Pre-1945Old-growth Douglas fir, solid pine, or oak
Colonial, craftsman, or custom millwork profiles. Typically 3.5 to 5 inches tall on baseboard. Non-standard by modern dimension.
Paint build-up over 80 years. Matching profiles require custom millwork sourcing or hand shaping. Never painted with MDF-compatible water-based paint - all oil-based historically.
1945 to 1965Solid pine or fir, sometimes primed
Simpler profiles than pre-war. Ranch-style ranch mold on baseboard. Door casings are typically colonial or clamshell.
High paint build-up. Profiles more commonly available at specialty millwork suppliers. Wood is solid and accepts new paint well after stripping or sanding.
1965 to 1985Solid pine or early finger-jointed pine
Ranch style flat-profile baseboard, colonial casings. Simpler than earlier periods.
Moderately available profiles. Paint is usually multiple coats of latex. Good candidate for clean-and-repaint if build-up is under 3/16 inch.
1985 to 2005MDF with wood veneer or raw MDF
Flat or simple profile. Colonial and clam-shell available at big box stores.
MDF does not accept paint the same as solid wood. Exposed MDF edges and cuts must be sealed before priming or the paint absorbs unevenly and raises a fiber texture.
2005 to presentMDF standard, primed from manufacturer
Colonial and craftsman available. Pre-primed makes field painting easier.
Standard installation. Pre-primed MDF still requires edge sealing at any field-cut end. Adhesion quality at miters depends on correct compound miter angle.