Irwin 65105 Marking Chalk 5 Lb Exterior Orange

Product Description

The IRWIN 65105 is a 5-pound exterior marking chalk designed for use with chalk line reels on job sites where long-term line visibility matters. Formulated for outdoor conditions, this orange chalk maintains visible lines for weeks after application even when exposed to moisture, UV, and general weather. It is commonly used by framing carpenters, concrete contractors, roofers, and other trade professionals who need a reliable layout reference that holds up through multiple phases of work. The orange color provides high contrast against concrete slabs, lumber, roofing substrates, and other common work surfaces.

This chalk is suited for exterior layout tasks including foundation and footing layout, roof sheathing alignment, concrete flatwork scoring, and site grading reference lines. The 5-pound fill quantity makes it practical for refilling standard chalk line reels on larger projects where frequent refilling would slow productivity. It is sold individually and is appropriate for both commercial and residential construction applications where a semi-permanent exterior-grade chalk is required.

Key Features

• Exterior-grade formulation maintains line visibility for weeks after application
• Orange color delivers high contrast on concrete, wood, and roofing surfaces
• 5-pound fill weight suits extended use and large-project refills
• Compatible with standard chalk line reels used across trades

Compatibility

Designed as a standard refill chalk for use with chalk line reels in exterior construction and layout applications.

Installation Notes

Fill chalk line reels in a dry environment to avoid clumping during loading. On exterior surfaces, allow any standing moisture to dry before snapping lines to maximize adhesion and line sharpness. Store unused chalk in a sealed container away from humidity to prevent hardening. No specialized tools or trade licensing are required for use.

Technical Specifications

• Weight: 5.38 pounds
• Color: Orange
• Application Type: Exterior
• UPC: 024721651051

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 65105