Thermohouse Posi-Joists
What Are Posi-Joists?
Lightweight. Strong. Designed for modern construction.
Posi-Joists are advanced engineered floor and roof joists developed by MiTek that combine the strength of timber chords with precision-engineered steel webs. This innovative open-web design creates a floor system that is stronger, faster to install, lighter to handle, and far more adaptable than traditional solid joists or I-joists.
At ThermoHouse, our Posi-Joists are manufactured to exact project specifications using MiTek’s proven design software and quality-assured fabrication systems. This ensures accuracy, consistent performance, and compliance with building regulations.
Whether you are constructing a one-off home, extension, or multi-unit development, Posi-Joists provide an efficient, reliable solution for long-span floor and roof structures.
Key Advantages of Posi-Joists
Designed to save time, money, and hassle on every build
Posi-Joists deliver significant benefits across all stages of a project.
Longer Spans
Achieve wide open layouts with fewer internal supports or load-bearing walls.
Built-In Service Zones
The open-web design allows plumbing, electrical and ventilation services to pass easily through the joists — eliminating the requirement and additional costs associated with the suspended/dropped ceilings.
Faster Installation
Lightweight components and pre-engineered precision mean quicker installation times and improved on-site safety.
Dimensional Stability
Factory-engineered joists minimise shrinkage, warping or twisting for perfectly flat floors and reduced cracking to finishes.
Reduced Site Waste
Delivered cut-to-length and ready to install, minimising offcuts and site clean-up.
How Thermohouse Supplies Your Posi-Joists
Fully designed, manufactured and delivered to your site
At ThermoHouse, we provide a complete Posi-Joist supply package:
✔ Project-specific structural design
✔ Full compliance engineering calculations
✔ Full layouts and erection drawings
✔ Precision factory manufacture using MiTek systems
✔ Clearly labelled joists and installation guidance
✔ Timely delivery directly to site
We work closely with homeowners, builders, architects and engineers to ensure smooth project coordination. Our experienced technical team is available throughout design and installation to provide expert support.
What are the construction benefits of Posi-Joists with Thermohouse?
- Speed of Installation – Manufactured to Measure
- Accommodates Services within Joist Height
- Unlike traditional Timber Floor Joists; splits, shakes, wrapping and natural deformities are not a factor of Engineered Posi-Joists
- Greater Span capability means less support wall requirement
- Suspended Ceilings no longer required
- Eco friendly material
Applications for Posi-Joists
Versatile across all residential and commercial projects
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New-build residential houses
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Renovations and extensions
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Timber-frame construction
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Commercial buildings
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Apartments and multi-unit developments
They integrate seamlessly with all construction methods, making them an ideal cost-efficient solution.
Why Choose Thermohouse for Posi-Joists?
Experience, precision and one reliable supplier
When you choose Thermohouse Posi-Joists you benefit from:
✅ Over 20 years of industry expertise
✅ Fully certified MiTek design and production systems
✅ Friendly, experienced technical support
✅ Fast turnaround times
✅ Competitive pricing
✅ Nationwide delivery
Whether you’re sourcing joists as a standalone product or as part of a full Thermohouse envelope solution, you receive the same commitment to engineering precision, responsiveness and top-tier customer service.
Thermohouse Low energy Building System
Posi-Joist design and quotation
📞 Contact Thermohouse today for your Posi-Joist design and quotation
📧 Send your drawings to info@thermohouse.ie to receive a full design proposal.
Let us help you build faster, better and smarter with Posi-Joists.