Jamb Moulding

Jambs moulding is one of those quiet finishing details that completely changes the look of a room. Installed along the inner edge where the wall meets the door or window frame, it covers uneven drywall seams, protects corners from wear, and brings a polished sense of structure to your interior.

What is Jamb Moulding?

The jambs moulding is a thin trim that serves to cover the gap between a jamb and the wall surface. Without it, those edges often look somewhat rough or unfinished, especially after drywall installation. The moulding fills that gap and creates a nice, crisp transition that looks seamless from frame to wall.

It is most often made from high-quality wood, MDF, or PVC and can be painted or stained to match surrounding trim. What really makes this moulding distinctive, though, is that it's both strong and subtle: it reinforces corners that take more bumps from furniture and foot traffic yet keeps a clean, understated aesthetic. This trim does an equally great job in traditional homes with ornate casings or in modern spaces with simple, minimal lines.

Jamb Moulding Profiles

W-100 (Solid)

4-9/16" x 6'8", 7'0", 8'0"

W-102 (Solid)

4-13/16" x 6'8", 7'0", 8'0"

W-105 (Solid)

4-15/16" x 6'8", 7'0", 8'0"

W-110 (Solid)

6-9/16" x 6'8", 7'0", 8'0"

W-120 (Wood Core)

4-9/16" x 6'8"

W-122 (Wood Core)

4-13/16" x 6'8"

W-200 (Particle Board Core)

4-9/16" x 6'8"

W-202 (Particle Board Core)

4-13/16" x 6'8"

Jamb Moulding Wood Species

Oak

Maple

Poplar

Knotty Alder

Walnut

Where to Use Jamb Moulding

Door Frames

Hide gaps and seams where walls meet jambs to provide a smooth, finished edge around doors.

Window Frames

Cover rough drywall transitions and add a more refined border that complements your casings and sills.

Interior Openings

Add polish around cased openings or pass-throughs where drywall meets wood trim.

Built-Ins and Custom Woodwork

Finish cabinetry, shelving, or feature walls to continue consistent detailing in your interior.

Frequently Asked Questions

What is the purpose of jambs moulding?

It fills the small gap between the wall and jamb, creating a seamless, finished connection that looks clean and intentional.

Is it the same as casing?

Not quite. Casing outlines the outer frame, and then the jambs moulding completes the inner edge for a smooth visual transition.

Can I install it myself?

Yes, it is lightweight and easy to work with. It's perfect for do-it-yourself projects using basic trim tools.

Should it be painted or stained?

Either works. Paint blends with walls or casings while stain accentuates natural wood character.

Does every frame need it?

Not every opening requires it, but adding jambs moulding instantly brings a level of quality and makes your trim work look truly complete.

Connect with a Moulding Expert

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Types of Moulding Profiles

Choose Your Perfect Moulding Profiles

Casing

Used to frame doors and windows, casing moulding provides a clean transition between the wall surface and openings while adding architectural definition.

Base

Installed where the wall meets the floor, base moulding protects walls from impact and creates a finished, cohesive look throughout the room.

Crown

A decorative element installed where walls meet the ceiling, crown moulding adds depth, dimension, and elegance to any interior.

Jambs

Door jambs form the vertical and horizontal framework that supports a door within its opening, ensuring a precise fit and smooth operation.

Stop

Door stops are fitted within the jamb to control the door’s closing position, preventing damage and creating a snug, finished seal.

Base Shoe

A small, rounded trim piece installed at the bottom of base moulding to conceal gaps between the floor and wall, often used with hardwood or tile flooring.

Cove

Curved and smooth in profile, cove moulding is perfect for soft transitions between surfaces or as a decorative detail in cabinetry and ceilings.

Fire Casing

Specially designed to meet fire-resistance requirements, fire-rated casing provides both safety and a clean, consistent appearance around rated door openings.

Panel

Panel moulding adds depth and texture to walls or ceilings, ideal for wainscoting, feature walls, or creating custom architectural detailing.

Glass Stop

Used to hold glass securely within a door or frame, glass stop moulding ensures a safe, neat, and professional finish.

Miscellaneous

Additional trim profiles and specialty mouldings designed to meet unique design, installation, or restoration needs — available in a variety of materials and styles.