Quck answer
To replace an interior prehung door, follow these steps:
1. Measure the existing door to determine the size of the replacement door.
2. Remove the trim and casing around the current door.
3. Unscrew and remove the hinges connecting the door to the frame.
4. Carefully detach the door from the frame and remove it.
5. Install the new prehung door by aligning it with the frame and using shims to ensure it is level and plumb.
6. Secure the door to the frame by screwing in the hinges.
7. Reattach the trim and casing around the new door.
8. Test the door to ensure it opens and closes smoothly.
The most efficient way to replace an interior door is by using a prehung door. Unlike slab doors, prehung doors come installed on a jamb, which forms part of the door frame, and supports the door. You do not have to measure and cut hinge mortises, a task that is easy to mess up, but you have to remove the old jamb from your doorway before installing the new one.
If you are replacing a prehung or non-prehung door, French doors, bifold doors, or closet doors, you have to unhang them first before removing the old door jamb.
Tip:
Before purchasing a new door, take accurate measurements of the old one. Ensure that you buy the correct size to avoid buying a smaller or larger door than you need.
Overview of the Project
The prehung door assembly slides into a rough opening of the correct size, and you attach the jamb to the studs. However, getting the jamb level during installation makes the project complicated. Some people prefer to leave the door attached to the jamb throughout the installation, but it is easier to manipulate and straighten the jamb if you remove the door first by pulling the hinge pins. After installing the jamb, set the door back on the hinges and replace the pins, and the hinges will be in the correct position.
Before installing the new door, check the rough opening for square to ensure that the house has not settled. Take measurements at the top, middle, and bottom of the width and the left, middle, and right of the height. If the measurements differ by more than half an inch, consider adding furring strips to fill the gaps between the new jamb and the framing. Check the level of the header and floor and cut one jamb longer than the other if either slopes. The jambs should extend within half an inch of the finished floor, but if you plan to install new flooring, extend the jambs to the subfloor. You can later undercut them with a handsaw to get the exact length you need.
Materials Required:
-
Eye protection
-
Screwdriver
-
Hammer
-
Utility knife
-
Chisel
-
Pry bar
-
Reciprocating saw
-
Tape measure
-
Speed square
-
Circular saw
-
2 1/2-inch finish nails
-
2-foot level
-
Cedar shims
-
2 1/2-inch trim screws
-
1 1/2-inch finish nails
The necessary tools and materials for replacing an interior prehung door include nail set, wood filler, paint, paintbrush, sandpaper, and interior wood enamel.
To start the process, remove the old door by unscrewing the lockset and removing the barrel bolt. Tap out the hinge pins and remove the door casing by cutting the caulk and prying it off carefully to reuse it. Remove the door jamb by prying it out or cutting the screws with a reciprocating saw.
Next, separate the new door from the jamb by removing the plug and hinge pins. Cut the jamb to the proper height by measuring the door opening and subtracting 1 to 1 1/4 inches. Finally, install the new door by attaching the hinges and securing the jamb with screws or nails.
To install a door jamb, first measure the distance from the header jamb to the bottom of the side jamb on one side of the doorway. Use a speed square to scribe a perpendicular line across the jamb and cut along the line with a circular saw. If the floor and header are level, cut the other jamb to the same height. If not, take a separate measurement for the opposite jamb. Next, move the jamb into the doorway, making sure the hinge and strike jambs are on the proper sides. Lift one of the side jambs to the top of the doorway, align the sides flush with the walls on either side of the doorway, and partially drive a 2-inch finish nail about 6 inches from the top to temporarily hold it in place. Repeat on the other side. Put a 2-foot level against the top jamb and check the bubble. If it is centered, go to the next step. If not, remove the nail from the side jamb on the higher side, move that jamb down to center the bubble, and re-drive the nail. Plumb the hinge-side jamb first by setting a level against it and moving the bottom as needed to center the bubble. Set shims behind the jamb a few inches below the bottom hinge and partially drive a nail to hold the shims in place. Repeat the process for the strike-side jamb. Hang the door on the hinges, replace the hinge pins, and open and close the door to make sure it doesn’t stick and the gaps between the sides and top of the door are even. Secure the jambs by driving pairs of 2 1/2-inch finish nails or trim screws at roughly 18-inch intervals along both side jambs. Finally, install the door trim by nailing the door casing around both sides of the door frame using pairs of 1 1/2-inch finish nails arranged side by side at 18-inch intervals.
Step 11: Cover Nail and Screw Holes, Smooth and Coat with Paint
Use wood filler to cover all nail and screw holes, let it dry, and then smooth out the jamb and casing. Use a paintbrush to apply your preferred interior wood enamel. If the door is still hanging, you can paint it while it’s up, or you can paint it separately on a pair of sawhorses.
Step 12: Set Up Door Hardware
Either reuse the old doorknob or lockset or install new hardware of your choice. If it’s a privacy door and you want to install a latch or deadbolt, you can do so now.
FAQ
1. How do I measure for a replacement prehung door?
To measure for a replacement prehung door, start by measuring the height and width of the existing door frame. Measure the height from the top of the frame to the bottom, and the width from one side to the other. Be sure to measure both the interior and exterior dimensions. Additionally, measure the thickness of the door jamb. These measurements will help you find the right size prehung door to replace the old one.
2. What tools do I need to replace an interior prehung door?
To replace an interior prehung door, you will need a few basic tools. These include a tape measure, a level, a screwdriver, a hammer, a chisel, a utility knife, a drill, and screws. You may also need a pry bar or a crowbar to remove the old door and frame. Having these tools on hand will make the installation process much easier.
3. Can I install a prehung door myself, or do I need professional help?
Installing a prehung door can be a DIY project if you have some basic carpentry skills and the right tools. However, if you are not confident in your ability to complete the installation properly, it is recommended to hire a professional. A professional can ensure the door is installed correctly, providing a proper fit and functioning properly. Additionally, they have the expertise to handle any unforeseen issues that may arise during the installation process.
4. How long does it take to replace an interior prehung door?
The time it takes to replace an interior prehung door can vary depending on your skill level and the complexity of the project. On average, it can take anywhere from 2 to 4 hours to complete the installation. This includes removing the old door and frame, preparing the opening, installing the new prehung door, and making any necessary adjustments. It is important to allocate enough time for the project to ensure a proper installation.
5. Are there any tips or tricks for replacing an interior prehung door?
When replacing an interior prehung door, it is helpful to have a few tips and tricks in mind. Firstly, make sure to carefully remove the old door and frame to avoid damaging the surrounding walls. Secondly, take the time to properly align and level the new prehung door before securing it in place. This will ensure a proper fit and smooth operation. Lastly, be patient and take your time during the installation process to ensure a professional-looking result.