Schüco ASS 70 Replacement Bifold Doors – Upgrade Options Explained

Intro

The Schüco ASS 70 bifold door system was widely used in older aluminium installations across the UK. While durable, it has now been superseded by newer, higher-performance systems such as the Schüco AS FD 75 and AS FD 90.HI.

If your existing ASS 70 doors are starting to feel dated, draughty, or difficult to operate, upgrading to a modern Schüco system can significantly improve thermal performance, security, and overall usability.

What is the Schüco ASS 70 system?

The Schüco ASS 70 is an older aluminium sliding and folding system designed for large openings. At the time of release, it was considered high performance, but building standards and thermal expectations have moved on significantly.

Typical limitations include:

  • Thicker frame profiles
  • Lower thermal insulation
  • Older sealing technology
  • Reduced energy efficiency compared to modern systems

Why replace ASS 70 bifold doors?

Replacing ASS 70 systems is common in UK refurbishments and upgrades.

Key reasons include:

  • ❄️ Poor thermal performance by modern standards
  • 🔒 Older locking and security hardware
  • 🌬️ Air leakage and draught issues
  • ⚙️ Wear in rollers and folding mechanisms
  • 🏡 Desire for slimmer modern aesthetics

Best replacement options for ASS 70

1. Schüco AS FD 75 (most common upgrade)

The AS FD 75 is the direct modern replacement for ASS 70 in most residential applications.

Benefits:

  • Slimmer sightlines
  • Better insulation
  • Smooth folding operation
  • Improved sealing system
  • Strong residential performance

2. Schüco AS FD 90.HI (high-performance upgrade)

The AS FD 90.HI is used where thermal performance is critical.

Best for:

  • New builds
  • Passive house-style projects
  • High-spec architectural homes

Benefits:

  • Extremely low U-values
  • Advanced insulation design
  • Premium glazing capability

ASS 70 vs AS FD 75 vs AS FD 90.HI

ASS 70

Can ASS 70 doors be repaired instead of replaced?

In some cases, yes — but only if:

  • rollers are worn
  • seals need replacing
  • alignment is off

However, if the system is:

  • more than 15–20 years old
  • thermally inefficient
  • heavily worn

👉 replacement is usually more cost-effective long term.

What you gain by upgrading

Upgrading from ASS 70 typically results in:

  • Lower heating bills
  • Improved comfort year-round
  • Better security performance
  • Larger glass-to-frame ratio
  • Smoother daily operation

Installation across the UK

We supply and install Schüco replacement systems across:

  • London
  • Birmingham
  • Swindon
  • Bristol
  • Home Counties
  • Wiltshire and surrounding areas

Conclusion

The Schüco ASS 70 system has served many homes well, but modern expectations around energy efficiency and design have moved on.

Upgrading to AS FD 75 or AS FD 90.HI ensures your home benefits from modern performance, improved aesthetics, and long-term durability.

FAQs

What is Schüco ASS 70?

A legacy aluminium bifold/sliding system widely used in older UK installations before modern AS FD systems.

Can ASS 70 bifold doors be replaced?

Yes, most systems can be replaced with Schüco AS FD 75 or AS FD 90.HI depending on performance needs.

What is the best replacement for ASS 70?

The AS FD 75 is the most common direct replacement for residential properties.

Is it worth upgrading ASS 70 doors?

Yes, due to improvements in insulation, security, and smooth operation.

Do you install replacement Schüco systems?

Yes, we supply and install across the UK.