Prehung Door Materials: MDF Core vs. Solid Wood vs. Hollow Core

Direct answer: Prehung door jambs are manufactured from finger-jointed pine (most common), solid pine, or MDF. Finger-jointed pine is the standard for painted applications. Solid pine or MDF is specified for stained applications. Jamb width must match wall thickness.

Prehung Door Jamb Materials: Finger-Joint Pine vs. Solid Pine vs. MDF

Finger-Jointed Pine Jambs

Finger-jointed pine is the industry standard for painted prehung doors. It is manufactured from short pieces of pine joined end-to-end, which:

• Eliminates warping (the joints prevent the wood from moving as a single piece)
• Accepts paint well (smooth surface)
• Costs less than solid pine

Use when: The door will be painted. This is the correct specification for 95% of new construction.

Avoid when: The door will be stained — the finger joints are visible through stain.

Solid Pine Jambs

Solid pine jambs are specified for stained applications. They are more expensive than finger-jointed pine but provide a consistent wood grain for stain.

Use when: The door will be stained or the client wants a natural wood finish.

MDF Jambs

MDF jambs are smooth and accept paint well. They are more moisture-sensitive than pine and are not recommended for exterior applications or high-humidity environments.

Hinge Specifications for Prehung Doors

FAQ

Q: What is finger-jointed pine?

A: Finger-jointed pine is manufactured from short pieces of pine joined end-to-end using interlocking finger-shaped cuts. It is more stable than solid pine and is the standard for painted applications.

Q: Can MDF jambs be used for exterior doors?

A: No. MDF absorbs moisture and will swell and deteriorate in exterior applications. Use solid wood or composite jambs for exterior prehung doors.

Q: How many hinges does a prehung door have?

A: Standard prehung interior doors have 2 hinges (doors up to 50 lbs) or 3 hinges (doors over 50 lbs). Heavy doors (solid wood, glass) require 3 hinges minimum.