Finishing & Installing Moldings

DIY How To - Molding
Installing wood trim and molding is a simple and inexpensive way to bring a finished look to any room. And, it can be accomplished in a few short steps with the right tools and a quality abrasive sanding product. 

 

1

Pick a style

Whether you’re installing window, door, or floor trim, the type of joint used on the molding will determine the cuts you make and how you connect them. 

  • Mitered Joint: Molding is joined at a 45 degree angle. This angled cut helps to hide the seams.

  • Butt Joint: Molding is joined at a 90 degree angle. This is the easiest type of cut, but seams are more visible.

  • Corner and Divider Blocks: These add a decorative element at corners and seams, making installation even easier and eliminating seam concerns. 
 

2

Cut the molding

While there are many different tools you can use to cut your molding to size, using a electric-powered miter saw will give you the cleanest finish. Miter saws allow you to easily make adjustments so that your tapered cuts fit together perfectly.
Measure the size of the molding you need. When in doubt, measure slightly longer – pieces that are too long can be adjusted, but those that are too short cannot be fixed. Put on your safety gear and make the cut.

 

3

Pre-drill the nail holes

Measure and mark out the nail holes on each piece of molding and pre-drill the hole. This will ensure that molding does not crack during installation. Nail guns are a new popular option as well.

 

4

Sand your workpiece

All molding is shaped to some kind of that profile leaving a wavy surface called chatter marks. To get the best surface finish, those chatter marks need to be sanded smooth prior to staining or priming. We recommend using a sanding sponge to complete this work as it will allow you to sand the flat surfaces, curved surfaces, and inside edges. Sand along the grain in long strokes until the molding is smooth to the touch.

 

5

Apply the initial coat of stain or paint

Complete the first stages of finishing before you install the molding. If you’re using stain, apply the top coat, or if you’re painting, apply the primer and first coat. 

 

6

Install and finish

Nail the molding to the wall, filling the nail holes with spackle for painted molding and wood filler for stained molding. Sand your workpiece again with a sanding sponge before applying the final coat to ensure a satin smooth surface. Apply the final coat of stain or paint and step back to admire your work.