
Installing trim can be a tremendously rewarding endeavour, but it can be intimidating for beginners. The most important tools for installing trim are a sharp pencil and a nail gun. The easiest and most effective way to nail in a piece of trim is with a nail gun, specifically a finish (trim) nail gun. Finish nailers are ideal for installing baseboards and cost relatively little, ranging from $80 to $200. They can also be rented or borrowed. If you don't want to use a nail gun, you can use a nail set or a drill, though this may be difficult if you lack upper body strength.
| Characteristics | Values |
|---|---|
| Easiest and most effective way to nail trim | Nail gun |
| Types of nail guns | Finish Nailer, Brad Nailer |
| Ideal nail gun for installing baseboards | Finish (Trim) Nailer |
| Cost of Finish (Trim) Nailer | $80-$200 |
| Alternative to nail gun | Drill and screw |
| Alternative to nail gun for baseboards | Hand-nailing |
| Tool to cut trim | Compound miter saw |
| Angle to cut trim | 45 degrees |
| Tool to smooth uneven edges | Nail file or emery board |
| Tool to fill nail holes | Spackling paste, wood filler |
| Types of nails | Brad nails, finishing nails, pin nails |
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What You'll Learn

Using a nail gun
There are two main types of nail gun motors: pneumatic and electric. Pneumatic nail guns, or air nail guns, are powered by compressed air and are the most popular choice for professionals due to their incredible power and variety of models. Electric nail guns can be powered by an electrical cord or a battery pack, with the latter offering greater portability.
When selecting a nail gun, it is important to consider the nail gun angle, which refers to the nail collation angle or the angle at which the nails are collected and stored in the nail gun's magazine. Nail guns can offer angles ranging from 15 to 34 degrees. The angle will determine the type of nail heads and the number of nails the gun can accommodate. For example, 15-degree nail guns can hold a large number of full-round-head nails, while 28-degree nail guns hold offset-head or clipped-head nails.
For installing thick trim, a 15-gauge nail gun is typically used. However, if you are working with thin trim, an 18-gauge or higher-gauge nail gun would be more suitable. The 16-gauge nail is the most versatile size and can be used for many different projects.
To install trim with a nail gun, it is recommended to use finish nails, which have small heads that sink into the wood, making them barely visible and easy to plaster or paint over. When nailing baseboards, it is important to locate the studs along the wall using a stud finder and mark their locations in advance. This will help determine how far apart to space the nails.
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Drilling pilot holes
Before you start, make sure you have the right drill bit for the job. For drilling pilot holes for nails, choose a drill bit that is slightly smaller in diameter than the nail's shank. It's important to select the appropriate size to ensure the hole is not too wide or too narrow. Mark the location of the pilot hole with a pencil or create an "X" with painter's tape over the desired location. This will reinforce the wood and provide extra protection against cracking.
Once you've marked the spot, use the tip of a nail or an awl to create a slight indentation. This will help guide your drill bit and prevent slipping. Place the drill bit into the chuck, ensuring it's fully seated and tightened completely. Adjust the drill/driver's setting to the drill mode. It's important to wear eye protection when operating the drill.
Start drilling the pilot hole, applying gentle pressure to ensure the hole is straight and accurate. Drill until the hole reaches the same depth as the length of your nail. You can use a drill stop or mark the drill bit with tape or a twist-tie to help gauge the depth. Once you've reached the desired depth, slowly back the drill bit out while keeping it perpendicular to the wood.
Now you're ready to nail through the pilot hole. If you're nailing trim, be sure to use the appropriate nails and spacing for the best results. Drilling pilot holes can make your nailing process more precise and help protect the wood from damage.
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Using the correct nails
Firstly, determine the type of trim you are working with. For baseboard trim, brad nails or finish nails are commonly used. Brad nails are typically made of 18-gauge wire, range from 1/2 inch to 2 inches in length, and have a smaller diameter and head compared to finish nails. They are ideal for thinner pieces of wood, such as fiberboard and plywood, as they provide a clean finish and are less prone to splitting the wood. On the other hand, finish nails are usually made of 15- or 16-gauge wire and range from 1 inch to 3 1/2 inches in length. They are better suited for thicker pieces of wood and provide stronger holding power.
When installing baseboards, it is recommended to use a finish (trim) nail gun, which can shoot 15-gauge or 16-gauge finish nails. These nail guns are relatively inexpensive, easy to use, and can also be used for various home improvement projects. If you prefer not to use a nail gun, you can opt for a nail set, which is a manual tool that helps drive the nails into the trim. A small pilot hole can also be made to guide the nail and prevent it from bouncing off, especially when dealing with harder trim materials.
For crown molding, both brad nails and finish nails can be used. However, it is important to consider the thickness of the molding and the holding power required. If you are working with thicker wood or heftier projects, finish nails are generally a better option due to their larger diameter and stronger holding strength. Additionally, when nailing through joints in the trim, use nails that are long enough to penetrate both pieces of wood securely.
To achieve a seamless finish, it is recommended to use nails that are less noticeable. Pin nails, for example, are 23-gauge headless pins that range from 1/2 inch to 2 inches in length. They are virtually invisible and do not require filling the holes they create. Brad nails, due to their smaller diameter, also result in smaller holes that might not need wood filler before painting.
Lastly, to conceal the nail holes and create a smooth finish, use an appropriate wood filler or spackling paste. Sand the filled areas for an even finish, and touch up with leftover paint or stain to match the trim.
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Finishing with filler
Once you've nailed your trim in place, you'll want to fill in the nail holes to achieve a professional, finished look. This simple project requires only a few tools, but the results will help your project look polished.
Types of Filler
There are two main types of wood fillers: water-based fillers and solvent-based fillers. Water-based wood fillers are adequate for most interior applications. They have a creamy consistency and are easy to smooth on and clean up. Solvent-based fillers, on the other hand, are sticky and oily and can be difficult to clean up if you wait until they dry.
If you plan to paint your trim, you can use any colour of wood filler since it will be covered with paint. However, if you're using pre-finished trim or will be finishing it with a stain or clear sealer, carefully select a colour-matched filler that blends with the natural colour of the wood. Fillers come in various colours to match common wood species, and you can also purchase kits that include a filler base and colourants that you can mix to create custom colours.
Some people also use caulk to fill nail holes, but it tends to be messier, shrinks more than wood filler, and cannot be sanded smooth. If you do use caulk, make sure it is labelled as "paintable", and be careful not to leave smears on the wood surface, as they may show up after painting.
Applying the Filler
For most nail holes, you can simply use your finger to apply the filler. Put a small dab of filler onto your index finger, press it into the hole, and swipe it smooth. When using water-based filler, keep a damp cloth nearby to wipe any drying filler off your finger and ensure consistent application. Avoid pressing excess, partially dried filler into the holes, as it may not adhere properly.
For deeper or larger holes, or if you've dimpled the wood with a hammer, you may need to use a putty knife. Scoop up a small amount of filler with the knife, press it into the hole, and smooth off the excess to create a flat, finished surface. Remember to close the lid on the wood filler between applications, as it hardens quickly.
Once the filler is dry, you can sand it smooth if needed and then paint or stain over it for the best-looking results.
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Painting the trim
Painting trim requires precision and patience. The right techniques make a difference in the final appearance of your room. Here is a step-by-step guide on how to paint your trim:
Preparation:
Before starting to paint, it is important to prepare the area. Move any furniture away from the work area. If there is carpet, use a paint shield or carpet shield to protect it. Alternatively, you can pull back the carpet or use a flat putty knife to tuck masking tape between the baseboard and the carpeting. For hard flooring, run painter's tape along the floor where it meets the trim.
Clean the surface:
Use a damp sponge to clean the trim. For kitchens, use soapy water to remove grease buildup. Sand the surface of the trim, starting with coarse 80-grit sandpaper, then moving to less coarse 100- and 120-grit sandpaper. Wipe away the dust with a lint-free cloth or a clean damp sponge.
Filling:
If there are any cracks, holes, or dents, fill them with a spackling compound. Once dry, sand the area again with fine-grit sandpaper and remove the dust. Use caulk to fill any gaps between the trim and the wall.
Painting technique:
Use a brush, roller, sprayer, or a combination of these to paint the trim. It is recommended to use two to three coats of paint to achieve a great finish. For the best results, purchase pre-primed boards. When using a brush, grip it loosely near the bristles, forming a wedge shape. Use the sharp end of the wedge to start the paint line, then draw the bristles along the line, allowing them to fan out. Create flat crescent shapes with the paint, starting slightly away from the line, then moving over and tracking along it. Apply several crescents in a row to create a long, straight line.
Cutting in:
Cutting in is a technique used to paint along edges where walls meet ceilings, windows, or door frames. It requires a steady hand and the right technique. Load your brush with paint, dipping it no more than halfway in, then tap off the excess. Start a few inches from the edge and work your way in, using light pressure for precise control.
Finishing touches:
Save any leftover paint for touch-ups after nailing the trim in place. Use wood filler to camouflage nail holes, then paint over them for the best finish.
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Frequently asked questions
Using a nail gun is the easiest and most effective way to nail in a piece of trim. Finish (trim) nail guns are ideal for installing baseboards and are relatively inexpensive, ranging from $80 to $200.
Brad nails, or finishing nails, are the most popular choices. Brad nails are smaller in diameter and have a smaller head, providing a clean finish. Finishing nails are bigger in diameter and are ideal for thicker wood and heftier projects.
Spackling paste is designed to form and stay in place and does not change shape easily. Its texture makes it more amenable to holes, and it is easy to clean up. For stained wood, use a water-based wood filler.











































