Picture Frame Moulding Profiles and Materials
Every piece of picture frame moulding has four parts:
- The face, the visible front surface. Smooth, beveled, fluted, ornate, or shaped to match a style.
- The lip, the inside edge that holds the glazing and mat in place from the front.
- The rabbet, the L-shaped groove cut into the back. The glazing, mat, artwork, and backing all stack inside the rabbet.
- The back, the flat surface that sits against the wall.
Rabbet depth matters most. A standard frame has a 1/4 to 1/2 inch rabbet, enough for glazing, mat, artwork, and backing. A canvas floater frame needs a 1.5+ inch rabbet to fit a stretched canvas. A shadow box needs a 1 to 3 inch rabbet for three-dimensional objects.
Common Moulding Profile Shapes
"Profile" is the cross-section shape you see when you look at the cut end of the moulding. The profile sets the visual style of the frame.
- Flat, straight rectangular face, no bevels or curves. Modern, minimal, gallery-style.
- Scoop, concave curve from face to lip. Pulls the eye toward the artwork. Common in contemporary and traditional frames.
- Cap, convex curve from face to lip. Rounded, soft, traditional.
- Stepped, multiple flat planes stair-stepping down to the artwork. Architectural and crisp.
- Beaded / fluted, small carved details running along the length. Decorative, traditional, ornate.
- Ornate / carved, heavily decorated profiles with foliage, scrollwork, or gilded detail. Baroque, gallery, museum styles.
Moulding Materials
Solid Wood
Basswood, ramin, ash, pine, oak. Strongest. Holds finish and gilding well. Industry standard for picture framing. Best for heirlooms.
Aluminum / Metal
Lightweight, modern, color options from satin black to brushed silver. Great for big frames and gallery walls. Will not warp.
MDF / Composite
MDF or polystyrene core wrapped in printed wood-grain foil. Most affordable. Less durable than solid wood. Good for posters and short-term displays.
Picking the Right Moulding Width
Moulding width is how wide the visible face is, measured side to side. The right width depends on the artwork size:
- Up to 11×14", 0.5 to 1 inch wide. Skinny moulding keeps the focus on the artwork.
- 11×14" to 16×20", 0.75 to 1.5 inches wide. Balanced for most family photos and certificates.
- 16×20" to 24×36", 1.25 to 2.5 inches wide. Enough visual weight to anchor a wall.
- 24×36" and up, 2 to 4+ inches wide. Wide moulding holds the proportion and provides structural strength on big frames.
The rule of thumb: as artwork gets bigger, moulding gets wider. A skinny moulding on a giant frame looks flimsy; a chunky moulding on a small frame looks crushing.
Picking the Right Moulding Depth
Depth is how tall the moulding stands off the wall, front to back. Depth controls what fits inside the rabbet:
- 0.5 to 1 inch deep, standard depth for photos, prints, and mats. Holds glazing, one mat, artwork, and a thin backing.
- 1 to 1.5 inches deep, double mats, thicker mounts, or shallow shadow boxes (patches, ribbons, dried flowers).
- 1.5 to 2 inches deep, stretched canvas in a float frame, medium shadow boxes (baseballs, medals).
- 2 to 3+ inches deep, deep shadow boxes (wedding bouquets, military caps, sports memorabilia).
Common Moulding Finishes
The finish is the color and surface treatment applied to the moulding face. Pick the finish to match the artwork mood and the wall it hangs on.
- Natural wood, clear coat over wood grain. Warm, organic.
- Stained wood, oak, walnut, mahogany, ebony stains. Traditional.
- Painted, matte or gloss black, white, primary colors. Modern, gallery.
- Gilded, gold or silver leaf over a primer. Ornate, formal, museum.
- Distressed, sanded, weathered, or rubbed finishes. Rustic, farmhouse, vintage.
- Brushed metal, satin or polished aluminum. Contemporary, clean.
Picture Frame Moulding FAQ
What is picture frame moulding?
Picture frame moulding is the long strip of shaped material, wood, metal, or composite, that gets cut and joined at the corners to make the four sides of a picture frame. The moulding has a routed channel on the back (called the rabbet) where the artwork, mat, and backing sit.
What is the rabbet on a picture frame?
The rabbet is the L-shaped groove cut into the back of the moulding. It is the recessed lip where the glazing, mat, artwork, and backing all stack inside the frame. The rabbet depth determines how thick a stack the frame can hold; the rabbet width sets the outside size of the artwork.
What is the difference between molding and moulding?
Nothing. 'Molding' (US spelling) and 'moulding' (UK spelling) are the same word. Both refer to the shaped wood, metal, or composite strip used to build a picture frame. American framers use both spellings interchangeably.
How thick should picture frame moulding be?
For artwork up to 16×20 inches, 0.75 to 1.25 inch wide moulding looks balanced. For 16×20 to 24×36, go 1.25 to 2 inches wide. For posters and large art (over 30 inches), 2 to 4 inch wide moulding holds visual weight and provides structural support. Always match the moulding scale to the artwork scale.
What is the best material for picture frame moulding?
Solid wood (basswood, ramin, pine, ash) is the framing-shop standard, strong, traditional, paintable. Aluminum moulding is lighter, modern, and good for big frames. MDF or composite moulding with a wood-grain wrap is the most affordable but less durable. For heirlooms, pick solid wood.
Can you make your own picture frame moulding?
Yes, with a router or moulding head you can shape raw wood stock into custom profiles. Most home framers buy pre-made moulding by the foot and just cut miters and join corners. The shaped profile is the hardest part to make at home.