Insulated Aluminium Sliding Doors
Thermal Break Aluminium Sliding Doors
Insulated thermal break sliding doors that stop cold bridging through the frame — for heated extensions, glass rooms and year-round living spaces.
Thermal breakinsulated profiles
Double-glazedinsulated glass
~30 mmlow threshold option
~8 weekstypical production
Overview
Warm frames, clear views
A thermal break is an insulating barrier built into the aluminium frame that stops heat escaping through the metal. Combined with insulated double glazing, thermal break sliding doors keep heated rooms warm in winter and cool in summer.
They are the right choice for kitchen extensions, living rooms and fully enclosed glass rooms where comfort and energy bills matter.
Choose a low or raised threshold and any RAL colour.
Key Features
Why choose thermal break sliding doors?
01
Energy efficient
Insulated frames reduce heat loss.
02
Quiet
High sound insulation with insulated glass.
03
Smooth sliding
Easy to open, quiet to close.
04
Durable
Rust-resistant aluminium, low maintenance.
05
Weatherproof
Designed for all weather.
06
Modern design
Slim, minimal profiles.
Buying Guide
Do you need a thermal break door?
Choose by how the room is heated and used.
Heated living space
Yes — thermal break frames prevent cold bridging.
Open terrace or unheated room
Standard sliding patio doors are enough.
Very large panels
Consider lift and slide.
Level access
Choose the low threshold.
Technical Specification
Thermal break doors — specification
- Thermal break aluminium sliding profiles.
- Insulated double glazing (4 + 12 + 4 mm tempered, Comfort option).
- Low (~30 mm) or raised threshold.
- Secure locking.
- Any RAL colour.
- Typical production around 8 weeks.
Gallery
Thermal break door gallery
See it in motion
What is a thermal break?
An insulating strip within the aluminium profile that separates the inner and outer frame to stop heat transfer.
Pricing
Priced by size and glass. Request a free quote.
FAQ
Thermal break sliding doors — FAQ
What does thermal break mean?
An insulating barrier in the frame that stops heat passing through the aluminium.
Do I need thermal break doors?
For heated rooms, yes; for open terraces, standard profiles are fine.
Is a low threshold available?
Yes, approximately 30 mm.
How long is production?
Typically around 8 weeks.
Free, No-Obligation Quote
Get your thermal break sliding door quote
Tell us about your opening and we will send a thermal break door quote.
- Choose panels, threshold and glass.
- Add the opening width and height in millimetres.
- Leave your details — we reply with a quote.
How to measure
- Measure the structural opening width at the top, middle and bottom.
- Measure the height at both sides.
- Note the floor finish and any step.
- Photograph the opening from inside and outside.