How to Fasten Molding to Plaster Walls

Molding gives a room a finished look while drawing attention to a ceiling’s architectural details. Plaster is composed of lime, an aggregate such as sand or cement and a bonding agent that is spread over concrete, drywall or a wooden base. The plaster itself is too weak to support the molding, so the studs underneath must be located to provide a more substantial base. Prepare and cut the molding before it is attached to create a clean, finished look.

Semi-gloss paint or polyurethane sealant
Skill saw
Miter saw
Stud finder
3-inch steel nails
Silicone caulk
Damp cloth

Instructions

- 1
  Measure the walls to determine the amount of molding required. Write down this figure and purchase the molding accordingly.
- 2
  Paint or treat the mold with a polyurethane sealant prior to cutting or hanging. Apply a semi-gloss paint to the molding and allow it to dry completely before continuing.
- 3
  Cut the molding according to the measurements taken in Step 1. Use a skill saw to create straight cuts and a miter saw to cut a 45-degree angle on the molding’s corner pieces.
- 4
  Hold the molding against the wall where it will be hung. Run a stud finder over the wall to locate the studs. Once the studs are located, attach the molding to the plaster with two, 3-inch steel nails. Drive one nail into the wall and the other into the ceiling joist.
- 5
  Continue to attach the molding until the job is complete. Examine the molding for any gaps between it and the wall. Fill the gaps with silicone caulk to create a seamless finished appearance. Wipe away any excess caulk with a damp cloth.

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