If the frame you already have is sound and only the panel is gone, you are looking at installing an interior door slab<\/a> instead. The full installation sequence, from choosing a format to hanging the slab, is in the how to install an interior door<\/a> guide.<\/p>\n Most frame problems begin with an assembly or positioning mistake that shimming cannot undo, so this section keeps the frame movable until its geometry is right.<\/p>\n A frame has five working parts, and understanding which one carries load prevents you from shimming the wrong piece.<\/p>\n Some frames arrive preassembled with the stop attached. Others come as separate jambs and stop moldings. Check the manufacturer’s instructions before cutting anything, because the order of assembly changes the way you brace and shim the frame.<\/p>\n Choose jamb stock that matches the wall thickness. A standard 4-9\/16 inch jamb fits a 2×4 wall with drywall on both faces. A 6-9\/16 inch jamb suits a 2×6 wall. If the wall is thicker than the frame, the casing will not sit flat, and no clever installation can hide that mismatch.<\/p>\n The hinge jamb matters most because it supports the door’s weight and carries every hinge. If it leans, the door leans with it. The strike jamb can move slightly as the head is adjusted, but a crooked hinge jamb distorts the entire assembly. Where the window and door family is mapped as a whole, see our buying guide<\/a>.<\/p>\n Check the hinge jamb with the level at the top, middle, and bottom. A straight reading at one point can still hide a bow. This is where a little patience saves an afternoon of trimming later.<\/p>\n The diagonal test catches the twist that a carpenter’s square can miss, especially after the frame has been tacked into a rough opening.<\/p>\n Measure from the top left corner of the frame to the bottom right corner. Then measure from the top right corner to the bottom left. If the numbers differ, the frame is out of square.<\/p>\n Do not chase this by eye. Measure the opening first:<\/strong> measure from the hinge jamb to the head at the top and bottom. The gap that differs tells you which corner needs to move.<\/p>\n Shim the head jamb behind its lower corner if the hinge side is short, or behind its upper corner if the strike side is short. Small movements are enough. Recheck the diagonal after every adjustment.<\/p>\n The frame should also be checked for twist across its depth. Look down the opening from above. If one side projects farther than the other, the frame is twisted, and a flat casing will expose it.<\/p>\n Shims do not merely fill gaps. They transmit the fastener load from the jamb into the wall, so their position matters more than their size.<\/p>\n Put shims behind the jamb where the fasteners will enter, including near each hinge and at the strike location. A shim in an empty corner may look tidy while doing nothing.<\/p>\n Use tapered cedar or wood shims with the taper pointing toward the jamb. Build a tapered pack by sliding one shim deeper than the other so their outer faces are parallel. Drive them together gently, then check for movement.<\/p>\n The right spot is where you will drive the fastener. Shimming the wrong location moves the problem:<\/strong> adding a shim at the middle of an already bowed jamb can force one end out of plumb instead of correcting it.<\/p>\n For larger gaps, stack opposed pairs. Drive each pair in opposite directions so the shims lock against each other and do not rock. A loose shim pack can split later and let the frame move.<\/p>\n Score protruding shims with a utility knife and snap them off. Do not hammer them, since that can split the shim or damage the jamb edge behind the casing.<\/p>\n A frame that is correctly shimmed but poorly anchored will still move, and a moving frame makes a door that will not close.<\/p>\n Fasten through the jamb, through the shim, and into the framing. If a fastener misses a stud, add backing or blocking rather than tightening it into thin air. Keep fastener heads proud while adjustment continues, then set them after the final checks.<\/p>\n Brace the head jamb so the frame cannot be pushed out of square while the rest of the job proceeds. A simple diagonal brace from a stud to the head works for a basic interior opening. A purpose-built door clamp can hold the assembly while you work and is less likely to mark finished surfaces.<\/p>\n Place braces where they will not obstruct the casing, the door swing, or later wall finish. The brace should restrain the frame, not distort it.<\/p>\n After bracing, make the same three checks again:<\/p>\n The casing is not merely decoration. It hides the installation gap and leaves a clean shadow line around the door, but it must be wide enough to cover the joint without disguising the frame.<\/p>\nThe Rough Opening Decides Everything, So Start There<\/h2>\n
Know the Parts Before You Set the Frame<\/h3>\n
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Why the hinge jamb comes first<\/h3>\n
Square the Frame with Diagonals, Not by Eye<\/h2>\n
Shim at the Fasteners, and Build the Pack Properly<\/h2>\n
Fastening Through the Shims, Then Bracing the Head<\/h2>\n
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Covering the Joint Without Hiding a Mistake<\/h2>\n