Posi joists combine solid timber chords with open web design to create a lightweight, high performance joist system. Created by MiTek, they offer the strength of an engineered timber product with added advantage of clear access for services such as plumbing, electrics, and ventilation – no drilling, no alterations required.
The open web allows Posi-Joists to achieve longer clear spans than traditional solid timber, giving greater freedom for internal layouts and reducing the need for load -bearing walls. A wide stable fixing surface ensures fast, accurate floor installation while helping to control shrinkage and minimise movement over time.
Light to handle and quick to install, Posi Joists deliver superior stiffness and reliability, making them ideal for residential and commercial construction. They can also be engineered with enhanced thermal or acoustic properties, offering a versatile solution for floors, roofs, and wall applications.
Value engineering ensures Posi-Joists are designed to achieve the most efficient structural solution for each project. By optimising spans, load paths and material use, we deliver a system that meets performance requirements without unnecessary cost.
Through careful design, Posi-Joists can reduce the need for additional supports, simplify service integration, and improve overall build efficiency. This not only lowers material and labour costs but also helps streamline installation and minimise delays on site.
The result is a smarter, more economical floor system- engineered to perform, build to deliver, and tailored to the specific needs of your project.
It is particularly important for Posi-joist because it ensure the system is designed to deliver maximum performance at the most efficient cost – without over or under – specifying 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 the timber we use comes from responsibly managed forests and controlled sources. Programme for the Endorsement of Forest Certification (PEFC) provides independent assurance that timber is sustainably sourced, traceable, and managed to recognised international standards.
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.
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-practise and compliance requirements
