If you are looking to replace a door, there are a lot of features that might make prehung doors the best option for you. Prehung doors are ideal for beginners. This is because they come with many features that make them easier to install than a slab door, like the hole for the doorknob and the fact that the hinges come already attached.
Another benefit is that you can be sure it will be well insulated, so that stress is also minimized. However, with prehung doors, you must also make sure your measurements are as accurate as possible to ensure that the door fits, and it is level.
Cut Around the Interior Casing
Use your utility knife to cut around and loosen the casing. Slide the knife between the casing and the wall until it is no longer attached. Be careful and be sure to take your time so you can try to minimize damage to the wall.
Once you have finished cutting around the casing, use your pry bar to make room for a shim, which will protect your wall from any damage as you move forward with the project. Now, you will use the pry bar to slowly and carefully pull the casing from the wall. First pull the casing from the left side. Then move to the right side and finally the top.
Measure the Width of the Door
You want to measure the width of the door three times. This ensures that you have the most precise measurement, and it accounts for anything that is imperfect or not level. To get these measurements just measure from one side to the other, and to get your final measurement, you will need to measure once at the top, once in the middle, and once at the bottom. Be as precise as possible with these measurements, and remember to use the smallest width measurement because it will ensure the best, snug fit and an easy installation.
Measure the Length of the Frame
Now, take the time to measure the frame’s length. Here, you will also take three measurements. First, you will measure from the top left corner of the frame, along the left side, to the bottom left corner on the floor. Then, you will use the same process to measure the middle and the right. Once you have all three measurements, you will use the smallest as your final measurement again. If there is much difference in these measurements, check the floor to see if it is uneven.
Measure the Jamb Depth
At this point, it is time to measure the jamb depth. This is basically the width of the wall, without any hardware, trim, or other materials. Generally, these measurements are either 4 9/16 inches or 6 9/16 inches. To properly measure the jamb depth, measure from the backside of the interior of the frame to the backside of the exterior of the frame. Make sure that you do not include anything that is not part of the door, like trim, in your final measurements.
Note Door Details
Now, note any details you will need to know prior to ordering a new door. Some of these details can affect your measurements and, if you are replacing your door, which door is the best for you to purchase. For instance, make sure you are considering any sweeps and are not including them in your measurements. Also, make sure you are not including any trim or other materials in your final measurements. Before ordering you might also want to consider if your current door has an inward swing or an outward swing. Is the door left or right facing? Check to see which side the hinges or knob are on. Ask yourself these questions and take note of the answers.
There are numerous reasons to choose to install a prehung door over a slab door, mainly the ease when it comes to installation. If you are planning to install a prehung door, you want to be sure you have the most precise measurements. You do not want to show up at the hardware store with the wrong measurements, or without having measured the correct parts of the door space.
Or if you decide to order a door, you do not want to wait around only to discover you ordered the wrong side. The best measurements will ensure that you order the correct sized door, and it is installed as easily as intended. Just be sure to follow these steps so that you have the best measurements and don’t have to waste time trying to install the incorrect sized door.