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This video c covers 2 distinct styles of applying molding to arched windows. The first part of the video covers molding size selection and installing molding inside of the window arch. The second part of the video shows you several methods for installing molding on the outside of the window arch. Skip to the 2:36 mark for the outside molding instructions.

Written Instructions

Material & Tools Needed

Hammer / Finish Nails / Nail Set / Brad Gun
Miter Saw / Miter Box
Adhesive / Caulking Gun
Tape Measure / Pencil
Caulking (paintable latex)
Sandpaper- Medium Grit
Utility Knife
Paint / Paint Brush

Getting Started

Get started by removing your old molding using a chisel and hammer. Scrape off any extra caulking with your chisel. Make sure the surface where you will be applying the molding is smooth and clean.


Paint your baseboards and allow them to dry before you start installation. Touch ups can be done once your installation is complete.

Measuring & Cutting

A quick way to measure is to hold the molding against the wall in position and mark it with a pencil on the side of the molding that touches the door jamb. You will typically want to leave 1/8" of the door jamb exposed.

When joining 2 sections together in a straight run, use a scarf joint instead of a butt joint. A scarf joint is cutting the ends at a overlapping 45 degree angle. This creates a stronger joint and allows for a little movement for alignment.

Securing The Casing to the Wall

Before mounting the molding to the wall, apply a 1/4" bead of polyurethane adhesive to all sides of the molding where it will contact the wall. It is also good practice to put adhesive where the moldings connect at the top of your doorway. You can use any adhesive that is rated for use with polyurethane (check the back of the label) -- we have had great success using Red Devil Construction Adhesive, Loctite's Powergrab and PL Premium Polyurethane Adhesive, all of which work well and are readily available at most home improvement stores.

Use small finishing nails or a powered brad gun to secure the molding while the adhesive sets. Make sure to use a nail punch to sink your finish nails below the surface. If you are using a powered brad gun, adjust the power so that the gun drives the brads just below the molding surface.

Now that you have all of your molding installed, spend a little time with some latex painter's caulk and fill in all those little seams and nail holes. Run a bead of caulk around the entire job to make it look nice and neat. Latex painter's caulk cleans up with water and is very easy to smooth out with your finger. Touch up the paint as needed.

Need More Help?

Let us know what we can help you with. We've been doing this for quite a long time and we'd love to help you in any way we can.

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