Decking Screws | Stainless Steel Deck Screws

Stainless steel decking screws for timber decking

High-quality decking screws provide a strong, durable and neat fixing for timber decking boards. Intergard offers professional stainless steel decking screws specifically designed for installing wooden decks, terraces and other outdoor timber structures. Features such as a strong shank, drill point, milling ribs and Torx drive make installation quick and controlled while providing a secure fixing.

Our deck screws are suitable for a variety of timber species and decking projects. They can be used for hardwood decking, Douglas decking and pine decking.

Stainless steel is particularly suitable for outdoor fixings because it offers significantly better resistance to moisture and corrosion than ordinary untreated steel. Depending on the application, decking screws are available in different sizes and stainless steel grades, including A2 and A4 stainless steel. A2 is suitable for many general outdoor applications, while A4 offers greater corrosion resistance for more demanding environments.

Why use specialist decking screws?

Outdoor decking is exposed to rain, moisture, temperature changes and changing weather conditions throughout the year. Timber also naturally expands and contracts as its moisture content changes. The fixings therefore need to withstand both outdoor conditions and the natural movement of the decking boards.

For this reason, we recommend using purpose-designed stainless steel decking screws rather than ordinary screws or nails. Decking screws are designed specifically for fixing decking boards and provide a strong connection between the board and the supporting substructure.

Stainless steel: corrosion-resistant and suitable for outdoor use
Strong shank: designed for secure fixing of decking boards
Drill point: helps the screw penetrate the timber efficiently
Milling ribs: help the screw head sit neatly in the timber
Torx drive: provides excellent grip and efficient torque transfer
Neat finish: allows the screw head to sit flush with the decking surface
Versatile: suitable for various hardwood and softwood decking applications
Professional quality: suitable for professional deck installers and DIY projects

Decking screws for hardwood decking

Choosing the correct screws is particularly important when installing hardwood decking. Dense tropical hardwood species such as Bangkirai, Kapur and Massaranduba place greater demands on fixings than many softer timbers.

Intergard offers several hardwood options, including Bangkirai decking, Kapur decking and Massaranduba decking.

Even when using self-drilling decking screws, we recommend pre-drilling dense hardwood decking. Pre-drilling reduces the risk of splitting and makes it easier to position and drive the screw accurately. Use a suitable hardwood drill bit with a diameter smaller than the screw being installed.

How many decking screws do I need?

For traditional face-fixed decking, a useful guideline is approximately 35 to 40 decking screws per m². Alternatively, allow approximately 8 screws per linear metre of decking board. The exact number required will depend on the width of the boards, joist spacing, board length and installation method.

With supporting joists or hardwood construction beams spaced at approximately 400 mm centres, each decking board crosses several support points. For traditional face fixing, two screws are generally used where each board crosses a supporting joist.

Decking screw quantity guide

Per linear metre of decking board: approximately 8 screws
Per m² of decking: approximately 35–40 screws
Per board-to-joist fixing point: generally 2 screws
Extra allowance: order approximately 5–10% extra for spare fixings

Example: how many decking screws for 20 m²?

For a 20 m² deck, using a guideline of 35 to 40 screws per square metre:

20 m² × 35 screws = 700 decking screws
20 m² × 40 screws = 800 decking screws

You should therefore allow approximately 700 to 800 decking screws for a 20 m² deck. We recommend ordering an additional 5–10% as a reserve. For a more accurate calculation, use the actual board width, board length, joist spacing and layout of your deck.

A2 or A4 stainless steel decking screws?

Whether you should choose A2 or A4 stainless steel decking screws depends largely on the conditions in which the deck will be installed. A2 stainless steel is suitable for many standard outdoor decking applications. A4 stainless steel offers greater corrosion resistance and is therefore more suitable for demanding or highly corrosive environments.

A2 stainless steel: suitable for many standard outdoor decking applications
A4 stainless steel: offers greater corrosion resistance for more demanding environments

When selecting a decking screw, also consider the timber species, board thickness, substructure and required screw length. For other outdoor timber projects, see our range of stainless steel screws.

Torx decking screws for fast and secure installation

Professional decking screws are often supplied with a Torx drive. The star-shaped drive provides excellent contact between the driver bit and screw head, allowing torque to be transferred efficiently. It also helps the bit remain securely positioned while the screw is being driven.

The combination of a Torx drive, drill point and milling ribs makes professional decking screws particularly suitable for repetitive installation work. For other timber fixing applications, Intergard also supplies Torx chipboard screws.

How to install decking boards with decking screws

Prepare the substructure: position the supporting joists at the required centres and make sure the structure is stable and level.
Allow the correct board spacing: leave sufficient gaps between the boards for drainage, ventilation and natural timber movement.
Position the decking boards: align each board carefully before fixing it in place.
Mark the fixing points: for face-fixed decking, two screws are generally used where each board crosses a joist.
Pre-drill hardwood: pre-drilling dense hardwood helps reduce splitting and makes accurate installation easier.
Drive the screws straight: use the correct Torx bit and keep each screw as straight as possible.
Set the screw head correctly: finish the head flush with or just below the surface without driving it unnecessarily deep into the timber.
Check the finished deck: inspect the fixings, board spacing, stability and drainage once installation is complete.

Choosing decking screws for different decking materials

A durable deck depends on more than just the screws. The decking boards, supporting structure and fixings must work together as a complete system. Explore our full range of decking to find suitable boards and accessories for your project.

For traditional timber decks, Intergard supplies options including hardwood decking, Douglas decking and pine decking.

We also supply composite decking. Composite decking systems often use a different fixing method from conventional timber decking. Many systems are installed with dedicated clips positioned between the boards rather than screws driven through the visible surface. Always follow the installation requirements for the chosen decking system.

Decking screws or hidden fixing clips?

The correct fixing method depends on the type and profile of the decking board. Traditional timber decking is commonly face-fixed using stainless steel deck screws. Suitable profiles may also allow the use of a concealed fixing system for a cleaner surface.

Composite decking is commonly installed with purpose-designed fixing clips. These clips can help maintain consistent spacing between boards while keeping the fixing out of sight. Always use a fixing system that is compatible with the selected decking boards.

Buy decking screws from Intergard

Looking to buy decking screws for a new timber deck or to replace existing fixings? Intergard supplies professional-quality stainless steel decking screws in a range of sizes and grades for both professional installers and DIY projects.

You can combine your decking screws with the boards and substructure required for a complete decking project. For other timber construction and fixing jobs, browse our range of fasteners.

Frequently asked questions about decking screws

What screws should I use for decking?

For timber decking, use purpose-designed outdoor decking screws. Stainless steel decking screws offer good corrosion resistance, while the correct screw length, diameter and stainless steel grade should be selected to suit the board thickness, timber species and substructure.

How many decking screws do I need per m²?

For traditional face-fixed decking, approximately 35 to 40 decking screws per m² is a useful general guideline. The exact number depends on board width, joist spacing and the chosen fixing method.

How many decking screws do I need for 20 m²?

At 35 to 40 screws per m², a 20 m² deck requires approximately 700 to 800 decking screws. It is sensible to order an additional 5–10% for spare fixings.

Should hardwood decking be pre-drilled?

Yes. Pre-drilling is recommended for dense hardwood decking because it reduces the risk of splitting and makes it easier to position and drive the screws accurately.

Should I use A2 or A4 stainless steel decking screws?

A2 stainless steel is suitable for many standard outdoor applications. A4 provides greater corrosion resistance and is a better choice for more demanding or corrosive environments.

Why use Torx decking screws?

A Torx drive provides good contact between the driver bit and screw head, allowing efficient torque transfer and reducing the tendency of the bit to slip while driving the screw.

Can I use ordinary screws for decking?

Purpose-designed decking screws are preferable for an outdoor timber deck. They are designed for fixing decking boards and dealing with outdoor conditions. Stainless steel also provides better corrosion resistance than ordinary unprotected steel screws.

How many screws should I use per decking board?

With traditional face fixing, two screws are generally used wherever the decking board crosses a supporting joist. The total number of screws per board therefore depends on the length of the board and the spacing of the joists.

How deep should decking screws be driven?

The screw head should normally finish flush with or only slightly below the surface of the decking board. Avoid driving the screw too deeply, as this can damage the timber and create a recess where water can collect.

Can I use decking screws for composite decking?

This depends on the decking system. Many composite decking systems use dedicated fixing clips rather than screws driven through the visible face of the board. Always follow the installation instructions for the specific decking system.