Millwork Definitions: “Standing and Running Trim”

When trim moulding (or molding) is ordered from a mill shop (and from some lumber companies), the customer can select either “standing” or “running” trim. There has always been confusion regarding the meaning of these terms in describing trim moulding, even in the construction business.  Many people think that running trim is any horizontal pieces, like crown moulding or baseboard.  And that standing trim is door casing, window casing or anything else that runs vertically.  When I did a simple Google search for a definition, it appears the misunderstanding is being perpetuated now on the internet.

Standing and running trim - The correct definition from CCM

Standing trim (moulding), is properly defined as pieces of trim moulding of specified lengths delivered to the job site.  Meaning that the builder had determined the exact sizes they need beforehand and placed an order that will minimize cutting and waste.  This commonly would be doorjambs, casings, window aprons, and any pre-machined trim as window stool, handrails, etc.  As standing trim is custom milled for lengths, prepare to pay a small premium for standing trim mouldings.  As standing trim eliminates job site waste, usually the small premium is offset by the savings in waste and certainly our landfills benefit from its use.

Running trim (moulding), is properly defined as pieces of  trim moulding of random lengths delivered to the job site. This commonly would be longer lengths up to 16 linear foot often used for baseboard, chair rail, crown mouldings, etc. Running trim moulding is the most economical way to purchase moulding. If you are installing a lot of moulding, a good carpenter can calculate and cut running trim to eliminate the need to purchase standing trim.

Please note that it is always best to try to order running trim in lengths that will work best for you. For example, a highly machined trim such as large crown should be ordered as intelligently as possible to eliminate unnecessary joints in the finished product. Please contact Central City Millworks with any questions with your trim moulding needs and our experts will help you decide the best combination of trim to order for your building needs.