Stair Timbers

Welcome to our garde Timber Web site to inspect  our range of native and imported durable hardwood stair components to suit any budget for the DIY, trade or commercial application for both internal and external weather exposed application in both solid and Laminated Hardwood species.

Timber Stairs can be built with ‘open treads’, which is without risers, or ‘closed treads’ with riser boards. Open tread stairs are suggested for external use as they offer superior air circulations, allowing exposed timber to dry more quickly, subsequently improving resilience.

Single piece step treads are also available for single spine fabricated metal, stringers or galvanized steel stringers which are pre-fabricated. These are supplied docked to length and finished sanded for installation, polishing, oiling or painting.

As Garde Timber is a timber merchant, we only supply the separate raw material components and do not make up the staircase , house out the Stringers or fabricate the Steel Mono Stringers

External Hardwood Stair  Timbers

This is supplied in Class 1 durability Unseasoned Red Ironbark, which is naturally white Ant and termite resistant.

There is minimal shrinkage and end split, and can be sanded  oiled for a natural colour finish with our range of Sikkens or Intergrain external coatings.We do not dress these as maybe prone to surface checking in full sun and slippery when wet.

We do not supply stringers pre-housed.

Size  Species Grade Comment
250 x 50 mm Sawn Unseasoned Red Ironbark F17 (Stocked 1.8 – 4.2m ) Lengths to 6.0
300 x 50 mm Sawn Unseasoned Red Ironbark F17 (Ex-Sawmill) Lengths to 6.0 m

Internal  Hardwood Stair  Timbers

Our Internal Hardwood stair components are available in a range of Solid Timber and Glue Laminated option.

Solid Stair Components 

Species below are most common commercially high durability species available  – other species on request


*Blackbutt Hardwood Kiln Dried

240 – 290 x 35 mm or  240 – 290 x 45 mm

(Can be Ripped back in width to customers requested size eg 250 x 35 mm)

Structural Grade (with moderate natural feature Gum vein,insect pin holes and hairline cracks )  or Appearance Grade

Riser material  – 190 x 19 mm (Select Grade )


*Spotted Gum  Hardwood Kiln Dried

290 x 45 mm (Can be Ripped back in width to customers requested size eg 250 x 45 mm)

Structural Grade (with moderate natural feature)  or Appearance Grade

Riser material  – 190 x 19 mm (Select Grade )


*Merbau   Hardwood Kiln Dried

250 x 47 mm Pencil Round Edges

240 x 35  / 290 x 35 / 240x 45 / 290 x 45 mm

(Can be Ripped back in width to customers requested size eg 250 x 45 mm)

All Select Grade

Riser material  – 190 x 19 mm (Select Grade )


*American Red Oak

240  x 32 mm / 240 x 42 / 285 x 32 / 285 x 42

(Can be Ripped back in width to customers requested size eg 250 x 45 mm)

All Select Grade

Riser material  – 190 x 19 mm (Select Grade )


Laminated Stair Components 

With large solid sections of Hardwoods becoming scarce due to diminishing log girth, we are now offering more laminated solid hardwood step treads edge-glued to make up larger sections from smaller pieces of Timber. These are engineered with strength and extra stability in varied atmospheric conditions.

Available in  both Australian native hardwood and  imported . Our range of laminated internal stair timbers include:

Native Australian Hardwoods

Garde Timber currently have the following species available for internal timber stairs.

  • Blackbutt
  • Spotted Gum
  • Bluegum
  • Grey or Red Ironbark
  • Tasmanian Oak
  • Brushbox
  • Tallowood

The sizes range from 240 – 350mm wide x 32/42/60/90mm thick.

Solid Riser material is 190 x 19mm.

The grade of this timber is Select and comes in continuous length boards usually up to 4.8 metres.

Custom sizes can be made up from these standard sizes for Winders and Landings.

Check with our staff regarding lead times

 Imported Laminated Step Material

Merbau / Kwila

240  x 32 mm / 240 x 42 / 290 x 32 / 290 x 42  / 240 x 65 / 290 x 65 / 290 x 85 mm

Solid Riser material is 190 x 19mm.

The grade of this product is Select, with lengths up to 6 metres.

(Can be Ripped back in width to customers requested size eg 250 x 35 mm)

Our team is available to cut customs sizes from the standard sizes mentioned for applications including winders and platforms.


American Red Oak

240  x 32 mm / 240 x 42 / 285 x 32 / 285 x 42  – 2 Piece Lamination Solid or Finger Jointed

290 x 70 – 7 Laminations

Finger Jointed  up to 5.7 m lengths

Garde Timber Stair Material Services

Garde Timber can provide the following services for timber stair products:

  • Docking to length
  • Machining to non-standard sizes
  • Edge routing and finishing sanding
  • Attaching under side strips for compliance

Contact Garde Timber for a quotation on your timber stair requirements.