Baltic Birch Plywood: Sizes, Grades and Uses

Baltic birch plywood is plywood made entirely of birch veneers, thin and of equal thickness, glued with almost no voids. It has more plies than ordinary plywood (13 in an 18 mm sheet), so it is stiffer, holds screws better and shows a clean striped edge. It usually comes in 5 × 5 ft (1525 × 1525 mm) sheets and metric thicknesses.

Thicknesses and plies

Thickness	Plies, nearest inch size and sheet weight (5 × 5 ft)
3 mm	3 plies, about 1/8 in, about 5 kg (11 lb)
6 mm	5 plies, about 1/4 in, about 10 kg (22 lb)
9 mm	7 plies, about 3/8 in, about 15 kg (33 lb)
12 mm	9 plies, about 1/2 in, about 19 kg (42 lb)
15 mm	11 plies, about 5/8 in, about 24 kg (53 lb)
18 mm	13 plies, about 3/4 in, about 29 kg (64 lb)
24 mm	17 plies, about 1 in, about 38 kg (84 lb)

Baltic birch grades

Grade	Face
B	Nearly clear, uniform colour; a few small pin knots.
BB	Sound face with neat, colour-matched oval patches. The usual furniture face.
CP	Patches not colour-matched, small knots and minor discolouration: for paint or hidden faces.
C	Open defects allowed: knot holes, splits. Shop use only.

Baltic birch vs regular birch plywood

Ordinary birch plywood has a birch face veneer over a core of poplar, softwood, MDF or particleboard, with fewer, thicker plies. Baltic birch is birch all the way through, with thin plies of equal thickness. It costs more but is stiffer, has fewer voids, and its edge looks good enough to leave exposed.

Advantages

Birch all the way through: stiff, strong and almost void-free
Holds screws and joints well, even near edges
Attractive layered edge that can be left exposed
Flat and stable, with a smooth, hard face

Drawbacks

More expensive than softwood or MDF-core plywood
Often sold in 5 × 5 ft sheets, which waste more on 8 ft parts
Faces may have football-shaped patches (BB grade)
Birch can blotch when stained

What it is used for

Drawer boxes with exposed edges
Cabinet carcasses and shelves
Jigs, templates and shop furniture
Laser cutting and CNC (3–6 mm)
Toys, speaker boxes and small furniture

Tips for working with Baltic birch plywood

Measure the real thickness: 3/4 in Baltic birch is 18 mm (0.709 in), so dadoes need a metric or undersize bit.
Plan your cuts on 5 × 5 ft sheets, not 4 × 8: the layout is different.
Use a pre-stain conditioner or gel stain to avoid blotching.
Sand the edges and finish them with the faces; they are part of the look.

Frequently asked questions

Why is Baltic birch plywood 5x5?

It is made in 1525 × 1525 mm sheets, the width of the birch veneers it is peeled into, so most Baltic birch is sold as 5x5 ft sheets. 4 × 8 sheets also exist.

What is Baltic birch plywood?

Plywood made only of birch veneers, from the Baltic region and Russia, with thin, even plies and almost no voids. It is stiffer and stronger than ordinary plywood of the same thickness.

What size are Baltic birch sheets?

Usually 5 × 5 ft (1525 × 1525 mm). Some suppliers sell 4 × 8 ft (1220 × 2440 mm) and 5 × 10 ft sheets.

How thick is 3/4 Baltic birch?

18 mm, or 0.709 in, a little under 3/4 in. Baltic birch is made in metric thicknesses: 3, 6, 9, 12, 15, 18 and 24 mm.

Is Baltic birch good for cabinets?

Yes, it is one of the best: strong, stable and good at holding screws and hinges. Many builders use it for drawer boxes and hardwood-faced plywood for the visible carcasses.

What do the grades B/BB and CP mean?

They describe the two faces. B is nearly clear, BB has neat colour-matched patches, CP has patches and small knots, and C allows open defects. B/BB is the usual furniture grade.

Furniture plans to build

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