
Nailing baseboards and crown molding can be a challenging task. It is crucial to attach baseboards to walls, and the easiest way to do this is by using a nail gun. Finish nail guns are ideal for this purpose and are relatively inexpensive, ranging from $80 to $200. When nailing crown molding, it is important to hit a solid background, such as plates or studs, to ensure a secure hold. The size of the nails also matters, as using nails that are too short or too long can affect the security and integrity of the trim. For baseboard trim, finish nails ranging from 2 to 2.5 are recommended. To achieve a smooth finish, use paintable caulk and run your finger over the spot to smooth it out.
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What You'll Learn

Using a nail gun
First, consider the type of nail gun you will need. Finish nail guns are ideal for installing tall trim as they are slightly bigger than brad nailers, allowing them to use 15 and 16-gauge nails. These larger nails have more holding power and withdrawal resistance, making them suitable for securing larger pieces of trim. Finish nailers can be corded, cordless, or pneumatic, offering a variety of options to choose from. However, it is important to note that the larger nails used in finish nailers will leave more visible holes in the trim, requiring additional effort to properly cover them.
If you are working with lightweight or thin trim, a brad nail gun might be a better option. Brad nailers use fine 18-gauge nails that are perfect for installing interior trim. These small nails leave barely any holes, making them easier to cover than the holes left by finish nailers. Brad nail guns are also great for light-duty projects and can be useful for reinstalling trim and baseboards during painting projects.
For narrow pieces of trim, a pin nail gun might be the best choice. Pin nails are very small and are ideal for situations where using a larger gauge of nail might risk splitting the wood. However, due to their size, pin nails have less holding strength and withdrawal resistance, so they should only be used for lightweight materials.
When using a nail gun, it is important to follow safety precautions. Always wear protective gear, including eye and ear protection, and ensure that you have a clear workspace free of obstacles. Be mindful of your surroundings and keep bystanders a safe distance away from your work area. Additionally, make sure to read the instructions for your specific nail gun model and become familiar with its operation before beginning your project.
Finally, proper maintenance of your nail gun is crucial. Regularly inspect and clean your nail gun to ensure it is in good working condition. Keep the nail gun well-lubricated according to the manufacturer's recommendations, and always use the correct type and size of nails specified for your particular nail gun. By following these instructions and choosing the right type of nail gun for your tall trim project, you can achieve efficient and safe results.
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Choosing the right nail size
Thickness and Weight of the Trim: The thickness and weight of the trim material will determine the required holding power and nail size. Thicker and heavier trims will require longer and thicker nails to provide a secure attachment.
Holding Power: Consider the desired holding power needed for your project. Finishing nails have thicker gauges and larger heads, providing better holding power and a more secure attachment. Brads, on the other hand, are thinner and shorter with smaller heads, making them ideal for delicate trim pieces and situations where minimal splitting or damage to the trim is desired.
Potential for Splitting: The type of nail you choose can impact the potential for splitting in the trim material. Brads are less likely to split the wood, while finishing nails may cause splitting in thinner trim pieces. If splitting is a concern, consider using brads or smaller finishing nails.
Length and Gauge: When installing baseboards, consider the length and gauge of the nails. The nail should be long enough to penetrate the drywall or studs securely. A good rule of thumb is to use a nail that is approximately 2.5 times the thickness of the baseboard. For example, if your baseboard is 0.5 inches thick, a nail length of approximately 1.25 inches is recommended.
Material of the Trim: Different types of trim materials may require specific nail sizes and types. For example, wood trim may require longer nails compared to PVC or MDF trim. Always refer to the manufacturer's recommendations for the specific type of trim you are using.
By considering these factors and following the specific recommendations for each application, you can confidently select the right nail size for your trim project and achieve professional-looking results.
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Using a nail set
When using a nail set, it is crucial to maintain control and precision. Striking the nail set too forcefully or at an incorrect angle can lead to unwanted marks or dents on the trim surface. Practicing on a scrap piece of wood or an inconspicuous area of the trim can help you get a feel for the right amount of force needed. It is also important to choose the correct size of nail set for the nails being used. A nail set that is too large or too small can make it difficult to achieve the desired result.
Additionally, when using a nail set, it is essential to prioritize safety. Always wear protective eyewear to shield your eyes from potential nail or wood debris. Keeping your hands and fingers behind the nail set can help prevent accidental hammer strikes. Maintaining a steady grip on the nail set and being mindful of your surroundings are also key to avoiding injuries.
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Filling in nail holes
Prepare the Surface
Before filling the nail holes, ensure that the surface is ready for the filler. If there is any movement in the trim, use screws, nails, or glue to secure it in place. It is also important to fill in any cracks or imperfections around the nail holes and between the trim and the wall. Use a putty knife, your fingers, or any suitable tool to push the filler into these gaps and cracks. Remove any excess filler and let it dry.
Choose the Right Filler
Selecting the appropriate filler is crucial for achieving a seamless finish. Spackling paste or lightweight spackle is highly recommended for filling nail holes in baseboards and trim. It is designed to stay in place without changing shape, making it easier to work with. If your trim will be stained, opt for a water-based wood filler. For larger holes, a finishing plaster compound can be an excellent choice, as it dries smoothly without shrinkage or cracking.
Fill the Nail Holes
Start by filling the nail holes with your chosen filler. Use your finger or a putty knife to apply a small amount of the filler into each nail hole. Ensure the filler is level with the surface of the trim. If you are using spackle, let it dry for about 20 minutes, then use a damp sponge to clean off any excess. Apply a second coat if needed to fill any remaining indents.
Sanding and Finishing
Once the filler has dried completely, you can sand the area gently to ensure a smooth and even finish. If necessary, apply a minor touch-up with the filler until you achieve the desired result. If you plan to paint or stain the trim, follow the specific instructions for your chosen product. It is generally recommended to paint or stain the trim after filling the nail holes to achieve the best-looking results.
Tips for a Seamless Finish
To make the filled nail holes even less noticeable, consider these tips:
- Use a crayon, fill stick, or pencil filler that matches the colour of your trim.
- If your trim is painted, use a tiny paintbrush to paint over the filled holes, sealing and finishing them.
- For white trim, toothpaste can be used to fill the holes, followed by wiping off any excess with a damp paper towel.
- If you want to avoid repainting, consider using a tool kit to apply wax. Heat up a wax stick slightly for easier application, then use the sharp plastic edge to remove excess and the buffing pad to blend it in.
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Painting before installation
Painting before installing trim can be a major energy and time saver, provided you have the space to do so. For the best results, purchase pre-primed boards whenever possible. Painting trim before installation is a fast and easy process that can speed up paint time. People who paint trim before installing tend to place the boards on sawhorses over a drop cloth. You can use a paint roller or spray painter to paint the trim before installing it. The advantage of this approach is that you won't have to worry about getting any paint on the wall, floor, or surrounding area.
However, there are some advantages to painting trim after installation. It might take more time, but you don't have to worry about how you're going to cover up the nails, caulk, and scuff marks. Painting after installation can also be beneficial for people who don't have the space to paint the trim beforehand. Setting up sawhorses and drop cloths requires a lot of space, and sometimes that isn't available. If the walls also need to be repainted, it's best to install the trim, prime and paint it, caulk it, apply a finishing coat, and then paint the walls.
If you don't want to paint your trim at all, you can opt for pre-painted mouldings, which save time and ensure you don't have to worry about drips, splatter, or messes on the walls or ceilings.
When painting trim, it's important to properly prepare the material. Caulking edges that are coming away from the wall and lightly sanding places that are peeling will ensure a great finish. Filling nail holes and smoothing out ragged corners and divots will also make the paint look neat and crisp.
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Frequently asked questions
Using a nail gun is the easiest and most effective way to nail in tall trim. Finish nail guns are ideal for installing baseboards and can be used for many other home improvement projects.
Finish nail guns are ideal for shooting 16-gauge or 15-gauge nails. They are relatively inexpensive and will last for years.
The size of the nails matters. Nails that are too short may not secure the trim properly, while nails that are too long may split the material. The ideal nail length for fastening different materials should be three times the thickness of the material.
Using a nail set can help to keep the hammer away from the trim. Drilling a small pilot hole in the baseboard can also make it easier to drive the nail in without damaging the trim.
You can fill in the nail holes with paintable caulk and then smooth it over with a damp finger to create a smooth finish.










































