How To Install Door Trim?


Described as the trim around a door opening, the interior door casing is the trim around the bottom side of a door.

Basic doorway casings are made up of just three separate pieces two long trim pieces on either side of the door frame topped with a shorter piece (the head casing) to complete the frame. All You Need to Know About Doorway Casing is “How to install door trim?”

Three pieces of trim are enough to make a room look great and enhance its architecture. Get the inside scoop on how to buy and install decorative casing before you start decorating any interior doors or doorways. Interior door casing is the term used to describe the trim found around a door opening.

The term interior door casing refers to the trim around a door opening. The basic doorway casing consists of three pieces: two trim pieces on each side of the door frame and a shorter piece (the heads casing).  Door casings enhance the architectural beauty of your room by setting the tone.

Tools required how to install door trim?

Following  tools are must require for this process:

  1. 4-in-1 screwdriver
  2. Combination square
  3. Coping saw
  4. Drill bit set
  5. Drill/driver – cordless
  6. File
  7. Glue
  8. Hammer
  9. Miter saw
  10. Nail set
  11. Putty knife

What materials are required for door trim?

  1. 3d finish nails
  2. 4d finish nails
  3. 6d finish nails
  4. 8d finish nails
  5. Wood putty
  6. Wood trim

We’ll explain the fundamental steps to put in extensive molding around a door or window, including mitered corners. We’ll also demonstrate how to install an encased baseboard that is a combination of three kinds of moldings.

How to install door trim?

There are Nine easiest ways to install a trim door

1: Get The Measurement Of The Opening Width:

  • If you’re interested in knowing how to install trim on your door begin by measuring the width of the opening. For this, walk towards at the very top, and determine the width.
  • Once you have the measurement of your answer, add 3/8” inches to your final. This helps to put the reveal of 3/16” around The frame of The door . Even if experts suggest this show as a great option, you are able to select a different one that will meet your requirements for door opening.

2: Slice Off The Top Door Casing:

  • A few people employ this method, However, it’s effective. Begin by working from the upper end of your trim. This technique will help you achieve the perfect fitting and the perfect edges.
  • If you are learning to cut the opening of a cased door and you’ll notice that the top part of the door is cut at a 45-degree angle on both sides. In the case of the bottom, it’s the same size that you calculated from the measurements you took during the initial step. If you’re able to measure a width of 28 inches, you’ll cut the width at 28-3/8”.
  • Cut one edge of the casing stock until it is at an angle of 45 degrees. This is the point at which there’s no need to measure the length of the piece. Cut the edge of the piece in order to avoid any waste.
  • Measure from the lower end in the cut 45 degrees. Then trace how long the upper portion is (in this instance, 28-3/8). ”). Because you aren’t able to connect the ends of the tape measure to the miter, you’ll have to be careful. Keep the tape in place or use the drywall. Because the marking will be on the outside of the tape, it is essential to cut it with care.
  • If you are learning to cut the door’s opening, you’ll require a manual miter box for cutting requirements. This amazing tool is able to cut precisely without leaving behind sawdust. It is also possible to maintain the cleanliness of your space by using a sheet of plastic to collect any particles. In addition to the miter box, can be used for making cuts.
  • Make sure the door casing is aligned with the back of the door and the wide edge of the trim is on the fence. Make sure to secure the trim to the miter box using clamps that are small. It is also recommended to employ one hand to control the saw, while the other holds an eye on the box’s place. Alternately, you can put the miter box with the clamp on the work table.

On the other hand of The door Follow the steps above. For a perfect shape take the first top piece you worked on before to serve as a reference.

3: Dry Fit The Upper Trim:

  • After adjusting the dimensions that the upper trim is, make sure to check whether it is a good fit. You should allow a 3/16” gap from the bottom of the door to allow for an opening and place it in the middle of the opening. It’s not necessary for precise measurement. Therefore, just take a look carefully, and then secure it by using the clamp of 6 inches.
  • When you dry-fit your trim, it’s normal to have uneven surfaces on the edges of the drywall. If you encounter such spots, smooth them using sandpaper or cut them down to ensure that the trim is the proper size. 

4: Work On The Side Trim:

  • Do not measure your side trim when you are done. You can instead grab a long piece or trim and turn it to face you. The thick part of the flipped trim is placed against the upper trim and the lower goes to the floor.
  • Now align the long trim piece with the top trim. Mark the area where the free trim touches its counterpart at the top with a pencil.
  • Move the mark toward the front. You will need to mark the path that the miter must follow in order to avoid any mistakes. This will allow you to make the cut.
  • Fit the trim to your side. You can now adjust the top and sides to ensure that everything lines up properly. After you have it in place, secure the side trim.
  • Do a test fit with the side trim. Adjust the sides to ensure it fits properly. Keep the team in place, and clamp it down. Next, repeat the steps for the other side of the trim.

5: Fix The Door Casing:

  • Make three pieces from the door casing. Cut them to size. This ensures a perfect fit. Use a clamp to secure the pieces and then nail them.
  • This can be accomplished with a nail gun. For this step, you can use a regular nail gun. Next, insert the nail head in the trim using a nail tool.
  • Choose 18-gauge or 5d finish nails for the trim’s inner side. Fix the trim to the frame with 16 gauge nails once you have reached the thicker end.

Then, trim the opposite side of your wall using the above steps.

6: Seal And Paint The Edges:

  • It’s now time to finish the job. Start by applying latex caulk, which you can then paint over. This material should be applied at the junction of the trim and the door.
  • Seal any gaps and nail holes that you cannot get with your miters. Once the caulk has dried, you can begin to paint the seal.
  • To paint the interior door trim pieces, you’ll need primer. If you are interested in interior door trim styles with a natural wood appearance, you can swap out the paint for a staining agent. You should first coat the wood with an oil-based primer or latex-based primer.

 7. Fit the head on this leg:

  • It is important to test fit the head on this leg. It is possible to make adjustments to the cut. A block plane, knife, rasp, or razor can often be used to trim the back of the miter. This will allow you to close a partially open miter.

8. Apply glue on joint:

  • Apply glue to the joint. Secure the head with a nail along the reveal line.

9. Press the joint tight, and nail it from the side:

  • If necessary, adjust your cut at the junction of the second leg and the casing head.
  • Attach the casing legs by using a 6-D or 2-inch nail if you have attached the casing securely to the jamb. Pay attention to joints. Do not nail the casing legs to the wall if it isn’t snugly fitting against the jamb. Predrilling your top nail will help to avoid this issue when hand nailing. Keep the top of the casing head from being nailed to walls. Seasonal changes in humidity cause the framing to move upward and downward. If the casing is attached to the framing below, it too will move. The joints will crack.

What are four main styles of door casings, including a farmhouse, craftsman, minimal, and colonial?

1. Farmhouse:

Your home will feel cozy with farmhouse-inspired door casings. Simple, straight lines are the hallmark of farmhouse design. There is little or no ornamentation. Whitewashing, staining, or applying dark colors to farmhouse-style door casings can give a room character and depth.

2. Craftsman:

Craftsman door casings have simple but striking details that will add style and purpose to your home. The craftsman-style door casings have a strong quality and are handcrafted. They complement and unify exterior elements. For a craftsman-style home that has depth and texture, you can paint the door casings in creamy neutral tones or dark colors.

3. Minimal

The minimally designed door trim creates a clean, simple look that doesn’t overwhelm the space. Modern or industrial decor styles can be used in conjunction with minimal trim to give contemporary rooms a sophisticated, open feeling.

4. Colonial

Colonial-style door casings are simple and elegant, adding warmth and comfort to your home. They can be used to make low-ceiling rooms feel larger and more feminine by adding simple, elegant beads (small indented lines), and cavetto curves (concave).

5. Butted vs. Mitered

The easiest way to install the three casings on a doorway is to place the thinner edge of the board towards the inside of your frame. This reduces bulk and increases the doorway’s width. You can either connect the ends of the head casings to the tops of the side casings using butted or mitered joints.

  • Butted Joints: The butted joints are used to connect two flat surfaces at 90 degrees. They are usually made with glue or nails. Traditional butt joints link flat board casings with the head casing on top. Because of the flexibility offered by butted joints, architects are more inclined to use them when designing high ceiling homes. You can also add character and interest with decorative corner blocks.

  • Mitered Joints: Mitre joints consist of cutting both the tops and sides of the head casing at a 45-degree angle and fitting them together to create a 90-degree angle. Mitre joints create a neat, clean joint in wood.

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The Feature Writer at Healthy Talks, Khadija, has written hundreds of how-to and troubleshooting pieces on a variety of topics. She is a former Associate Editor for Healthly Talks magazine and has previously written for the Iowa Source and educational marketing websites. Khadija holds a bachelor's degree in science and an associate's degree in education with a concentration on curriculum development.


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