
Trimming a door is a simple DIY project that can be completed in an afternoon. The right type of door trim depends on your home's style and your personal preferences. Before installing the trim, ensure that the jamb and wall are flush. Use a pry bar to carefully remove any old trim. Then, measure the reveal (the small gap between the door jamb and the trim) and mark a consistent reveal of 1/8 to 1/4 inch around the door frame. Hold a casing leg in place, checking how it meets the floor, and mark where the reveal on the jamb head meets the leg. Cut the legs using a miter saw set to 45 degrees. When nailing the trim, use finish nails (4d and 6d sizes) and avoid nailing too close to the edges to prevent splitting the wood. Finally, fill the nail holes with wood filler or paintable putty and sand for a smooth finish.
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What You'll Learn
- Use the right tools: a miter saw, tape measure, pencil, level, hammer/nail gun, and more
- Measure the reveal and create a symmetrical appearance around the door
- Secure the trim with finish nails, wood filler, and painter's caulk
- Trim the back of the miter cut with a block plane, knife, or rasp
- Use wood glue and brads to secure corners and connect pieces

Use the right tools: a miter saw, tape measure, pencil, level, hammer/nail gun, and more
To nail a door trim, you need to ensure you have the right tools for the job. Here is a list of the essential tools you will need:
- A miter saw is essential for achieving precise cuts. If you don't have access to a miter saw, you can use a miter box with a handsaw.
- A tape measure is crucial for taking accurate measurements, ensuring a good fit for your door trim.
- A pencil is necessary for marking your measurements and cutting lines.
- A level will help you ensure that your installation is level and even.
- A hammer or nail gun is used for securing the trim in place. A nail gun can make the process faster and more efficient.
Additionally, you may find the following tools helpful:
- A combination square helps measure and mark the reveal, creating a consistent gap between the door jamb and the trim.
- A pry bar is useful if you're removing old trim. It helps to carefully pry off the old trim without damaging the wall or door frame.
- A caulk gun is used to apply painter's caulk, sealing edges and creating a smooth finish.
- Sandpaper is ideal for smoothing rough edges and surfaces, giving your project a polished look.
- Shims may be necessary to ensure a flush fit for your door trim.
- Wood filler is used to fill any nail holes or gaps, creating a seamless finish.
Having the right tools is the first step to successfully nailing a door trim. With these tools, you can measure, cut, and secure your trim with precision and ease.
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Measure the reveal and create a symmetrical appearance around the door
The reveal is the small gap between the edge of the door jamb (the frame from which the door is hinged) and the trim. The size and shape of the reveal can influence the overall appearance of the door and doorway. A rectangular reveal, for example, may be used for a door that needs to provide a secure seal, while a round reveal can offer a softer, more inviting look.
To create a symmetrical appearance around the door, you must carefully measure the reveal. Use a combination square to outline a consistent reveal of 1/8 to 1/4 inch around the entire door frame. These marks will be your guide for positioning the trim. Before installing the trim, ensure the jamb and wall are flush. If not, plane projecting jambs to be flush with the wall. For recessed jambs, use shims behind the casing to make it level with the wall surface.
When replacing existing trim, carefully remove the old trim with a pry bar, preserving the wall and door frame. After measuring and marking the reveal, hold a casing leg in place, checking how it meets the floor. If the floor is uneven, you may need to trim the bottom of the leg. Once you are satisfied, mark where the reveal on the jamb head meets the leg, and cut the leg. Repeat this process on the other side.
If the casing is to meet with miters, cut the legs using a miter saw set to 45 degrees. Cut one end of the casing head, starting with the left side if you are right-handed, and vice versa if you are left-handed. Hold the head in place on the jamb, aligning the cut with the reveal on the jamb leg. After nailing the casing to the jamb, use 6d or 2-inch nails to nail the casing legs to the wall.
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Secure the trim with finish nails, wood filler, and painter's caulk
When it comes to securing door trim, there are several tools and techniques to consider for a seamless finish. Finish nails, wood filler, and painter's caulk are essential components in this process.
Finish nails are available in 4d and 6d sizes and are specifically designed to secure door trim in place. When using finish nails, it is important to avoid nailing too close to the edges of the trim to prevent the wood from splitting. A general rule of thumb is to avoid nailing within a quarter of an inch from the side edges and keep at least an inch away from the edge of the moulding.
Wood filler, which is distinct from caulk, is used to fill in nail holes and gaps. For stain-grade trim, opt for a wood filler that closely matches the natural colour of the wood. Allow the filler to dry completely before sanding it down to create a smooth and flush surface.
Painter's caulk is another crucial component in sealing the edges of the trim and creating a seamless finish. It is important to note that caulk should not be used on miters or nail holes, as it is not intended to fill in gaps or holes.
When securing door trim, it is recommended to use a nail gun or pneumatic air compressor nail gun with a gauge of 16 or 18 to attach the trim to the door jamb. Nails should be placed at 12-inch increments, and wood glue can be used to secure the corners. After nailing, use a nail set to drive the nail heads below the surface of the trim for a smooth finish.
By following these steps and using finish nails, wood filler, and painter's caulk, you can securely attach door trim while achieving a professional and polished look.
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Trim the back of the miter cut with a block plane, knife, or rasp
Trimming the back of the miter cut with a block plane, knife, or rasp is a crucial step in achieving a precise and seamless door trim installation. Here's a detailed guide on how to execute this step effectively:
First, select the appropriate tool for trimming. A block plane is a versatile option, allowing you to adjust the angle of the cut without requiring precise measurements until the final stages. Knives can also be used to mark and create accurate miter cuts, especially when reflecting the board to match angles. Wood rasps, such as Swedish wood rasps or a big Italian rasp, are another option for quickly removing excess material.
When using a block plane, start with the plane at the short part of the miter and move towards the long part, angling it towards the back of the casing. This technique helps prevent tear-out and creates a smoother finish. A few passes with the block plane should be sufficient to refine the joint.
If you're using a rasp, follow a similar approach, moving from the short to the long part of the miter. This direction reduces the risk of grain tear-out and helps achieve a cleaner cut.
For those opting for a knife, ensure you have a sharp blade. Mark the desired angle by drawing a line with the knife, then tilt the saw until the reflection on the blade aligns with the continuation of the board. This method ensures that your cut matches the desired angle.
By carefully trimming the back of the miter cut with these tools, you can fine-tune your door trim installation, ensuring a precise and professional finish. Remember to take your time and work gradually to achieve the desired results.
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Use wood glue and brads to secure corners and connect pieces
When installing door trim, you can use wood glue and brads to secure corners and connect pieces. This method will ensure a strong bond and a seamless finish. Here's a step-by-step guide:
First, apply a generous amount of wood glue to the surfaces that will be joined. Spread the glue evenly, ensuring that it covers all the areas that will be in contact. Wood glue will act as a strong adhesive and will also fill any small gaps, creating a smooth finish.
Next, carefully position the pieces that you want to join. Hold them firmly together, ensuring that the corners align perfectly. Check that the pieces are level and flush against each other, creating a seamless corner.
Now, use 1-inch brads to pin the pieces together. Drive the brads from the top and side, at a slight angle, to securely fasten the pieces. Space the brads at regular intervals, approximately 12 inches apart. The brads will provide additional strength and stability to the joint.
After nailing, be sure to wipe away any excess glue that may have squeezed out. Use a damp cloth to gently remove any glue residue, ensuring a clean and tidy finish. Allow the glue to dry completely according to the manufacturer's instructions.
Finally, once the glue is dry, you can fill any remaining nail holes with wood filler. Choose a filler that closely matches the natural colour of your wood trim. Allow the filler to dry, and then sand it flush with the surface of the trim for a smooth and seamless finish.
By following these steps, you'll create a strong and durable joint between the trim pieces, ensuring that your door trim is securely fastened at the corners and along connected pieces.
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Frequently asked questions
You will need a hammer or nail gun, finish nails (4d and 6d sizes), wood filler, painter's caulk, sandpaper, a miter saw or miter box with a handsaw, a tape measure, a pencil, a level, a combination square, and a pry bar.
First, outline the reveal (the small gap between the door jamb and the trim) using a combination square to mark a consistent reveal of 1/8 to 1/4 inch around the door frame. Then, use a nail gun or pneumatic air compressor nail gun with a gauge of 16 or 18 to attach the moulding piece to the door jamb with trim nails. To prevent splitting the wood trim, avoid nailing a quarter inch from the side edges and 1 inch from the edge of the moulding.
After the casing has been nailed to the jamb, change to 6d or 2-inch nails and nail the casing legs to the wall. Be careful around the joints—if the casing doesn’t sit tightly to the wall, shim behind it before nailing.











































