Introduction

Building a deck is one of the most popular DIY projects for Australian homeowners — but choosing the right fasteners is where many builds go wrong.

The right bolts and fixings will:

• Keep your deck structurally sound
• Prevent movement and squeaking
• Protect against rust and weather damage

This guide breaks down exactly what you need — without the confusion.

What fasteners are best for building a deck?

The best fasteners for building a deck are galvanised or corrosion-resistant bolts and screws, with structural bolts used for load-bearing connections and coach screws or bolts used for timber framing.

Where Fasteners Are Used in a Deck

A typical deck uses fasteners in several key areas:

• Bearers and joists (structure)
• Ledger board (connection to house)
• Posts and supports
• Decking boards

? Each area requires a different type of fastener

? Structural Connections (Posts, Bearers & Joists)

These are the load-bearing parts of your deck — don’t cut corners here.

What to use:

• Galvanised structural bolts 
• High tensile bolts (for heavy-duty connections)
• Nuts and washers

? Browse Structural Bolts
? Shop Hex Bolts & Nuts 

Why it matters:

These connections carry the weight of your deck — and everyone on it.

? Timber Connections (Framing & Supports)

For timber-to-timber connections:

What to use:

• Coach bolts
• Coach screws
• Timber-specific fasteners

? Shop Coach Bolts 
? View Timber Fasteners 

Tip:

Always pre-drill timber to avoid splitting.

?️ Outdoor Protection (THIS IS CRITICAL)

Decks are exposed to:

• Rain
• Humidity
• Temperature changes

You MUST use:

• Galvanised bolts
• Zinc-coated fasteners
• Outdoor-rated fixings

? Browse Galvanised Bolts & Fasteners 

⚠️ Using standard bolts outdoors will lead to rust and failure.

? Decking Boards (Top Layer)

What to use:

• Decking screws (corrosion-resistant)
• Hidden fastener systems (optional)

⚠️ Common Deck Building Mistakes

Using Indoor Fasteners Outdoors

Leads to rust and early failure.

Not Using Bolts for Structural Areas

Screws alone are not enough for load-bearing sections.

Mixing Fastener Types

Different metals can cause corrosion over time.

Choosing the Wrong Size or Grade

? Read: Bolt Grades Explained

✅ Simple Deck Fastener Checklist

Before you start, make sure you have:

• ✔ Structural bolts for posts and supports
• ✔ Coach bolts for timber framing
• ✔ Galvanised fasteners for outdoor durability
• ✔ Decking screws for boards

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