Timber vs Steel Frames: What's Better?

Choosing between timber and steel frames is an important decision when building a house or planning an extension. The frame supports the building and provides the structure for its walls, floors and roof, so the choice affects more than what happens during construction.

Both materials can produce a strong, durable home. However, they differ in cost, thermal performance, termite resistance, installation methods and how easily they can be modified.

Timber frames are generally straightforward to work with on site, relatively economical and less thermally conductive than steel. Steel frames offer a high strength-to-weight ratio, resist termite attack and do not shrink as they dry. The better choice depends on the design, location, construction system and project requirements.

For Perth homeowners, it is worth looking beyond claims that one material is always superior. This guide explains the practical advantages and disadvantages of both with perspective from professional carpenters.

What Is a Timber House Frame?

A timber frame is a structural framework made from appropriately graded timber members and their connections.

It can include wall studs, plates, floor joists, rafters, trusses and beams. Depending on the design, it may combine solid timber with engineered wood products.

Frames can be assembled on site or prefabricated and delivered in sections. The material grades, member sizes, bracing and connections must suit the loads and approved design.

The external appearance of a house does not necessarily reveal its frame. A timber-framed house can have various cladding systems, including brick veneer, fibre cement, timber or metal.

Advantages of Timber Frames

• Familiar construction methods and tools.
• Straightforward cutting and fitting on site.
• Flexibility for many renovations and extensions.
• Lower thermal conductivity than steel.
• Renewable material options from responsibly managed sources.
• Often competitive initial costs.

Disadvantages of Timber Frames

• Vulnerability to termite attack without appropriate protection.
• Moisture-related shrinkage, swelling and potential distortion.
• Risk of decay where persistent dampness is not addressed.
• Combustibility.
• A need for suitable grading, treatment and construction moisture management.

These considerations can be managed through correct specification and workmanship. They are not reasons to assume a timber frame will inevitably develop problems.

What Is a Steel House Frame?

Residential steel framing commonly uses light-gauge steel sections manufactured into wall frames, floor systems or roof trusses.

This is different from the heavier structural steel beams and columns used for particular load-bearing applications.

A house can contain both. For example, a mainly timber-framed home might use a structural steel beam over a large opening.

Light-gauge frames are often manufactured from detailed drawings and delivered ready for assembly. Installation relies on the specified connections, bracing, fixings and handling procedures.

Advantages of Steel Frames

• High strength relative to their weight.
• Resistance to termite and borer attack in the steel itself.
• No shrinkage caused by drying timber.
• Precise factory manufacture.
• Non-combustible framing material.
• Recyclability.

Disadvantages of Steel Frames

• Higher thermal conductivity.
• A need for appropriate corrosion protection.
• System-specific tools, fixings and installation methods.
• Potential complications where late changes require redesign or fabrication.
• Possible additional costs for thermal detailing and associated work.

A steel frame should be assessed as part of the complete construction system, including insulation, cladding and follow-on trades.

Which Is Stronger: Timber or Steel Framing?

Steel has a high strength-to-weight ratio, but that does not mean every steel frame is stronger than every timber frame.

Structural capacity depends on the complete design, including member sizes, spans, bracing, connections, loads and support conditions.

A correctly designed timber frame can provide the required strength for a house. A correctly designed steel frame can do the same.

What About Large Openings and Open-Plan Living?

Both systems can support open-plan designs when appropriately engineered.

The solution may involve engineered timber beams, structural steel, trusses or a combination of materials. The opening width alone does not determine the best option.

For a renovation, ask the designer or engineer how the loads will be supported and what the proposed solution means for ceiling heights, posts and foundations.

The aim is a suitable structure, rather than choosing the material with the strongest marketing claim.

Are Timber Frames Cheaper Than Steel Frames?

Timber is often economical for conventional residential framing, but there is no fixed price difference that applies to every Perth project.

Compare actual quotations for the same design and scope.

What Affects the Price?

Important factors include:

• Building size and layout.
• Engineering requirements.
• Wall heights and roof complexity.
• Material availability.
• Prefabrication and delivery.
• Site access and lifting requirements.
• Labour and installer experience.
• Insulation and thermal-break details.
• Fixings and service installation.
• Changes to the original design.

A frame supply price is not the same as the cost of a completed framing package.

Check whether the quotation includes erection, bracing, connection hardware, delivery, lifting and the relevant documentation.

Compare the Whole Build

A saving on the frame can be offset by extra work elsewhere.

Ask how each proposal affects cladding attachment, electrical and plumbing installation, cabinetry support and the energy-efficiency design.

A transparent comparison is more useful than an advertised percentage claiming one system is always cheaper.

Timber vs Steel Frames: Termite Resistance

Steel is not a food source for termites. This is a clear advantage for the steel members themselves.

However, a steel-framed house is not automatically termite proof.

Doors, trims, cabinetry and other timber components can remain vulnerable. Termite management also needs to consider how termites could enter and move through the building.

Can Timber Framing Be Used in Termite-Prone Areas?

Yes. Timber framing can be specified with appropriate treatments and termite-management measures.

The suitable approach depends on the design and site. Treatment of framing should not be confused with complete protection for everything inside the home.

For either frame type, retain the termite-management information, follow inspection requirements and avoid landscaping changes that conceal inspection zones.

The practical question is how the whole property will be protected and maintained.

Which Performs Better in Perth’s Climate?

Both materials can work in Perth. Their performance depends on the wall and roof assemblies around them.

Heat Transfer and Thermal Bridging

Steel conducts heat much more readily than timber.

Without appropriate detailing, steel members can provide pathways for heat to bypass insulation. This is known as thermal bridging.

Timber is less conductive, although timber members also affect the overall insulation performance of a framed wall.

Steel construction can manage thermal bridging through suitable thermal breaks, continuous insulation and other designed details.

Will a Steel-Framed House Be Hotter?

Not necessarily.

A well-designed steel-framed home can be comfortable and energy efficient. Equally, timber framing alone does not make a poorly designed house comfortable.

Orientation, glazing, shading, insulation, airtightness and roof design all contribute.

Ask how the proposed wall and roof systems perform as complete assemblies. The insulation batt’s labelled R-value alone does not describe the performance of the whole wall.

Moisture, Condensation and Durability

Both framing materials need protection from inappropriate moisture exposure.

Timber and Moisture

Timber responds to changes in moisture content. It can shrink as it dries or swell as it absorbs moisture.

Excessive or uneven changes can affect alignment, joints and finishes. Persistent dampness can also create conditions for decay.

Suitable timber selection, site storage, weather protection and checks before enclosure help manage these risks.

Steel and Moisture

Steel does not experience timber’s drying shrinkage, but corrosion protection and moisture control still matter.

Coatings, connections, compatibility with adjoining materials and separation from persistent moisture all need attention.

Both systems require careful leak prevention and condensation management. A concealed water problem should be investigated regardless of the material behind the wall.

Are Steel Frames Better for Coastal Perth Homes?

Steel framing is not automatically unsuitable near the coast, but the specification must suit the exposure.

Manufacturers may require particular enclosure details and construction measures in marine environments. Warranty eligibility can also depend on the site and installation.

For a coastal project, ask:

• Is the framing product suitable for this location?
• What measures protect it from salt-laden air and moisture?
• Which fasteners and connectors are specified?
• Are adjoining materials compatible?
• What conditions apply to the warranty?

Timber frames also need appropriate moisture protection, treatments and durable connections.

Choose a suitable complete system rather than assuming either material eliminates coastal durability concerns.

Timber vs Steel Frames in a Fire

Steel is non-combustible, while timber is combustible. However, this distinction does not establish the fire performance of an entire house.

Steel can lose strength and stiffness at elevated temperatures. A non-combustible frame does not make a building fireproof.

Timber-framed assemblies can achieve required fire resistance using appropriately designed protective linings and construction details.

What About Bushfire-Prone Properties?

Bushfire requirements involve the complete building, including external walls, roof details, windows, doors, vents and potential ember entry points.

The frame material is one consideration within that broader design.

Have the proposed construction checked against the requirements for the property. Avoid choosing solely on a claim that one frame material is “fire safe”.

Which Is Quicker to Build?

There is no automatic winner.

Both timber and steel frames can be prefabricated. A coordinated prefabricated package can reduce assembly work on site, but manufacturing and delivery need to be included in the program.

A frame that goes up quickly may still have a long lead time.

For either option, ask about:

• Design and engineering completion.
• Manufacturing time.
• Delivery and installation dates.
• Site preparation.
• Required lifting equipment.
• Coordination with following trades.

Late changes can affect both systems. Confirm windows, openings, fixtures and major service routes before manufacture wherever possible.

Which Is Easier to Renovate or Extend?

Timber is generally straightforward for carpenters to cut, fit and adapt on site. This can be useful when working with an existing house whose dimensions differ from the original drawings.

However, structural alterations still need assessment. Ease of cutting does not mean a member can safely be removed.

Steel-framed homes can also be renovated, but alterations may need system-specific engineering, replacement components and connection details.

Do not cut studs, trusses or structural members in either system without checking the requirements.

Fixing Cabinets and Heavy Fixtures

Both systems need appropriate support for heavy items.

Plan locations for wall-hung vanities, large cabinets, televisions and other fixtures before the walls are lined. Extra support or backing may be required.

Knowing what will be attached to the wall makes installation easier than trying to solve the support arrangement afterwards.

Can You Combine Timber and Steel Frames?

Yes. A design can use different materials where each suits the task.

Examples include timber wall framing with steel beams over large openings or a framed extension connected to an existing masonry house.

The junctions need careful coordination. Connections, load transfer, material compatibility and differences in movement must be addressed.

A mixed design should be an engineered solution rather than an improvised substitution on site.

Which Is More Sustainable?

Timber from responsibly managed sources is renewable and stores carbon during its service life. Its impact still depends on sourcing, processing, transport, treatment and end-of-life decisions.

Steel is highly recyclable, but its production also has environmental impacts. Recycled content and manufacturing methods influence the comparison.

Neither label tells the full story.

Consider the amount of material used, construction waste, durability, operational energy performance and opportunities for reuse.

A frame that supports a durable, efficient home is more useful than a material choice made from one environmental claim.

Which Frame Should You Choose?

Timber May Suit Your Project When:

• Competitive conventional framing costs are a priority.
• On-site flexibility is useful.
• You are altering an existing timber structure.
• Your construction team has strong timber-framing experience.
• Responsibly sourced renewable materials are important to you.

Steel May Suit Your Project When:

• Resistance to termite attack in the frame is a priority.
• A coordinated prefabricated system suits the design.
• You want to avoid timber’s moisture-related shrinkage.
• The design benefits from the selected system’s capabilities.
• The project team can deliver the required thermal and corrosion details.

Neither list replaces project-specific design advice. The best choice is the system that suits the property and can be delivered properly within the budget.

Frequently Asked Questions

Do Steel Frames Rust?

They can corrode if the protection, environment or detailing is unsuitable. Residential framing products use protective coatings, but correct installation and moisture management remain essential.

Do Timber Frames Warp?

Timber can distort as moisture conditions change. Appropriately specified seasoned timber, careful handling and good construction practice help manage movement.

Does Steel Framing Prevent Wall Cracks?

No frame material guarantees crack-free finishes. Ground movement, connections, material junctions and lining installation can all affect cracking.

Do Timber Frames Last as Long as Steel Frames?

Both can provide long service lives when properly designed, built and protected. There is no single lifespan that applies to every frame of either material.

Is Steel Framing Noisy?

Frame material alone does not determine indoor noise. Acoustic performance depends on linings, insulation, junctions, openings and the complete wall or floor assembly.

Can Either Frame Be Used With External Cladding?

Both can support various cladding systems, provided the fixings, support, moisture management and thermal details suit the chosen products.

Carpentry and Framing With Skyline Concepts

Timber and steel both have a place in residential construction. The important decision is how the selected framing system will support your design, suit the site and work with the rest of the building.

At Skyline Concepts, we provide structural framing and carpentry services across Perth for new builds, renovations and extensions.

We can discuss your carpentry scope and work with your builder, designer and engineer to deliver the specified framing and finishing details.

Contact Skyline Concepts to discuss the carpentry requirements for your Perth project.