BS 5422 Resource Centre
The complete UK reference for pipe insulation thickness, compliance and specification under BS 5422:2009 (Amended 2014)
Used by M&E engineers, building services consultants, MCS installers and contractors throughout the UK
BS 5422:2009 — What It Covers
BS 5422:2009 sets minimum pipe insulation thicknesses for heating, hot water, chilled water, cold water and steam pipework in commercial and domestic buildings.
It is referenced by Part L of the Building Regulations and is essential for achieving compliance in new builds and refurbishments. Learn more about BS 5422
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Frequently Asked Questions
BS 5422 compliance means using pipe insulation that meets the minimum thickness requirements set out in BS 5422:2009 for your specific application and pipe size.
Our comprehensive thickness tables guide provides all the minimum insulation thicknesses required for heating, chilled water, cold water and steam systems.
Part L of the Building Regulations references BS 5422 as the standard for pipe insulation thickness in new builds and major refurbishments.
Yes, MCS guidance requires pipe insulation to meet or exceed BS 5422 minimum thicknesses for heat pump and renewable heating installations.
Chilled water pipe insulation thickness depends on pipe diameter and operating temperature. Our chilled water guide provides full BS 5422 tables.
Yes, heat pump pipework must meet BS 5422 minimum thicknesses. Our Heat Pump Hub provides specific guidance for air source and ground source systems.