Steeldor thermal was developed to comply with door efficiency targets stipulated by the government in Part L of the updated Building Regulations. The leaf has an insulated, internal Rockwool core enabling it to achieve a U-value as low as 1.5 W/m2K, compliant with the guidance of 1.6 for new dwellings and 1.8 for new commercial buildings in England.
The UK government has committed to reducing carbon emissions and meeting its target of net-zero emissions by 2050. In line with this, several changes have been made to the building regulations to improve the energy efficiency of buildings. One such change is to Part L of the building regulations, which sets minimum standards for the U-values required for a steel door.
Easy fit doors
10-15 day lead time*
Steel door experts
Single - up to 2.96m
Double - up to 2.96m
Single - up to 1.4m
Double - up to 2.7m
44mm deep leaf skin
EN1026:2000 to class 4 – 600Pa (113kmh) test pressure
EN1027:2000 to 150Pa for outward opening and 100Pa for inward
EN12211:2000 to 1200Pa (Class A3) 98 mph
Single - As low as 1.6 W/m2K
Double - As low as 1.5 W/m2K
BS 6375: Part 1: 2009 (test to EN1026:2000, EN1027:2000, EN12211:2000) to 1200 exposure rating
Up to 39dB rating.
Manufactured from lightweight, high tensile 1.5 mm thick ‘Rustec’ steel. Adjust 2-Fit side expander system that offers up to 12mm expansion to the structural opening.
44mm door leaf thickness, fitted with a flush lipped astragal for added security. Comprising of 2 x 1.2mm ‘Rustec’ steel sheets, the leaf is internally bonded with a dutch fold stitch welded system providing greater stability and protection against de-lamination. Rockwool insulated core.
BS 7352 Grade 13 stainless steel, twin bearing template drilled butt hinges with integral high-security dog bolts are fitted as standard with CE marking. Other hardware on request.
Supplied inclusive of a powder-coated finish in a standard colour. Full range of RAL and BS colours available.
Options and upgrades
Available as PAS 24: 2016.
Single Door Installation
This video contains detailed, step-by-step instructions for the safe installation of a Strongdor Steeldor single door-set. Please pay particular attention to the safety instructions.
Double Door Installation
This video contains detailed, step-by-step instructions for the safe installation of a Strongdor Steeldor double door-set. Please pay particular attention to the safety instructions.
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