I have noticed that much of the exterior window
and door moulding (even window sills) on my house does not consist of a single pieces of wood. Rather each length of wood moulding/sill consists of smaller lengths of wood that have been "spliced" together with a type of dovetail joint.
I'm wondering why this is so. Economy? Or perhaps it was meant to make it theoretically possible to replace a small section of the moulding/sill when it begins to rot rather than an entire section.