Birch Plywood

What birch plywood is

Birch plywood is made from thin layers of birch, each about 1.4 mm thick, glued together with the grain of each layer running across the one below it. There is no chipboard or softwood in the middle. That is worth checking when you compare prices, because a lot of sheets sold as birch plywood are only birch on the outside, with a cheaper core hidden in between.

Solid birch throughout gives you three things. It is dense, so it holds screws far better than most sheet materials, including screws driven into the edge of the board. It stays flat. And the edge is a neat stack of stripes that many people now leave on show instead of covering up. It is heavy, though: an 18 mm sheet in 2440×1220 mm weighs 36.4 kg, a good deal more than softwood plywood the same size, which is worth knowing before you work out how to get it home.

Birch plywood grades: what BB/BB means

Every sheet we carry is graded BB/BB. The two letters describe the front and the back, so BB/BB means both faces are held to the same standard. A BB face can have small tight knots and neat oval patches where a knot has been cut out and plugged, but it will not have open holes, splits or gaps. In practice you get a smooth, sound surface on both sides that takes paint, varnish or oil, with the odd patch visible.

You will also see EN 13986 and EN 314-2 on the label. The first is the European standard for boards used in building work, and the second covers how well the glue holds up in damp conditions. Between them they tell you this is a proper structural board for indoor use.

Choosing a thickness

Birch plywood comes in eight thicknesses from 4 mm to 30 mm, and the right one depends on whether the board is a lining, a part in its own right or a structure. Work from the job rather than the number:

Thin sheets for backs and panelling

Thin sheets for drawer bottoms, cabinet backs and panels that sit inside a frame. 4 mm is the lightest at 8.1 kg a sheet, so you can carry it, get it into a car and cut it on your own, and it will bend to a gentle curve straight off the sheet. 6 mm, at 12.1 kg, is stiff enough to fix to battens on a wall without a solid backing behind it, which is why it is the usual choice for panelling.

Drawer boxes and small cabinets

Here the board becomes a part in its own right rather than a lining. 9 mm, 18.2 kg, is the standard for drawer boxes, because you can screw drawer runners straight into the edge and they hold. 12 mm at 24.3 kg suits small cabinets, boxes and seat bases, and it is the thinnest board whose edge looks deliberate when you leave it showing.

Cabinet carcasses and doors

These are the cabinet thicknesses. 18 mm is the one to default to, because nearly all cabinet hardware is designed around it: a concealed hinge seats properly in it, the long assembly screws used at cabinet corners reach full depth without bursting out through a face, and shelf pin holes at the usual 32 mm spacing leave material on both sides. A sheet is 36.4 kg. 15 mm does most of the same jobs at 30.4 kg and gives a few more millimetres inside each cabinet, but it is tight for heavy hardware.

Worktops, benches and long shelves

Thick boards for worktops, benches, stair treads and shelves that have to span without a rail underneath. 24 mm is also deep enough to round over or chamfer the edge itself, which shows the layers as a curve rather than a flat stack. Both are heavy: 48.6 kg at 24 mm and 60.7 kg for the 30 mm sheet, so plan on two people and a clear route in.

Sheet sizes

Most of the range comes in 2440×1220 mm, the standard 8×4 sheet. The 15, 18 and 24 mm boards also come in a large 1550×3050 mm sheet, roughly five foot by ten.

The longer sheet is worth paying for on anything floor to ceiling. A standard room height fits in one piece, so there is no cross joint halfway up a run of panelling or a tall cupboard, and that joint is the part that opens up as the house moves and shows through paint in side light however carefully you fill it.

The extra width earns its price a different way. A 1220 mm sheet rips to two pieces just over 600 mm, which is under the depth of a base unit once you allow for a worktop overhang. The wide sheet rips to two just over 760 mm, so deep units, wide shelving and desk returns come off it without a joint and without a wasted strip. The 18 mm wide sheet weighs 57.8 kg and takes two people, but it often works out cheaper than the 8×4 once you count the offcut you would otherwise throw away. The same sheet comes in 15 mm at 48.1 kg and 24 mm at 77.0 kg.

Cutting it

The face layer is thin and birch is hard, so the thing to watch for is chipping along the cut. Use a blade with plenty of teeth and keep the good face upwards on a table saw or a plunge saw and rail, since the blade comes up through the board from underneath. Score the line with a sharp knife first on any edge that will be seen. If you are routing, a compression bit is worth buying for this material: it pulls the top layer down and the bottom layer up, and leaves both faces clean in one pass.

Drill a pilot hole before putting a screw anywhere near an edge. Birch holds edge screws better than almost anything else, but without a pilot the screw will still split a glue line, and you often cannot see the damage until the joint moves months later.

Finishing it

Birch is one of the few boards worth leaving on show. A clear hardwax oil is the usual choice and gives a warm tone that deepens over the first year, while a water based varnish keeps it much paler, closer to the colour it is when new. Whichever you use, do the edges as well as the faces, because the exposed layers soak up finish much faster than the flat face does and end up looking dry and patchy if they get the same number of coats.

If you are painting, seal the face with a thinned coat of primer or shellac before priming properly, or the grain will show through the topcoat. And for painted flat panels with no visible edge, standard MDF paints beautifully and needs no grain filling.

How much does birch plywood cost?

Birch plywood price follows thickness and sheet size: each step up in thickness adds birch layers, and the wide 1550×3050 mm sheet carries more board than an 8×4. The fair comparison is the cost per usable piece rather than per sheet, because the wide sheet can save a whole extra board on deep units. Enter your area in the calculator on the product page to see how many sheets you need, and the cart adds the matching extras automatically.

Birch plywood vs marine, hardwood faced and flexible plywood

Birch plywood is the board for indoor work where the face or the edge is on show. For anything outdoors, in a wet floor or in a bathroom, choose marine plywood, which is bonded to stay together when it gets wet. Where the board will be hidden behind tiles, laminate or a painted front, hardwood faced plywood is the everyday structural sheet. For a tight curve, flexible plywood bends where birch will not, and where a fire rating has been specified, fire retardant plywood is the board to order.

Birch plywood in Dublin and across Ireland

We stock the full birch plywood range in our Dublin warehouse, for collection or delivery across Ireland. A 4 mm sheet fits in most cars, an 18 mm sheet is a two person lift, and the 24 and 30 mm boards need two people and a clear route in. If you are matching a run of units, order all the sheets for the job together so the faces come from the same batch. The rest of the range, and how the grades compare, is on the main plywood page.