Thermal Doors

Defender Thermaguard

Defender Thermaguard is independently accredited to provide a value as low as 1.4W/m2K for a single doorset.

Enquire Double Door Single Door Vision Panel Fire Rated Side and Over Panel Thermally Rated

The Defender Thermaguard doorset has been developed to meet the increased demands for energy-efficient buildings as part of a greener future.

The Defender Thermaguard doorset uses a range of design innovations that reduce the U-value of a typical single doorset to as low as 1.4 W/m²K, meeting the latest requirements of the Building Regulations Part L in England, Scotland and Wales. Defender Thermaguard is accredited by a UKAS approved company as defined by the requirements of BS EN 10077-2:2017.

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Door Leaf

• Anti-jemmy flange on the leading edge (square edged option available)

• 1.5mm galvanised steel (upgrades: 2.0mm galvanised or 1.5mm stainless steel, 304/316)

• Weld-free construction prevents premature failure

• Mineral wool core with internal strengtheners (chipboard upgrade for added strength)

• 60mm depth minimum door leaf to achieve a U-value of 1.5 W/m²K

• 70mm depth minimum door leaf to achieve a U-value of 1.4 W/m²K.

Thresholds

• Standard DDA-compliant chamfered profile in 2mm stainless steel

• Options: raised/extended cills, inward-opening profiles with drainage, 4mm ramped design

• Integrated removable thresholds available.

Vision Panels

• Custom-sized vision panels to meet requirements

• Triple glazed options with privacy films, blinds, and obscure glass.

Frames

• 110mm depth minimum door frame to achieve a U-value of 1.5 W/m²K

• 120mm depth minimum door frame to achieve a U-value of 1.4 W/m²K

• Bolted corners for strength

• Threaded adjustors for easy installation (16+ fixings). Optional plain fixing plates

• 3mm steel hinge brackets.

Seals

Tubular silicone rubber seal bonded into frame for optimal weather, thermal, and acoustic performance.

Over Panels & Side Panels

• Removable overpanels/transoms: Ideal for periodic access (e.g. large machinery)

• Glazed panels: Triple glazed with weathertight wedge-gasket seals.

Key Information

Resources

Defender Thermaguard Datasheet pdf (384.8 KB)

Hardware & Finishes

Hardware

• Stainless steel ball bearing hinges (4+ per door, with security dogbolts)

• Upgrade options: concealed bearings, special finishes, fully concealed, heavy-duty continuous hinges

• Extensive hardware range: locks, latches, handles, panic hardware, closers, and stays. Custom hardware integration available.