Posi-Joists combine solid timber chords with an open-web design to create a lightweight, high-performance system. Developed by MiTek, they provide the strength of an engineered timber product while allowing clear access for plumbing, electrical wiring and ventilation—without drilling or alterations.
Their open-web construction enables longer clear spans than traditional solid timber, providing greater flexibility in internal layouts and reducing the need for load-bearing walls. A wide, stable fixing surface supports fast, accurate installation while helping to control shrinkage and minimise movement over time.
Easy to handle and quick to install, Posi-Joists offer excellent stiffness and reliability for residential and commercial construction. They can also be engineered to enhance thermal and acoustic performance, making them a versatile solution for floors, roofs and walls.
Value engineering ensures that Posi-Joists provide the most effective structural solution for each project. By optimising spans, load paths and material use, we create a system that meets performance requirements without unnecessary expense.
Careful design can reduce the need for additional supports, simplify service integration and improve buildability. This lowers material and labour costs while streamlining installation and minimising delays on site.
The result is a smarter, more economical floor system—engineered to perform, built to deliver and tailored to the specific requirements of your project.
It is particularly important for Posi-Joists, as it ensures the system delivers maximum performance at the most efficient cost—without over- or underspecifying the structure.
Armstrong Timber Engineering is an NSAI-certified manufacturer of timber-frame systems.
This certification confirms that our products and processes meet recognised standards for quality, performance and compliance.
We are PEFC-certified, ensuring that the timber we use comes from responsibly managed forests and controlled sources. The Programme for the Endorsement of Forest Certification (PEFC) provides independent assurance that our timber is sustainably sourced and traceable, and that the forests from which it originates are managed in accordance with recognised international standards.
As TRA members, we follow industry-approved standards for truss design, manufacturing and quality assurance. Membership provides independent oversight and technical guidance, giving our clients confidence that every truss meets recognised best-practice standards and compliance requirements.
Armstrong Timber Engineering is an active member of the ITFMA, the representative body for timber-frame manufacturers in Ireland.
Membership reflects our commitment to industry standards, quality and best practice.
