
When it comes to putting trim on a wall, there are several factors to consider when choosing the right finishing nails. The type of nail gun and nails used will depend on the specific requirements of your project, such as the thickness of the trim and the need for a very small hole. While a nail gun is often preferred for its efficiency and ease of use, it is possible to attach trim by hand nailing or using a stapler. Let's explore the options available for your wall trim project.
| Characteristics | Values |
|---|---|
| Type of nail | Finish nail, Brad nail, Hard trim nail |
| Nail gauge | 15-gauge, 16-gauge, 18-gauge |
| Nail length | 2", 2.25", 2.5", 3" |
| Nail head | Angled, Straight |
| Nail application | Nail gun, Hammer, Nail set, Spring nailset |
| Wall type | Drywall |
| Wall studs | Spaced 16 inches apart |
| Filler | Spackling paste, Wood filler, Putty, Caulk, Wood putty |
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What You'll Learn

Standard finish nails are usually fine, but some prefer galvanised finish nails
When it comes to putting trim on a wall, the type of finishing nails you use can make a difference. Standard finish nails typically get the job done, but some carpenters prefer galvanised finish nails for a few reasons.
Standard finish nails are usually sufficient for attaching trim to walls. These nails are designed to penetrate wall studs, ensuring the trim is securely anchored in place. Using a nail set, you can drive the nail head slightly below the surface of the wood, creating a neat finish. Filler can then be used to cover the nail holes, leaving a smooth and seamless appearance.
However, some carpenters opt for galvanised finish nails, which offer certain advantages. Galvanised finish nails have a slightly rough surface, providing a firmer hold. This added texture helps prevent the nails from working loose over time. Additionally, galvanised nails resist rust, addressing a common issue with standard nails.
Another factor to consider is the size of the nails. For thicker trim, 16-gauge or 15-gauge finish nails are recommended. These larger nails provide greater holding power and are less likely to be affected by seasonal moisture changes. On the other hand, 18-gauge nails are suitable for thinner trim, typically up to 1/2" thick. They leave smaller holes, which are easier to fill, but may not provide the same level of holding power as their larger counterparts.
When using a nail gun, it's important to select the appropriate type. Finish nail guns are typically recommended for trim work, as they can accommodate the larger nail sizes required for the job. Brad nail guns, which are typically used for more delicate work, may not be able to fit nails longer than 2". Additionally, the use of a nail gun can speed up the process and reduce the risk of damaging the trim, although it may be necessary to pre-drill pilot holes to guide the nails and prevent splitting.
In summary, while standard finish nails are generally adequate for attaching trim to walls, some carpenters prefer galvanised finish nails for their increased holding power and rust resistance. The size of the nails and the use of a nail gun are also important considerations to ensure a secure and professional finish.
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For a very small hole, use hard trim nails
When attaching trim to a wall, it is important to ensure that the trim is anchored firmly to prevent it from pulling away from the wall. While standard finish nails usually work fine, if you want to create a very small hole, opt for "hard trim" nails, which are very thin.
Hard trim nails are thinner than standard finish nails, resulting in a smaller hole. This type of nail is ideal if you want to minimise the visibility of the nail holes in your trim work. They are also useful when working with thin and narrow trim boards, as they help to firmly secure the trim to the wall studs.
When using hard trim nails, it is important to note that they may require additional support. One way to achieve this is by using short staples along with the nails, as staples tend to attach more firmly than short nails. Additionally, you may need to use a larger quantity of hard trim nails compared to standard finish nails to ensure a secure hold.
Another factor to consider when using hard trim nails is the depth of penetration. To ensure a strong hold, aim for the nails to penetrate the wall studs. In some cases, drilling a pilot hole before nailing can help prevent splitting the board, especially if nailing within 2 inches of the end of a board. The pilot hole should be slightly narrower than the nail's shank and should only go through the molding piece without penetrating too deeply into the stud.
By following these guidelines and using hard trim nails, you can achieve a secure and aesthetically pleasing finish when attaching trim to walls while minimising the appearance of nail holes.
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Use a finish nail gun for wall trim
Using a Finish Nail Gun for Wall Trim
A finish nail gun is ideal for installing wall trim. Finish nail guns are primarily used for shooting 15-gauge or 16-gauge nails, which are stored at an angle in the nail gun, allowing for easy access in tight spots. Finish nail guns are also available in 18-gauge, which is suitable for thin trim work.
Choosing the Right Nails
Standard finish nails usually work fine for wall trim. However, many carpenters prefer to use galvanized finish nails as they hold firmer due to their slightly rough surface, and they resist rusting. If you want very small holes, use "hard trim" nails, which are very thin.
Preparing the Trim
Before nailing the trim to the wall, it is important to mark the length of the trim by holding it in place. If the piece is too long to hold alone, tack one end to the wall with a brad nail, mark the length, then remove the trim and the brad nail. This will give you an accurate cutting mark and only one extra nail hole to fill later.
Attaching the Trim
When attaching the trim to the wall, it is important to ensure that the trim is anchored firmly to prevent it from pulling away from the wall. Trim should be attached to wall studs, which are usually spaced every 16 inches. Use a stud finder to locate the studs before attaching the trim.
Using the Finish Nail Gun
When using a finish nail gun, you can position parts perfectly without measuring or marking. The nail gun allows you to reach and shoot nails in tight spaces. It is important to use a soft rubber tip with the nail gun to protect the surface. After nailing, fill the nail holes with wood filler, allow it to dry, and then sand lightly for a smooth finish.
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A nail gun is quicker and easier than a hammer and nails
When it comes to putting trim on a wall, using a nail gun is undoubtedly quicker and easier than the traditional method of a hammer and nails. While hammers are the mainstay of carpentry, and there is a certain romance to pounding nails with a hammer, a nail gun offers speed, efficiency, and convenience.
Nailing trim onto a wall can be a tricky task, as trim boards are often thin and narrow, requiring firm anchoring to prevent them from pulling away from the wall. This is where a nail gun shines. With a nail gun, you can quickly and easily drive nails into the trim, ensuring a secure hold. The process is simple: just pull the trigger, and the nail is driven into place. This is much faster than the time-consuming process of manually hammering each nail.
Another advantage of using a nail gun is precision. Nail guns allow for easy access in tight spots, ensuring that nails are driven into the correct spots, such as wall studs, which are essential for a firm hold. With a hammer, it can be challenging to achieve the same level of accuracy, especially in confined spaces.
Additionally, nail guns reduce the risk of damaging the trim. When using a hammer, it is easy to miss the nail and mar the wood, requiring repairs and touch-ups. Nail guns minimise this risk, resulting in a neater finish with fewer errors. They also allow you to hold the trim with one hand while driving the nail with the other, providing better control and stability during installation.
While nail guns offer speed and convenience, they do require an initial investment. Purchasing a nail gun and its accessories, such as a compressor or cartridges, can be costly, especially if you only plan on using it for a single project. However, nail guns have become more affordable over time, and the time and effort saved by using one may outweigh the expense.
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Predrill the trim to protect from splits
When installing trim, you need to take precautions to prevent the wood from splitting. Predrilling the trim is one of the most effective ways to do this. Drilling holes for your nails before hammering them in will reduce the amount of force used to penetrate the wood, minimising the risk of splits.
To predrill your trim, start by measuring out enough space from edge to edge to ensure you keep the nails as close to the centre of the trim as possible. The closer you are to the sides of thin wood trim, the more likely it is to split. Use a stud finder to locate the studs, and mark their location on the wall with a narrow piece of painter's tape. Then, use a drill bit about 1/32 inch smaller than the nail size to predrill nail holes every 12 to 16 inches. Remember to stay at least 1 inch away from the ends of the trim to avoid splitting. If you are driving a nail within 2 inches of the end of a board, it is especially important to predrill a pilot hole to ensure against splitting the board.
If you are using a nail gun, you may not need to predrill holes. However, if you are nailing by hand, predrilling is usually necessary to prevent splits. If you are using a nail gun and are still concerned about splitting, you can blunt the nails by placing the nail tip-down onto a hard, flat surface and hammering the head a few times. This will flatten the tip, allowing the nail to drive right through the wood instead of wedging into it and causing splits.
If you want to avoid the possibility of splitting altogether, you can opt to glue your trim in place instead of nailing it. Wood glue will hold your trim in place, but make sure you purchase a quality brand that will not give way with heavier trim or in different weather conditions.
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Frequently asked questions
Finishing nails are typically 16-gauge or 15-gauge nails used for finish carpentry, such as wall trim.
A finish nail gun is typically used for installing trim on walls. A brad nail gun can also be used for trim if it can accommodate 2" nails, but it is typically used for more delicate work.
The length of the finishing nails will depend on the thickness of the trim. For trim that is 1/2" thick, 18-gauge nails are suitable. For thicker trim, 16-gauge or 15-gauge nails are recommended to ensure the trim does not pull away due to seasonal moisture changes.
While a nail gun is not strictly necessary, it is much quicker and easier to use than hammering nails in by hand. A nail gun also reduces the chance of damaging the trim by denting or splitting the wood.
It is recommended to drill pilot holes before nailing near the end of a board to prevent splitting. When using a nail gun, pre-drilling the trim can also help protect against splits. After nailing, the holes can be filled with wood filler and sanded for a smooth finish.











































