Steel Trusses vs Timber Trusses in Ghana: Which Is the Better Choice for Your Roof? (2026)
Last verified: March 2026 | Sources: Iridak Roofing Systems steel trusses product page (iridakroof.com/steel-trusses/, verified March 2026), Iridak Roofing Systems build guide (iridakroof.com/build-iridak-steel-trusses/, verified March 2026), Westcoast Roofing Ghana steel truss analysis (February 2026), TroySteelRoofing.com Ghana FAQ data (2025), Ghana Statistical Service construction sector report Q3 2025 | Location: Greater Accra, Ghana
Timber has been Ghana’s default truss material for decades. It is familiar to carpenters, available at most hardware yards, and cheaper at point of purchase than engineered steel. But the construction industry in Ghana is making a clear shift. Westcoast Roofing Ghana’s February 2026 analysis confirmed that G550 and AZ150 steel trusses are becoming the industry’s preferred structural specification, displacing timber across commercial builds. This guide explains why — and helps you decide which is right for your specific project.
The Case Against Timber Trusses in Ghana
Updated: Q1 2026 | Source: Iridak Roofing Systems build guide (iridakroof.com/build-iridak-steel-trusses/, Westcoast Roofing Ghana (February 2026)
Termites
Ghana’s tropical climate supports several destructive termite species, particularly in the southern forest belt and coastal zones. As confirmed on Iridak Roofing Systems' build guide (iridakroof.com/build-iridak-steel-trusses/, verified March 2026), termite attack on timber frames is typically invisible until damage is severe — galleries are formed inside the wood member and the external surface may appear intact while the interior is hollow. By the time visible symptoms appear — sagging ceilings, roof movement, visible galleries on exposed timber surfaces — structural damage is usually already extensive and remediation requires replacing not just the trusses but plasterboard, electrical components, and finishing work disturbed during access. Steel trusses contain no organic material. Termites cannot eat steel.
Warping, Shrinkage, and Moisture Response
As documented on Iridak Roofing Systems' steel trusses product page (iridakroof.com/build-iridak-steel-trusses/, verified March 2026), timber does not settle, warp, twist, or swell under temperature and humidity changes the way steel does not. Ghana’s climate cycles between the high humidity of the major rainy season (March to July), the minor rainy season (September to November), and the low-humidity harmattan period. Timber expands and contracts with each cycle, progressively loosening joints and distorting the roof plane. A warped truss system produces an uneven surface that accelerates water pooling and sheet deterioration. Steel maintains its geometry through all climate cycles.
Fire Resistance
Timber is combustible. An electrical fault in the roof cavity of a timber-framed building can ignite the truss system and propagate fire across the entire roof structure within minutes. As confirmed by the Steel Framing Alliance and Healthy Home Institute (cited on iridakroof.com/build-iridak-steel-trusses/, steel is non-combustible. Traditional materials when burnt release asphyxiating gases that are the main contributors to death in house fires. Steel frames eliminate the roof cavity as a fire propagation pathway.
Structural Inconsistency
Ghana’s market for construction timber has quality control problems. Much timber reaches site through informal supply chains without species verification or grading. A single knot or internal defect in a timber truss member can reduce its load capacity by 15 to 30 percent — a risk that is undetectable at the yard. CAD-engineered steel trusses from Iridak are fabricated to specification from certified material with consistent mechanical properties across every member.
The Case for CAD-Engineered Steel Trusses
Updated: Q1 2026 | Source: Iridak Roofing Systems steel trusses page (iridakroof.com/steel-trusses/, verified March 2026)
Termite-Proof by Material
As confirmed on Iridak Roofing Systems' steel trusses page (iridakroof.com/steel-trusses/, verified March 2026): there is no danger of the material being eaten by termites, white ants, borers, fungus, or other insects. The element of cost in using preservatives like solignum, creosote, and dursban is eliminated entirely. This is not a maintenance saving — it is a permanent structural advantage that requires no ongoing action.
Engineering Precision and Documented Structural Performance
Every Iridak steel truss system is designed using structural engineering CAD software. The design incorporates dead load (roofing sheet weight), live load (wind uplift and downward pressure to Ghana’s climate data), and any additional loads (solar panels, rooftop water tanks). The output is a structural calculation report that documents every load assumption and member specification. No timber truss installation in Ghana provides a structural calculation report. The Iridak report travels with the project and can be submitted to architects, structural engineers, or building inspectors as proof of the structural standard.
Superior Strength-to-Weight Ratio
As stated on Iridak Roofing Systems’ steel trusses page (verified March 2026), the safe working tensile stress of mild steel is approximately 20 times that of structural timber, making steel trusses very rigid and able to resist both compressive and tensile stresses effectively. Steel sections are lighter per linear metre than timber of equivalent structural capacity — reducing dead load on the building’s walls and foundation.
No Span Restrictions
As confirmed on Iridak Roofing Systems' steel trusses product page (iridakroof.com/steel-trusses/, verified March 2026), Iridak steel trusses can be fabricated in any desired pattern to suit the architectural requirement and have no span restrictions. For churches, warehouses, schools, auditoria, and commercial facilities where large column-free spans are required, steel is the only practical specification.
Full Comparison Table
Updated: Q1 2026 | Source: Iridak Roofing Systems, Westcoast Roofing Ghana, TroySteelRoofing.com Ghana FAQ (2025)
| Factor | Steel Trusses (Iridak AZ150) | Timber Trusses |
|---|---|---|
| Termite resistance | 100% — steel cannot be eaten | Vulnerable — requires chemical treatment |
| Warping / moisture response | None — dimensionally stable | Yes — expands/contracts with humidity cycles |
| Fire resistance | Non-combustible | Combustible — fire accelerant |
| Structural report | Included with every Iridak order | Not provided by site carpenters |
| Span capability | No limit — any span, CAD-designed | Limited — requires intermediate columns at large spans |
| Q1 2026 cost (3-bed house) | GHS 18,000 to 35,000 | GHS 10,000 to 18,000 |
| Installation speed | 2 to 3 days (prefabricated) | 5 to 10 days (cut on site) |
| Lifespan (Ghana climate) | 40 to 50+ years in roof cavity | 10 to 25 years (varies with termite exposure) |
| 20-year total cost | Lower — no treatment, no replacement | Higher — treatment + likely partial replacement |
Frequently Asked Questions: Steel vs Timber Trusses Ghana
Are steel trusses more expensive than timber in Ghana?
Upfront, yes — by 15 to 25 percent. Steel trusses from Iridak cost GHS 18,000 to GHS 35,000 for a three-bedroom house; timber may quote GHS 10,000 to GHS 18,000. Over 20 years in Ghana’s climate, however, steel eliminates termite treatment costs, warping repair costs, and the risk of full replacement — making the lifecycle cost of steel lower in most Ghana builds.
Do steel trusses rust in Ghana?
Iridak steel trusses are fabricated from AZ150-coated light gauge steel. Installed in a roof cavity, protected from direct rain and out of a coastal salt-air environment, AZ150-coated steel trusses will not rust under standard inland Ghana climate conditions. The coating provides durable corrosion protection equivalent to 40-plus years of service life in roof cavity environments.
Does Iridak provide a structural report with steel trusses?
Yes. Every Iridak steel truss order includes a CAD design and full structural load calculation report at no additional charge. This documents the load assumptions, member specifications, and connection design — suitable for submission to architects, structural engineers, or building inspectors. No timber truss installer in Ghana provides this documentation.
Market Pulse — Updated March 2026
Ghana Steel vs Timber Trusses: Latest Data
- February 2026: Westcoast Roofing Ghana published analysis confirming G550 and AZ150 steel trusses as Ghana construction industry’s preferred structural specification, displacing timber across commercial builds.
- Q1 2026: Steel truss cost for a three-bedroom house: GHS 18,000 to GHS 35,000 (Iridak / TroySteelRoofing Ghana FAQ, 2025). Timber truss equivalent: GHS 10,000 to GHS 18,000.
- December 2025: Ghana Statistical Service confirmed construction sector value-add growth of 9% in the first nine months of 2025 — rising construction volumes driving demand for quality truss systems.
- 2025 National Budget: Ghana’s housing deficit confirmed at 1.8 million units. Annual new unit requirement: 70,000 to 133,000 (World Bank / CAHF 2024) — creating sustained demand for structural roofing systems.
Reviewed quarterly. Sources: Iridak Roofing Systems, Westcoast Roofing Ghana, Ghana Statistical Service, Ministry of Works Housing and Water Resources.
Related Guides
- Light Steel Frame Roofing Ghana: What It Is and Why Builders Are Choosing It
- How Iridak Engineers Your Roof Trusses: The CAD Process
- Steel Truss Cost for a 3-Bedroom House Ghana (2026)
- Iridak Steel Trusses: Product Page
- Iridak Free Roofing Estimate Calculator
About the Author
Stephen Aidoo
Software Engineer & Digital Marketing Specialist — Iridak Roofing Systems Ghana ltd
Full-stack developer and AI-driven digital marketing strategist with expertise in WordPress, React Native, Python, and cloud infrastructure. Stephen builds scalable platforms, SEO automation systems, and AI-enhanced solutions for businesses across Ghana and beyond.
Last reviewed: March 2026
