Sheet Material

(127 products)

At DIY Building Supplies, we stock a wide range of sheet materials to suit your projects, from structural, hardwood and marine plywood, to OSB, MDF and more, shop everything you need to get started on general and structural sheet material projects.


Frequently Asked Questions

Sheet Materials: MDF Board

A widely used product for DIY projects, our MDF board is ideal for creating built-in cupboards and wardrobes, shelving and board-and-batten style panelling, amongst millions of other uses! Shop our MDF boards in choice of 6mm, 9mm, 12mm, 18mm and 25mm thicknesses. 

Sheet Materials: Furniture Backing Board

Suitable for homemade furniture, use our furniture backing board to add a slim, neat finish to cabinets, wardrobes or DIY pinboards. 

Sheet Materials: Chipboard Flooring

Ideal for loft boarding, our tongue-and-groove chipboard flooring is moisture resistant and easy to install, in a choice 18mm or 22mm thicknesses. 

Sheet Materials: OSB and Flooring 

OSB or “Oriented Strand Board” is a type of engineered wood board made from small strands of wood adhered and compressed together to form a strong and sturdy board ideal for use in flooring and sheds. Though it appears similar to chipboard, the strands of wood are longer and more strategically placed, creating greater overlap of the strands which creates a stronger and sturdier board. Shop our range of OSB board - both standard and tongue-and-groove boards ideal for flooring and loft boarding. 

Sheet Materials: Plywood

We stock a wide selection of plywood sheets to suit virtually every building and DIY project. As well as general use plywood, we also stock a range of specialty plywood - from Structural ply in a choice of pine or hardwood, to shuttering ply and even marine plywood for more weather-resistant projects. Starting at 3.5mm spanning up to 25mm, choose the perfect plywood to suit any structural, formwork or home decor project.

What's the difference between OSB and plywood?

OSB (Oriented Strand Board) is made from compressed wood strands arranged in layers for strength. It’s typically more affordable than plywood and offers consistent performance without weak spots like knots. However, it can swell if exposed to moisture for long periods.

Plywood is made from thin layers of wood veneer with alternating grain directions for added strength. It often has a smoother finish and is available in decorative options, so it is ideal where appearance matters. Plywood also resists warping better and holds up well against moisture, especially marine-grade types.

Which sheet material is best for flooring?

For most domestic flooring, 18mm or 22mm tongue & groove chipboard is a reliable and cost-effective option. It's easy to install and strong enough for everyday use, with the 22mm thickness offering extra support for heavier traffic areas. OSB3 T&G boards (18mm) are a great alternative, providing solid load-bearing strength and a simple fit thanks to their interlocking edges.

For high-traffic or moisture-prone areas like kitchens, bathrooms, or utility rooms, structural plywood (18mm or 25mm) is the best choice. However, regardless of the material you use, always opt for moisture-resistant variants in these areas.

How do I calculate how many sheets I need?

To calculate how many sheets you need, start by measuring the total area in square metres (length × width). Then, work out the area of one sheet. For example, a standard 2440mm × 1220mm board covers 2.98m². Divide your total area by the sheet area to get the number of sheets.

It's best to add around 10% extra to account for wastage to help avoid delays if you make a mistake or need to trim boards to fit. For tongue and groove flooring or non-standard sizes, always calculate using the actual coverage per board.

How should I store sheet materials?

Proper storage helps maintain the shape and performance of your materials. Sheet materials should always be stored flat on a level surface to prevent warping or bowing. Use bearers to elevate the sheets off the ground, spacing them evenly at about 600mm apart and heavy sheets should go at the bottom of the stack, with lighter ones on top.

Keep the materials in a dry, covered area away from direct sunlight and rain. To protect from dust, cover them with a breathable material. Before installation, allow the sheets to acclimatise to the environment for 48 to 72 hours.

Can I cut sheet materials myself?

Yes, you can cut sheet materials yourself using the right tools. A sharp circular saw works well for straight cuts, and a jigsaw is good for curves. If you’re unsure or need accurate cuts, many timber merchants offer cutting services.