Difference between F27KD Solid and Laminated Merbau Beams
1. What is Merbau structural timber?
Merbau is a dense, durable hardwood commonly used for structural and heavy-duty timber applications. It is valued for its strength, durability and attractive natural appearance.
2. What does F27 mean?
F27 is a structural strength grade for solid hardwood timber. It indicates that the timber has been graded to meet defined structural performance requirements.
3. What does KD mean?
KD means kiln-dried. The timber has been dried in a controlled kiln process to reduce moisture content, improve dimensional stability and make it more suitable for structural and construction applications.
4. What is GL17S?
GL17S refers to a structural laminated/glulam timber grade, where GL17 identifies the characteristic bending strength class and S denotes the relevant structural laminated timber classification.
5. What is GL17C?
A cambered merbau GL17C beam is an engineered, glue-laminated hardwood beam with a slight upward curve designed to flatten out and stay straight under heavy loads. What the Terms Mean
- Cambered: Built with a slight upward curve (often a 600-meter radius). When weight or a long-span load is applied, the beam deflects (sags) slightly downward, making it level and straight over time instead of sagging below horizontal.
6. What is the difference between Solid F27, GL17S and GL17C?
The main difference is the way the timber is manufactured and graded:
- Solid F27 KD – one-piece solid hardwood timber, kiln dried and structurally graded.
- GL17S – structural laminated timber manufactured by bonding individual timber laminations together.
- GL17C – structural combination-grade laminated timber using specified timber grades within the laminated member. The appropriate option depends on the required structural application, member size, span and engineering requirements.
7. Is Merbau F27 stronger than GL17 timber?
F27 and GL17 are different structural grading systems, so you shouldn't compare the grades as if they were identical ratings. The appropriate grade depends on the design requirements and the applicable engineering calculations.
8. Can these Merbau beams be used outdoors?
Merbau is naturally durable, but a particular structural member's suitability for outdoor use depends on exposure, moisture conditions, detailing, treatment requirements, and applicable building requirements.
9. Can Merbau structural beams be used for decks?
Yes, Merbau is commonly used in outdoor timber construction. However, whether a particular beam suits a deck's structural needs depends on its dimensions, span, loads, support arrangement, and engineering requirements.
10. Can I use these beams without an engineer?
Select structural timber based on the specific project's requirements. For load-bearing applications, spans, connections and support conditions may require design by a suitably qualified structural engineer.
F27KD vs. Laminated Merbau Beams
F27KD: Solid sawn timber, kiln-dried (KD), highly durable, but long solid lengths may contain natural knots or checking that affect appearance and capacity.
Laminated Merbau: Engineered by gluing stress-graded laminates together (often finger-jointed); straighter, more dimensionally stable, and available in larger profile sizes than solid timber
GL17S vs. GL17C Beams
GL17S (Straight): Standard straight glue-laminated structural member designed for uniform high-load and general applications.
GL17C (Cambered): Engineered with a slight upward curve (camber) to counteract natural downward deflection over long spans and settle flat under heavy loads.