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25-49 50+ £149.86£179.83 £145.62£174.74 
21mm Birch Plywood Throughout B/BB 2440 x 1220mm (8′ x 4′) FSC®
Birch plywood is made from only Birch veneers. Inner veneers are thinner than outer veneers, glued and laid up in alternating directions to the required thickness. It thus provides a superbly consistent strong panel with known engineering characteristics.
£154.10£184.92 Ex VATInc VAT Add to cart -
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15-29 30+ £120.41£144.49 £114.08£136.90 
21mm Birch Core Brown Anti Slip Mesh Phenolic Faced Film Buffalo Plywood 2500 x 1220mm (8.2′ x 4′)
21mm phenolic resin impregnated film Buffalo board is pressed on both surfaces of the board under high pressure and temperature, smooth on one surface and a textured pattern is pressed onto the other.
Original price was: £133.88 Ex VAT (£160.66 Inc VAT).£126.75£152.10Current price is: £126.75 Ex VAT (£152.10 Inc VAT). Ex VATInc VAT Add to cart
Our specialist stores
Our specialist stores
21mm Plywood
21mm plywood is a practical thickness used across many trade jobs. This thickness is chosen when the sheet needs to stay firm and hold its shape. It feels stable in use and performs well in real builds. Plywood 21mm is often used where movement, flex or sag would cause problems later on.
What is 21mm ply sheet?
A 21mm ply sheet is built by pressing several thin wood layers together to form a solid 21 millimetre panel. It weighs more than thinner plywood, but feels much firmer in use. This thickness is commonly used when the board needs to support the build itself, not just cover it. Plywood sheets 21mm can come in different grades, cores and face finishes, but the behaviour stays the same. Strong. Dense. Built to handle pressure.
What is 21mm ply used for?
In furniture and joinery, 21mm plywood is used for carcasses that need to stay square. Wardrobes, built-in benches, storage units. It keeps panels straight and joints tight. Shelves made from ply 21mm are a good option when spans are wider and sag is a concern.
On site and in workshops, this thickness is used for worktops, platforms and lining panels that take daily wear. Tools, impact, repeated use. Thinner sheets show fatigue faster.
21mm plywood sheets are available in 2400x 1220mm, 2400 x 1200mm (8’ x 4’) and 2500 x 1220 (8,2’ x 4’). Boards are supplied with square edges or tongue and groove, depending on the application. The surface comes in a veneer finish, including smooth sanded veneer where required, as well as pressed paper or mesh pattern options, depending on the sheet. Sheets are lacquerable, paintable, and suitable for varnish or staining. 21mm plywood meets BS EN 636 Class 2 and Class 3. Moisture-resistant options are available. Formaldehyde level is E1. Grades include B/BB, with FSC-certified sheets where marked. Suitable for interior use, exterior use, and exterior applications where treatment is required.
Benefits of 21mm ply sheet
- Keeps fixings tight and secure, even with repeated use.
- Can reduce the need for extra framing or backing behind the sheet.
- Holds clean edges after cutting and machining.
- Performs consistently across larger panel sizes
- Reduces callbacks caused by movement or panel failure
- Suitable for builds where tolerance and alignment matter.
- A dependable option when the sheet is part of the structure, not a finish layer.
Why choose our 21mm thick plywood?
21mm thick plywood is stocked and supplied for projects where strength and consistency matter. At Sheet Materials Wholesale, this thickness is available to order online with clear pricing and no unnecessary steps. You can buy 21mm plywood online for both trade and DIY use, in single sheets or in bulk.
Stock is held in the UK, which allows for fast delivery on most orders. Lead times are clear at checkout, and kerbside delivery to site or home is available. Order tracking and VAT invoices are provided as standard.
At Sheet Materials Wholesale, you can purchase 21mm Plywood at low wholesale prices with fast nationwide delivery for most of items within 1-3 working days across the UK. Next-day delivery is also available on most orders. Competitive rates guaranteed.
FAQ
Where to buy 21mm plywood?
If you are looking for where to buy 21mm plywood in the UK, the easiest option is to order it online from Sheet Materials Wholesale. You can buy single sheets or bulk quantities, see prices straight away and get delivery to site or home. It suits both trade and DIY jobs.
How much does 21mm plywood weigh?
That depends on the type of plywood. 2440 x 1220 mm sheet of 21mm plywood usually weighs between 35 and 55 kg. Softwood plywood is lighter. Birch and hardwood plywood are heavier. It is a board that normally needs two people to handle safely.
How much weight can 21mm plywood hold?
21mm plywood can take a lot of weight, but it depends on how it is supported. With proper fixings and close joist spacing, it is commonly used for floors, shelves and furniture bases. Over longer spans, it will flex more than 21mm, so extra support or a thicker sheet is often the better choice.
