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Apex™ Door System Adjustable Threshold – 5 5/8' Inswing Sill, Black Cap & Composite Bottom, Mill Finish, 36' Uncut – Energy-Efficient, Weatherproof, and Durable

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$71.50

$ 31 .99 $31.99

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  • Adjustable Height for a Perfect Seal – Customizable fit ensures a tight, weatherproof seal to improve energy efficiency and insulation.
  • Heavy-Duty Composite Construction – Built with reinforced composite materials and a durable mill finish, outperforming traditional wood and aluminum thresholds.
  • Seals Out Drafts & Moisture – Blocks cold air, dust, and water, keeping interiors comfortable and energy-efficient.
  • Simple DIY Installation – Designed for easy trimming and customization, with pre-drilled holes for a quick setup.
  • Ideal for Homes & Businesses – A versatile threshold solution suited for residential and commercial entryways.


Product Description

APEX Door System by CTI Flex Series Sills

APEX Door System Inswing Sill
Composite Cap ✓ ✓ ✓ ✓ ✓
Composite Bottom ✓ ✓ ✓ ✓ ✓
Aluminum Deck ✓ ✓ ✓ ✓ ✓
Adjustable ✓ ✓ ✓ ✓ ✓
Threshold

Apex Door System by CTI Exterior Inswing Adjustable Threshold

Flex Series

The Apex Door System by CTI Flex Series Exterior Inswing Adjustable Threshold offers easy installation, adjustable components, and a weathertight design for exterior entryways. With a 36-inch uncut length, it can be trimmed for a custom fit. The sturdy aluminum body and composite cap provide long-lasting performance, while the composite bottom maintains a sealed barrier.

  • Easy Installation
  • Adjustable
  • Weathertight
  • Durable Construction
  • Composite Bottom