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The APA Facade Systems design team have just completed a new thermally enhanced ST70 HI casement window system. Along with the centre seal from our original ST70 HI, the new system includes new polyamides and new foam cores resulting in a whole window Uw value as low as 0.170 Btu/ft ² hr °F

ST70 HI Window System - APA Facade Systems

ST70 HI 

Thermally Enhanced 2 3/4” Window System

This enhanced thermal performance makes the ST70 window a very cost-efficient solution for your eco-friendly project.
With a glazing variant of 1 1/8” – 1 5/8“, this high-performance window is suitable for all types of construction from Residential to Commercial, Educational to Healthcare.

ST70 HI Window System - APA Facade Systems
ST70 HI Window System - APA Facade Systems
ST70 HI Window System - APA Facade Systems

High Performance


The durability and performance characteristics of the ST70 window regarding acoustics and weather tightness have resulted in this system achieving and surpassing the AAMA 101 standards for windows and doors, meeting the CW PG50 grade. The ST70 HI is the perfect solution for multi-level condominium or student accommodation developments.

  • Includes multi-point locking for added security
  • Superb thermal performance
  • Eco-friendly polyamide core
  • Glazing thickness of 1 1/8” – 1 5/8
  • Identical sightlines throughout
  • Can be pre-assembled in-house saving installation time/cost
  • Available with single, dual color or anodized finish.
  • Polyester powder coating to ASTM 2604.
  • Matching rebate doors available
  • Evaluated and tested to AAMA 101 for windows and doors meeting the CW50 grade. 


The ST70 casement window is available in a variety of styles such as tilt and turn, casement (push out/in swing), awning, hopper or parallel sash. 

The versatility of the locking mechanism used in the ST70HI window allows the designers to incorporate extra-large sashes in the building.

ST70 HI High Performance Window System
ST70 tilt and turn high performance aluminum window system

Tilt & Turn

The ST70 Inward Opening Tilt & Turn Window System is a great solution to areas of a facade that require ease of access for cleaning or maintenance.

The windows durability and performance characteristics – acoustics and weather tightness, meet with the highest AAMA standards and are all independently tested by an ASTM approved and certified facility.

Our Window Systems

  • ST60
  • ST70
  • ST70 HI
  • ST70 Concealed Sash
  • ST80
  • ST90
  • Life-Enhancing Window

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APA Technical Library

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