How to Prepare JAMB Door Jamb Questions

The Joint Admissions and Matriculation Board (JAMB) conducts the Unified Tertiary Matriculation Examination every year for aspiring students. The exam is used to determine whether a candidate will get admitted into their desired university. JAMB is dedicated to maintaining the integrity of their exam and does not repeat questions from previous years. However, candidates should still prepare with past questions to familiarize themselves with the exam format and topics.
The jamb is a frame that surrounds the doorway opening in a house. It has several parts, including the stop, sill, and threshold. Choosing the right size of jamb for your door can be difficult. Luckily, there are many online resources available that can help you determine the right size for your needs.
For interior doors, the jamb is typically finished separately from the door and installed on-site. Depending on the installation location, the installer may need to add shims to ensure a proper fit. In exterior doors, the jamb is often pre-hung and includes a non-adjustable stop cut into solid wood or Q-Lon weatherstrip that is inserted into a kerf in the door frame’s trim.
To calculate the correct jamb width, you must first determine the wall thickness. This will include the thickness of the metal studs and sheetrock. Typical wall framing is 2x4 or 2x6 studs with 5/8" or 1/2" sheetrock. The jamb width should be equal to or slightly larger than the wall thickness.
Once the jamb is positioned in the opening, use a level to verify that it is plumb and square. If the jamb is not square, shims can be added to the middle and lower strike side of the jamb. Once the shims are in place, use a level to verify that they are even across the top of the jamb. Once the reveal is even, secure the jamb with additional finishing nails.
jamb past question should also be placed in the hinge side of the door. Once the shims are in, close the door and check that there is an even space between the door and jamb along each side (this is called the reveal). If not, the reveal can be adjusted by adding or subtracting shims as needed.
Once the jamb is positioned in the rough opening, verify that it is plumb and square. Using a 6’ level, place it on the face of the strike side of the jamb. Adjust the middle and lower strike side shims until the bubble on the level is exactly in the center. Then, test the hinge side of the jamb for plumb and square. Depending on the application, the door may need to be shimed on both sides to achieve a perfect fit. For instance, if the door will be latch-only or deadbolt only, Sun Mountain offers a single bore or double bore machining option for the edge of the strike to accommodate either type of hardware.