Non-Loadbearing Infill System

Pre-Assembled Frames

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Non-Loadbearing Infill System

Following the outstanding success of our Thruwall® system – EOS has taken factory prefabrication and preassembly to another level. Our custom-manufactured Pre-Assembled Frames (PAF) are an evolution of our Thruwall® system which is delivered to site as a unitised non-loadbearing infill system.

Pre-Assembled Frames are pre-cut, prefabricated, and preassembled offsite in controlled factory conditions. Our non-loadbearing infill systems encapsulate EOS light steel framing and external Siniat Weather Defence boarding, so they are ready for glass mineral wool insulation and Siniat internal wall linings to be fitted on site. 

Installation from inside the structure reduces working at height, mast climber requirements, and scaffolding costs. The cost and time benefits of the system can deliver programme savings of up to 30%. The PAF systems offers 60-minute fire resistance and provide a 30-year product and performance Etex warranty.

Non-Loadbearing Infill System

PAF Benefits

  • Meets Building Regulation requirements
  • Designed for steel or concrete mainframes
  • Delivered to site as assembled panels
  • Fully tested, performance assured system
  • Installation from inside the structure
  • Can deliver programme savings of up to 30%
  • 60 minutes fire resistance 
  • 30-year warranty
  • Rapid installation process
  • Predictable outcomes enhancing occupant safety
  • In-house technical support


Our testing regimes ensure that our Pre-Assembled Frames give specifiers complete peace of mind. For instance, we test our systems for fire, acoustic, weathering, airtightness, and mechanical performance.

All our components and products are tested together as a complete system to ensure compatibility. Testing allows us to award the technical performance of our Pre-Assembled Frames range with a 30-year Etex warranty. Our systems must meet our specification and validation process, in which components may not be substituted. 

Read more about our Certified Systems Approach here

Non-Loadbearing Infill System

PAF Specification Guide

Our Pre-Assembled Frames deliver vast cost and programme savings and ultimately achieve a faster return on investment for you.

For more information on EOS Pre-Assembled Frames, download the PAF brochure here:

Download here >

If you wish to speak to a member of the technical team:

Call: 01325 303030 Email: