High performance in terms of air and water tightness, dust, insects, sound reduction requires sealing of the full sash perimeter. Any low threshold or threshold-less arrangement will compromise the performance aim but traditional living habits combined with ergonomics are today's overriding factors for fenestration.

Sapphire Systems is offering, wherever possible, Aluminum low threshold solutions or provide suggestions on how to prepare ground levels to hide the unwanted, high frame up stand associated with Fold & Slide Patio Doors and Tilt & Slide Patio Doors. Sapphire Systems has chosen purposely Aluminum thresholds with silver anodized finish to provide a hardwearing foundation for years of product durability.