Timber Frame Walls Perth

There’s a practical difference between a load-bearing wall and a partition wall, even though both use timber frames.

Load-bearing walls carry the weight of the structure above them. They hold up the roof, the upper floor, or the ceiling joists. You can’t just remove a load-bearing wall without supporting the load somewhere else. That usually means an engineer’s report and council approval.

Partition walls divide internal spaces. They don’t carry structural loads. They’re built to the same standards (straight, square, level, braced), but they’re not holding the house up. Removing or relocating a partition wall is simpler — no structural engineer required in most cases.

When we quote a job, we tell you which walls are structural and which aren’t. If you’re opening up a room or moving a wall, we’ll let you know whether you need an engineer before we touch anything.

Both types of walls start the same way: bottom plate, studs, top plate, noggings. The difference is what happens if you remove them.

In WA residential framing, you’re typically looking at treated pine or hardwood timber.

Treated pine (H2 or H3 grade) is the standard for internal framing and most external walls under a roof. It’s kiln-dried, chemically treated to resist termites and rot, and dimensionally stable. It’s also cheaper than hardwood. For partition walls and most load-bearing walls in a standard extension, treated pine is what we use.

Hardwood (usually jarrah or wandoo in WA) gets used in two situations: external bottom plates exposed to weather, and situations where the extra strength or durability matters (heavy roof loads, long spans, coastal environments). Hardwood is denser, heavier, and more expensive. It’s not the default choice, but it’s the right choice when the job needs it.

The studs are typically 90mm x 45mm (standard wall thickness) or 70mm x 45mm (thinner partition walls). We space them at 450mm or 600mm centres depending on the load and the span.

The timber arrives pre-cut or we cut it on site. Either way, it’s selected for straightness before it goes in the wall. Twisted or bowed studs create problems when you try to hang gyprock.

Timber framing follows a sequence:

1. Layout. We mark the bottom plate positions on the slab or floor. This sets the wall location. We check it’s square to the rest of the house and parallel to existing walls.
2. Cut and assemble the frame. Bottom plate, top plate, studs, noggings (horizontal bracing between studs), lintels over door and window openings. We build the frame flat on the ground or slab, then stand it up and brace it temporarily.
3. Plumb, level, and fix. We check the frame is plumb (vertical) and level (horizontal), then fix it to the floor and tie it to adjoining walls or ceiling joists. This is where the wall becomes part of the structure.
4. Bracing. Diagonal bracing or sheet bracing (plywood or similar) goes on to stop the wall racking (twisting under lateral load). AS1684 specifies how much bracing you need based on wind zone and wall length.
5. Services rough-in. Once the frame is up, electricians and plumbers run their cables and pipes through the studs. We’ve already marked safe zones for drilling and notching so services don’t compromise the timber strength.
6. Inspection. The building surveyor inspects the framing before it gets covered. If it passes, you move on to cladding (external) or lining (internal).

The framing stage typically takes 2-5 days for a single-room extension, longer for multi-room jobs. It’s not the slowest part of the build, but it sets the pace for everything after.