Thermally Rated Steel Door

Steel Doors Designed For Compliance

Custom Built Thermally Rated Doors

Built from lightweight yet high-tensile 1.5 mm Rustec steel, each door comes with Adjust-2-Fit expandable sides (up to 12 mm each) for fast, precise installation. With a 44 mm leaf thickness and a durable powder-coated finish available in over 150 RAL colours, it’s designed to perform and impress. Like all doors in the range, it can be customised with vision panels, louvres, hardware options, and PAS 24 security upgrades.

Compliant With Building Regulations

Our Thermally Rated Steel Door is engineered to exceed UK Building Regulations Part L efficiency targets. With a Rockwool insulated core, it achieves U-values as low as 1.5 W/m²K—outperforming the 1.6 benchmark for homes and 1.8 for commercial buildings.

Designed to cut energy use and carbon emissions, it supports the UK’s net-zero 2050 goals while delivering strength, sustainability, and proven performance.

Sound and Weather Proofing

  • Expandable sides as standard
  • Over 150 colours as standard
  • Keeps in the heat
  • Range of hardware options

Product Features

Height

Single – up to 2.96m
Double – up to 2.96m
Leaf & A Half – up to 2.96m

Width

Single – up to 1.4m
Double – up to 2.7m
Leaf & A Half – up to 2.69m

Leaf thickness

44mm deep leaf skin

Air permeability

EN1026:2000 to class 4 – 600Pa (113kmh) test pressure.

Water tightness

Water tightness EN1027:2000 to 150Pa for outward opening and 100Pa for inward

Resistance to wind load

EN12211:2000 to 1200Pa (Class A3) 98 mph

Thermal Transmittance U-Value

Single – As low as 1.6 W/m2K.
Double – As low as 1.5 W/m2K.

Acoustic Rating

Up to 39dB rating.

Weather Tightness

BS 6375: Part 1: 2009 (test to EN1026:2000, EN1027:2000, EN12211:2000) to 1200 exposure rating.

Further information

Frame

  • Made from lightweight, high-tensile 1.5 mm Rustec steel, each door features our Adjust-2-Fit side expander system, allowing up to 12 mm adjustment for a perfect fit to the structural opening

Leaf

  • 44 mm door leaf thickness with flush-lipped astragal for added security

  • 2 × 1.2 mm Rustec steel sheets for strength and durability

  • Dutch fold stitch-welded system providing stability and protection against de-lamination

  • Rockwool insulated core for added strength, durability, and thermal performance

 

Door Ironmongery

  • BS 7352 Grade 13 stainless steel butt hinges with twin bearings and template drilled

  • Integral high-security dog bolts fitted as standard

  • CE marked for compliance

  • Additional hardware options available on request

Finish

Each door is supplied with a durable powder-coated finish in a standard colour.

Upgrade to any colour in the full RAL palette to match your project’s branding or environment.

Customisation Options and Upgrades

  • Boost safety and meet industry standards with our new Earth Bonding upgrade

  • Available as PAS 24: 2016

Personnel Steel Door Configurations

Our personnel steel door configurations are built for versatility, offering tailored solutions that combine strength, security, and reliable performance for any project.

Emergency Exit Door Configurations

Our exit steel door configurations are built for versatility, offering tailored solutions that combine strength, security, and reliable performance for any project.

Over 150 colours available

Any questions about this product?

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