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What Is an Open-Web Joist Floor?
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Understand how open-web floor joists work, why they make routing services easier and what must be considered during design and construction, all explained in plain English.
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What is an open-web joist floor? This guide explains how open-web (metal-web) joists combine timber top and bottom chords with diagonal metal webs to create a strong floor structure with built-in space for pipes, cables and ducts. It covers the main components, why open-web joists are used, risks from unauthorised cutting, and how service routes should be planned.
For the wider structural context, see Approved Document A on GOV.UK, or explore our other What Is? guides.
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