fit snugly without being forced, trim it down rather than trying to jam it into a space where it doesn’t belong.

Finally, do not forget to account for the thickness of the trim or molding. Always check that the shimmed frame doesn’t interfere with the door’s ability to close completely or engage the latch plate.

Sealing Gaps After Shimming Your Door

Once the door is perfectly level, the gap between the shimmed frame and the RV wall must be sealed to prevent moisture and insects from entering the interior. Use a high-quality, paintable silicone or polyurethane caulk to bridge the gap. Unlike standard household caulk, these products remain flexible, which is critical for an RV that is constantly expanding and contracting in different climates.

If the gap is significant, use a backer rod before applying the sealant to ensure the caulk doesn’t sag into the void. Proper sealing not only improves the longevity of your repair but also creates a thermal break that helps keep the RV at a comfortable temperature. This is the finishing touch that transforms a structural repair into a weather-tight, professional-grade entrance.

Take the time to clean the area thoroughly before applying any sealant. Any dust or debris left behind will compromise the bond, allowing moisture to find its way back into the shimmed area.

A properly shimmed door is more than just a convenience; it is a vital component of your RV’s structural health and overall comfort. By selecting the right material and taking the time to install it with care, you can solve persistent alignment issues and ensure your home on wheels stays weather-tight for years to come.