• Decking Screws — for hardwood and composite decking, in a range of lengths, drives and grades.
• Coloured Screws — colour-matched to ModWood composite boards.
• Batten Screws — heavy timber-to-timber fixings.
• Cup Head Nuts and Bolts and Hex Head Nuts and Bolts — hot dip galvanised.
• Threaded Rod and Washers.
• KlevaKlip Connector Systems — concealed fixing for composite decking.

Not checking the frame material. Almost every fixing in this range comes in a timber version and a steel version, and they are not interchangeable.

A timber screw has a type 17 point or coarse thread that cuts into timber; a steel-frame screw has a drill point that goes through steel. A timber screw will spin on steel without biting. Confirm whether you are fixing to timber joists or a steel frame before you order.

Four things decide it: the decking material, the frame material, the board thickness and the exposure.

Our range covers 40mm, 50mm and 65mm lengths in 10 gauge, plus a SPAX 5×50 A2 304 stainless option, in a range of head and drive types.

As a rough guide the screw should penetrate the joist by about twice the board thickness. Tell us your board size and frame and we will confirm the length.

A wing screw has small wings under the head that ream a clean recess as the screw enters, then shear off as the thread pulls the board down.

In dense hardwood like Merbau this matters. Without it, the head has to bury itself in very hard timber, which tears the surface around the hole and can split the board near ends and edges. The BH142 40×10g is that type.

A screw with a moulded collar that sets the gap between boards as you drive it. We stock a 10G×50mm SS304 stainless option with spacers, in boxes of 500 and 1000.

The value is consistency. Getting an even gap across a whole deck by eye is slow and rarely perfect, and an uneven gap is the first thing people notice on a finished deck.

304 (A2) is the general outdoor stainless — clean, long-lasting and right for most inland decks. Our SPAX 5×50 and the 10G×50 spacer screws are 304.

316 is marine grade, for coastal and pool-side work. The BH109 65×10g is SS316.

If you are near the coast, a bayside suburb or an estuary, go to 316. The screws are a small part of the job cost and the hardest part to replace later.

Merbau is high in natural tannins. Where tannin meets an unsuitable fastener you get dark staining around every screw head, and it shows worst in the first few months on a brand new deck.

Use a stainless fixing rather than a plain or lightly coated steel screw in Merbau and other dense hardwoods. It is the cheapest insurance on the whole deck.

In dense hardwood, usually yes — particularly within about 100mm of a board end and near edges, where splitting is most likely.

Merbau is dense enough that a screw driven straight in can act like a wedge. Pre-drilling costs a little time and prevents split boards and snapped screws. Follow the fastener manufacturer's recommended pilot hole size.

Generally no. Composite boards need the fixing system made for that brand and profile.

Grooved boards are held by concealed clips that sit in the groove and set the board gap. Square edge composite boards are face fixed, but usually with a colour-matched screw made for composite.

Using the wrong fixing can affect board retention, spacing, appearance and the manufacturer's warranty.

They have a colour-matched head so the fixing disappears into the board instead of showing as a row of bright metal dots.

The coloured screws we stock are the ModWood range, in boxes of 100, matched to the ModWood board colours. There are separate timber-joist and metal-joist versions, plus a dedicated 305 stainless version for XTREME GUARD.

Because they are part of the ModWood system rather than a generic coloured screw, check both the colour and your frame material before ordering.

• KlevaKlip for 88mm ModWood and KlevaKlip for 137mm ModWood — concealed nylon clips, packs of 40. The clip is width specific, so match it to your board.
• KlevaKlip Snap-LOC for Trex Transcend — packs of 40.
• BH201 timber-joist and BH301 metal-joist screws for the ModWood clips, boxes of 350.
• Adjustable Joist Support Kit — a pedestal system for building level over concrete or a roof deck, boxes of 16.

Clips and clip screws are ordered separately. Forgetting the screws is the most common omission on a composite order.

Cup head bolts have a smooth domed head with a square shank underneath that locks into the timber as you tighten the nut. Clean appearance, nothing to catch on — the standard choice for exposed deck and pergola connections and for step treads.

Hex head bolts have a six-sided head driven with a spanner or socket. Better where you need to tension the connection precisely or the head will not be seen.

We stock both as hot dip galvanised bolts and nuts in M10 and M12, in lengths from 75mm to 200mm and beyond.

Add up the actual thickness of everything the bolt passes through, then allow enough thread past the nut.

Measure the timber rather than working from nominal sizes — a 45mm joist is not always 45mm. If you are between two lengths, take the longer one; excess thread can be cut but a short bolt is useless.

Yes — under every nut, and under a hex head where it bears on timber.

Without one, the nut crushes into the timber as it is tightened, which damages the timber and lets the connection go loose as the timber moves. The washer spreads that load over a much larger area.

We stock M10 hot dip galvanised washers and an M12 hot dip galvanised heavy duty washer. Use the heavy duty washer where the load is higher or the timber softer.

Where a standard bolt will not do the job — a connection deeper than any available bolt length, a through-connection across several members, or a tie-down made up on site.

We stock galvanised threaded rod in M12 and M16, in 600, 1000, 1200, 2440, 3000 and 3600mm lengths depending on diameter. Cut to suit, with nuts and washers at each end.

Buy the length above what you need rather than joining two rods. A coupled rod is only as good as the coupling, and that is not where you want the weak point in a structural connection.

Heavy timber-to-timber connections a decking screw is too light for — battens to framing, screening frames, pergola members, fence rails and general outdoor construction.

We stock 14G×75mm and 14G×100mm Class 3 galvanised bugle batten screws in packs of 500. Pick the length so the screw properly penetrates the member behind, and pre-drill near ends in dense hardwood.

A self-adhesive tape run along the top of each joist and bearer before the decking goes down. We stock tesa JoistSeal in 50mm and 100mm widths, in 20m rolls.

Every decking screw makes a hole in the top of the joist, and every one of those holes lets water sit in the timber. The tape seals around the fastener and sheds water off the joist instead.

It is cheap, it goes on in an hour, and the frame is the part you cannot replace without pulling the whole deck up.

Avoid it. Putting dissimilar metals in direct contact in a wet outdoor connection accelerates corrosion of the less noble metal — a galvanised bolt through a stainless bracket, for example.

Keep a connection to one material family: stainless with stainless, galvanised with galvanised.

Yes. The screws come in boxes of 200, 250, 350, 500, 600 and 1000 depending on the product, batten screws in packs of 500, and the composite clip screws in boxes of 350.

For larger decking, pergola, fencing or construction projects, contact us about trade pricing and availability.

Yes. Tell us your decking board and brand, the board thickness, your frame material, the joist centres, the deck area, and whether the site is coastal.

That is enough for us to specify the screws or clips, work out the quantities, and make sure nothing gets left off the order.

Browse the full Decking Wood QLD range of fasteners, decking, structural timber and hardware.