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FirstStep™ Sill
The residential door FirstStep™ Sill is a high-quality composite exterior door threshold product for the general market, delivering ideal performance for entry-level applications and beyond. Meeting the minimum residential building code requirements for water performance of PG15, the FirstStep™ Sill was developed to deliver the perfect balance of quality, utility and value.
Technical data
- The FirstStep™ Sill features exposed screws for easy adjustment and minimized damage to door sweeps
- No screw caps to lose
- Natural woodgrain look to the Adjustable Rail and Nosing
- .055 Aluminum Deck available in Mill or Bronze Anodize
- Industry standard 5 degree dado spec with 1 3/8″ high rail
- This exterior door threshold is available widths 3-1/2”, 4-9/16”, 5-5/8” and 7-5/8”
- Will accept our full line of 5 degree extenders (3/4″ – 4 3/8″)
Benefits
- The FirstStep™ Sill offers a Full Sill Program with Singles, Continuous Sidelite (CSL), French, and Patio configurations
- Quanex’s proven Screw/Clip technology equals reliability
- A competitively priced product for builder-grade and retail applications
- Rail assemblies can be removed and replaced without tools
- Pre-marked measurements help trim sills for installation
Performance
- The FirstStep™ Sill meets the minimum building code requirements for water performance of PG15
- Tile-back option allows sill to sit flush with tile flooring with available integrated gasket
- Can be configured to ADA accessibility requirements
Want to learn more?
Door Threshold Product Literature
This page was last updated on June 29, 2025. Downloaded document versions may differ. Please check the individual documents for most current version.