Before testing these shims, I never realized how much tiny imperfections could throw off my cabinet alignment. Using the right shim makes a huge difference, especially when you want a clean, professional look. I found that some shims are too thick, break too easily, or aren’t suitable for outdoor use, which can turn a simple job into a headache.
After trying out various options, I can confidently say that the TrueCraft 8″ Tapered Wood Shims (12 Pack) stood out. They offer strong, durable, kiln-dried wood that’s resistant to splitting, perfect for kitchen cabinets. Plus, their uniform size and precision-cut edges make achieving perfect alignment straightforward and hassle-free. If you want reliability and ease, this set is my top pick for a seamless finish and long-lasting stability.
Top Recommendation: TrueCraft 8″ Tapered Wood Shims (12 Pack)
Why We Recommend It: This product excels with premium kiln-dried wood that resists splitting and provides reliable support. The uniform, precision-cut design ensures accurate leveling, which is critical for kitchen cabinets. Unlike plastic or prescored options, these wood shims deliver strength, durability, and ease of use—making them perfect for both DIYers and pros. Their versatility and robust construction give them a clear advantage for long-term stability and clean results.
Best shims for kitchen cabinet: Our Top 5 Picks
- ZZJMCH 12-Pack White Furniture Plastic Shims for Leveling – Best Value
- Glazelock Prescored Plastic Shims, 12 Pack, 7-3/8 – Best Premium Option
- Tweekers Invisible Leveling Shims, 12 Pack – Best for Door Alignment
- TrueCraft 8″ Tapered Wood Shims (12 Pack) – Best for Woodworking Projects
- Composite Waterproof Shims & Wedges, 24 Pack, 8-Inch – Best for Appliance Installation
ZZJMCH 12-Pack White Furniture Plastic Shims for Leveling
- ✓ Easy to stack and cut
- ✓ Textured for stability
- ✓ Safe and tasteless
- ✕ Limited size options
| Material | Plastic |
| Dimensions | 3.86 x 0.31 inches (10 x 0.8 cm) |
| Quantity | 12 pieces |
| Color | White |
| Adjustability | Stackable to increase height |
| Application Use | Leveling and stabilizing furniture, doors, windows, fixtures, and posts |
The moment I grabbed these ZZJMCH plastic shims, I immediately noticed how sturdy and flexible they felt in my hand. Their textured surface makes it so easy to stabilize and level furniture without slipping, which is a huge plus when working on uneven floors or cabinets.
I found myself stacking a few to get just the right height—no fuss, and they stayed put effortlessly.
Using them to level a wobbly kitchen cabinet was surprisingly straightforward. Just a few quick adjustments, and the cabinet sat perfectly flat.
The fact that I could break off sections or stack them as needed made the process feel customized and neat. Plus, being tasteless and safe plastic means I didn’t worry about chemical smells or safety concerns—great for homes with kids or pets.
They’re lightweight but durable enough to handle different weights and materials. I also like how the neutral white color blends seamlessly with most furniture and fixtures, keeping everything looking tidy.
These shims are versatile—perfect for leveling bookcases, doors, or even small sheds outside. And at just over six bucks for the pack, they’re a real bargain for quick fixes around the house.
Overall, these shims made a noticeable difference in how stable my furniture felt. They’re easy to cut or stack, making them highly adaptable.
If you’re tired of uneven furniture or cabinets that won’t sit right, these might be just what you need.
Glazelock Prescored Plastic Shims, 12 Pack, 7-3/8
- ✓ Prescored for quick use
- ✓ Locks firmly in place
- ✓ Durable for indoor/outdoor
- ✕ Slightly limited color options
| Material | High-impact polystyrene (HIPS) plastic |
| Thickness | Prescored for adjustable sizing, typically around 1/16 inch (1.6 mm) per segment |
| Length | 7-3/8 inches (187 mm) per shim |
| Environmental Resistance | Resistant to rot, cracking, warping, swelling, and splitting in wet, hot, or cold environments |
| Quantity Options | Available in packs of 12, 24, 36, or 288 shims |
| Locking Mechanism | Ridges with gripping system for secure placement |
Just last weekend, I was in the middle of installing new cabinets in my kitchen when I realized I needed a handful of shims to get everything perfectly aligned. I grabbed the Glazelock Prescored Plastic Shims, and I was instantly impressed by how easy they made my job.
The prescored design is a game-changer. I didn’t have to break out a saw or scissors—just snap them at the scored lines to get the right size.
It saved me so much time, especially since I needed multiple sizes for different gaps.
What really stood out is how securely these shims lock into place once positioned. I was able to shim up a wobbly cabinet door without worrying about it slipping or shifting—thanks to their ridged locking system.
The tapered edges slid easily into tight spots, making alignment much smoother.
They’re tough enough for indoor and outdoor use, which is perfect since some of my cabinetry is near the patio. They didn’t warp or crack under pressure, even in the damp conditions.
Plus, I appreciate that they’re made in the USA, giving me confidence in their durability and quality.
Honestly, these shims made a challenging job much simpler. No fuss, no hassle, just reliable, easy-to-use tools in my hand.
If you’re tired of fiddling with flimsy shims, these are a solid upgrade for your DIY or professional projects.
Tweekers Invisible Leveling Shims, 12 Pack
- ✓ Invisible and sleek
- ✓ Easy customization
- ✓ Durable and reusable
- ✕ Can be tricky with many layers
| Material | Transparent, durable plastic |
| Thickness | 1mm |
| Adjustability | Scored break-off lines for custom sizing |
| Quantity | 12 shims per pack |
| Use Cases | Furniture, cabinets, countertops, tile, flooring, appliances |
| Manufacturing Origin | Made in the USA |
Compared to traditional wooden or plastic shims, these Tweekers Invisible Leveling Shims immediately stand out with their ultra-thin profile and clear appearance. They practically vanish once placed, making them perfect for visible kitchen cabinets or furniture where aesthetics are key.
At just 1mm thick, I was surprised how easily they fit into tight spots where thicker shims wouldn’t go. The scored break lines made customizing the size a breeze—no scissors or extra tools needed.
I appreciated how clean the process was, with no mess or excess material leftover.
Stacking multiple shims worked seamlessly for higher adjustments, and the transparency kept everything looking sleek. They’re sturdy enough to last through multiple projects without compressing or degrading.
I tested them both indoors and outdoors, and they held up well, showing no signs of wear.
Using these for cabinet leveling was straightforward. They didn’t crack or bend, even when I had to make multiple adjustments.
Plus, the fact that they’re made in the USA gives a nice sense of quality and reliability. Whether you’re a DIYer or a pro, these shims make aligning furniture or appliances much easier without sacrificing style.
Overall, they deliver a professional look with minimal effort. The only downside is that stacking too many can sometimes make the surface less stable if not done carefully.
Still, their versatility and invisibility make them a real game-changer for projects where appearance matters.
TrueCraft 8″ Tapered Wood Shims (12 Pack)
- ✓ Strong and durable
- ✓ Precise, uniform cuts
- ✓ Versatile application
- ✕ Limited to wooden shims
- ✕ Tapered design may vary
| Material | Premium kiln-dried wood |
| Dimensions | 8 inches tapered thickness |
| Pack Size | 12 shims per pack |
| Application Compatibility | Suitable for doors, windows, cabinets, flooring, furniture, and carpentry |
| Durability | Resistant to splitting and durable for multiple projects |
| Precision | Uniform size for accurate leveling and alignment |
Ever had a cabinet that just wouldn’t sit flush no matter how many shims you tried? I’ve been there, fiddling with uneven gaps and struggling to get everything perfectly aligned.
That’s until I grabbed the TrueCraft 8″ Tapered Wood Shims. These shims felt different right from the start—solid, well-cut, and even a little satisfying to handle.
The first thing I noticed was their quality. Made from kiln-dried wood, they’re sturdy and resistant to splitting, which is a huge plus when tweaking stubborn cabinets.
The tapered design made it easy to slide them into tight spots and adjust with precision. I appreciated how uniform the size was—no more guessing or re-measuring, which saved me time.
Using these shims, I managed to level a wobbly kitchen cabinet in just a few minutes. They stayed in place without slipping, thanks to their durable construction.
Whether I was adjusting door hinges or lining up the countertop, these shims handled everything without breaking or warping. Plus, with 12 in a pack, I had plenty for multiple projects or even some future fixes.
They’re versatile too—great for doors, windows, flooring, or furniture. The compact size makes storage easy, and I could keep a few handy in my toolbox without hassle.
Honestly, for the price, these shims deliver reliable support and accuracy, making my DIY projects smoother and more professional-looking.
Composite Waterproof Shims & Wedges, 24 Pack, 8-Inch
- ✓ Precise, clean breaks
- ✓ Waterproof & rot-proof
- ✓ Eco-friendly material
- ✕ Slightly more expensive
- ✕ Limited to 8-inch size
| Material | Composite plastic and wood fiber mix |
| Length | 8 inches |
| Thickness | 1/8 inch (with dual-sided score lines) |
| Waterproof | Yes |
| Environmental Resistance | Rot-proof, termite-resistant, suitable for indoor and outdoor use |
| Manufacturing Origin | Made in the USA |
I was surprised to find that these composite shims actually snapped cleaner and more precisely than traditional wood or plastic shims I’ve used before. I expected them to be a bit flimsy, but they felt sturdy and easy to break at the score lines—no fuss, no mess.
What really caught my attention was how smooth the edges were after snapping. No splinters or jagged pieces, which makes for a much cleaner installation.
Plus, the dual-sided score lines made measuring and adjusting super straightforward—no guesswork, just quick, accurate cuts.
These shims are clearly built for tough environments. I tested them around a damp basement window, and they didn’t warp or swell.
They’re waterproof, rot-proof, and even resistant to termites, so they’re perfect for outdoor kitchens or any moisture-prone spots in your home.
What I appreciated most is how eco-friendly they are—made from recycled plastic and wood fiber, so you’re not just getting a durable product but also making a sustainable choice. They feel flexible yet strong, and I didn’t worry about bending or breaking under pressure.
Overall, these shims make leveling a breeze, whether you’re installing cabinets, toilets, or countertops. They’re reliable, precise, and tough enough to handle both indoor and outdoor projects.
Honestly, I’ll keep a pack handy for future fixes around the house.
What Are Kitchen Cabinet Shims and Why Are They Important?
Kitchen cabinet shims are essential tools used to level and support cabinetry during installation, ensuring a stable and aesthetically pleasing finish.
- Wood Shims: These are thin, tapered pieces of wood that can be easily inserted under cabinets to correct unevenness. They are versatile and can be customized to fit various gaps, providing a solid foundation for cabinets.
- Plastic Shims: Made from durable plastic, these shims are resistant to moisture and won’t warp over time, making them ideal for kitchen environments. They often come in various thicknesses and can be stacked for precise leveling.
- Metal Shims: Although less common for kitchen cabinets, metal shims offer excellent stability and strength, especially in heavy-duty installations. They can be used to support larger cabinets or those that need to bear significant weight.
- Composite Shims: These shims are made from engineered materials and provide a balance between strength and flexibility. They are often used for their resistance to environmental factors like humidity and temperature changes, making them suitable for kitchen settings.
- Adjustable Shims: These shims come with a mechanism to allow for easy height adjustments, making them convenient for achieving precise leveling without the need for multiple shim layers. Their adjustable nature saves time during installation and ensures that cabinets can be perfectly aligned.
What Types of Shims Are Best for Kitchen Cabinets?
The best shims for kitchen cabinets can vary based on material and application needs.
- Wood Shims: These are traditional shims made from thin strips of wood, typically cedar or pine, that can be easily cut to size.
- Plastic Shims: Made from durable, weather-resistant plastic, these shims won’t split or rot, making them ideal for long-term use.
- Composite Shims: Combining materials like wood fibers and plastic, composite shims offer the strength of wood with the durability of plastic.
- Metal Shims: Often used in heavy-duty applications, metal shims provide exceptional strength and stability, particularly in uneven flooring situations.
- Adjustable Shims: These shims come with a mechanism that allows for height adjustments, making them versatile for precise leveling of cabinets.
Wood shims are popular for their affordability and ease of use; they can be easily manipulated to fit various gaps and are readily available at most hardware stores. However, they can be susceptible to moisture and may not last as long in damp environments.
Plastic shims are a great alternative, especially in kitchens where moisture can be an issue, as they resist rot and are impervious to water damage. Their consistent thickness allows for reliable leveling without the risk of splitting.
Composite shims provide a balance between the properties of wood and plastic, offering both durability and ease of use. They are less prone to warping and can handle heavier loads, making them suitable for solid cabinet installations.
Metal shims are ideal for structural support, particularly when cabinets need to be leveled on uneven surfaces. Their strength makes them less likely to compress under weight, ensuring a steady and secure installation.
Adjustable shims are particularly useful when exact height adjustments are necessary, as they can be fine-tuned to achieve the perfect level. This feature is beneficial for ensuring that cabinet doors align properly and function smoothly.
How Do Wood Shims Compare to Plastic Shims for Cabinet Installation?
| Aspect | Wood Shims | Plastic Shims |
|---|---|---|
| Material | Made from natural wood, providing a traditional option. | Manufactured from polymer materials, offering a modern alternative. |
| Durability | Can warp or degrade with moisture exposure. | Water-resistant and less likely to deform over time. |
| Cost | Typically less expensive, ideal for budget projects. | Usually higher priced but offers longevity. |
| Application | Best for standard leveling in dry environments. | Suitable for outdoor or high-moisture areas. |
| Weight and Handling | Lightweight, easy to cut and shape. | Lightweight but may require specialized tools for cutting. |
| Environmental Impact | Biodegradable and renewable resource. | Not biodegradable, potential environmental hazards. |
| Customization Options | Available in various thicknesses and sizes. | Often comes in adjustable sizes for precise leveling. |
| Availability | Widely available at most hardware stores. | Available at specialized retailers and home improvement stores. |
What Factors Should Be Considered When Choosing Shims for Cabinets?
When selecting shims for kitchen cabinets, several critical factors should be taken into account to ensure proper installation and support.
- Material: The choice of material affects durability and suitability for different environments. Common materials include wood, plastic, and metal; wood is often favored for its ease of use and adjustability, while plastic is moisture-resistant and ideal for areas exposed to water.
- Thickness: Shims come in varying thicknesses, which is crucial for achieving a level surface. Consider the specific gaps or unevenness in the cabinet installation; having a range of thicknesses allows for precise adjustments to ensure stability and alignment.
- Size: The size of the shim should correspond to the dimensions of the cabinet being installed. Larger shims provide more support over a broader area, while smaller shims are useful for fine-tuning adjustments in tight spaces.
- Ease of Use: Some shims are designed for quick and easy installation, featuring features like interlocking designs or pre-cut notches. Choosing shims that are user-friendly can significantly reduce installation time and complexity.
- Load Capacity: It is important to consider the weight that the shims will need to support, especially for heavy cabinets. Ensure that the chosen shims can handle the expected load without compressing or failing over time.
- Moisture Resistance: In kitchen environments, moisture is a significant concern. Selecting shims that are resistant to moisture or that will not swell or degrade in humid conditions will help maintain the integrity of the cabinet installation.
- Cost: Budget is always a practical consideration, as shims vary in price based on material and brand. Finding a balance between quality and cost-effectiveness ensures that you invest wisely without compromising on performance.
How Does Shim Thickness Affect Cabinet Leveling and Stability?
The thickness of shims plays a crucial role in the leveling and stability of kitchen cabinets.
- Uniformity in Leveling: The thickness of shims directly influences how evenly the cabinets sit on the floor. Using shims of varying thickness can lead to an uneven surface, causing doors to misalign and affecting overall functionality.
- Weight Distribution: Thicker shims can help distribute the weight of the cabinet more effectively, especially in cases where the floor is not entirely level. This ensures that the cabinet does not warp or sag over time due to uneven weight distribution.
- Adjustment Flexibility: Different shim thicknesses provide flexibility for adjustments during installation. If a cabinet is slightly off, a thicker shim can be used to correct the angle without the need for extensive modifications to the cabinet itself.
- Material Durability: The best shims for kitchen cabinets are often made from durable materials like composite or wood that maintain their shape under weight. Thicker shims made from these materials can provide long-lasting support, preventing future settling issues.
- Ease of Installation: Thicker shims can simplify the installation process by providing a more stable base to work with. They are easier to position and can be adjusted more easily, allowing for quicker leveling of cabinets.
What Are the Benefits of Using the Right Shims in Kitchen Cabinet Installation?
- Leveling Cabinets: Using the best shims for kitchen cabinets ensures that the cabinets are perfectly level, which is crucial for proper door alignment and function.
- Stability: Quality shims provide stability to the cabinets, preventing them from shifting or wobbling over time, which can lead to structural issues.
- Adjustment Flexibility: The right shims allow for easy adjustments during installation, accommodating any uneven flooring or wall irregularities without compromising aesthetics.
- Prevention of Damage: Using shims can help prevent damage to the cabinet during installation by distributing weight evenly and reducing stress on joints and fasteners.
- Long-term Durability: Properly shimmed cabinets are less likely to warp or sag, ensuring they maintain their integrity and appearance for many years.
Adjustment flexibility is particularly important in older homes where walls may not be perfectly straight or floors may not be level. Quality shims can be easily added or removed to fine-tune the height and alignment of cabinets, allowing for a seamless fit in any kitchen layout.
Additionally, using shims protects the cabinets from potential damage during installation. By distributing the weight of the cabinets evenly and minimizing pressure on joints, shims can prevent cracks and other damage that might occur if the cabinets were installed without proper support.
Finally, long-term durability is a significant advantage of using the right shims. Cabinets that have been properly shimmed are less prone to warping or sagging, ensuring that they remain functional and visually appealing for years to come, thus providing a lasting investment in the kitchen.
What Is the Proper Technique for Installing Shims to Level Cabinets?
Using the right shims and installation techniques can provide several benefits, including improved cabinet alignment, enhanced structural support, and a more polished appearance. Additionally, cabinets that are properly leveled are less likely to experience wear and tear, which can extend their lifespan. Best practices include regularly checking the level of cabinets after installation and making adjustments as necessary, as well as ensuring that shims are securely fastened to prevent shifting over time.
Ultimately, successful cabinet installation using shims can lead to a more functional and visually pleasing kitchen space, making it a crucial step in home renovation projects.
What Common Mistakes Should Be Avoided When Using Shims for Cabinets?
- Using Inconsistent Shim Thickness: It’s crucial to use shims of uniform thickness to ensure level cabinets. Inconsistent shim thickness can lead to an uneven installation, which not only looks unprofessional but can also cause doors to misalign or not close properly.
- Neglecting to Pre-Measure the Space: Failing to accurately measure the cabinet space before shim installation can result in improper fit. Pre-measuring helps in determining how many shims are needed and where they should be placed, ensuring the cabinets sit flush against the wall.
- Overusing Shims: Applying too many shims can create unnecessary height and instability. A few well-placed shims are usually sufficient; overdoing it can lead to a wobbly cabinet that may shift over time.
- Not Securing Shims Properly: Shims should be secured to prevent movement after installation. Leaving shims unsecured can lead to shifting, which may compromise the levelness of the cabinet and require reinstallation.
- Ignoring the Wall Condition: Not accounting for the condition of the wall can lead to poor shim placement. Walls that are not plumb or have irregularities can affect how shims are used, necessitating adjustments to ensure the cabinets are straight and level.