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Underfloor Heating Commissioning Certificate

An Underfloor Heating Commissioning Certificate records the pressure testing, flow balancing, and commissioning of an underfloor heating (UFH) system. It covers manifold setup, loop identification, flow rates, pressure test results, and the gradual warm-up protocol required before floor coverings are installed.

BS EN 1264 (water-based underfloor heating), Building Regulations Part LValid: One-off (issued at commissioning)

What it covers

  • Manifold location and loop layout
  • Pressure test results (typically 6 bar for 24 hours)
  • Flow rates per loop
  • Gradual warm-up protocol record
  • Control zone commissioning
  • Heat source integration

Who needs a UFH Commissioning?

Homeowners
Building contractors
Flooring installers (need proof of warm-up)
Building control

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Frequently asked questions about UFH Commissioning

Why is pressure testing important for UFH?
Pressure testing at 6 bar for 24 hours (or 2x working pressure) verifies that all joints are leak-free before the screed is poured. A leak under screed is extremely expensive to repair, so testing before covering is essential.
What is the warm-up protocol?
After screed has cured (typically 21-28 days), UFH must be gradually warmed: start at 25°C and increase by 5°C per day until design temperature is reached. This prevents thermal shock to the screed. The protocol must be recorded on the certificate.

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