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Herein, what is the best size for baseboards?
Most baseboards are 1/2 to 1 inch thick and 3 to 8 inches tall. Gauge baseboard size by its relationship to crown and casing. Baseboard is typically taller than casing is wide, and about as tall as the crown. The taller the crown, the taller the baseboard should be to maintain visual balance.
In this regard, is door casing thicker than baseboard?
Baseboards should always be at least two inches taller than the case molding is wide. Base blocks should be thicker than the casing and taller than the baseboard. For example, if your casing is 3/4″ thick the base block should be 1″ thick.
Five or six inches would be more in scale. If you are using beefier 3 ½ or 4 1/2-inch door trim, 8- or 10-inch baseboards are more appropriate. Keep in mind, also, that the outside edge of the door molding has to be deep enough to accommodate the thickness of the baseboard.