Alcot Plastics manufactures a full line of high-quality backer rods designed to deliver consistent performance in all types of joint and sealant applications. Available in both Soft Cell and Hard Cell varieties, Alcot Backer Rod provides reliable joint backing for commercial, industrial, and residential construction projects.

The Soft Cell Backer Rod is a highly flexible, open-cell foam ideal for irregular or varying joint sizes. It easily compresses into tight spaces and allows air to escape during sealant application—helping prevent air bubbles and ensuring a smooth, professional finish.

The Hard Cell Backer Rod is a closed-cell polyethylene foam designed for uniform joints and precise depth control. It offers excellent moisture resistance, prevents three-sided adhesion, and maintains its shape under pressure—making it the go-to choice for high-performance sealing applications.

Both types of Alcot Backer Rod are compatible with most cold-applied sealants including silicone, polyurethane, and latex. They improve joint efficiency, control sealant usage, and extend the lifespan of sealant systems across glazing, concrete, and façade installations.

Key Features:

• Available in Soft Cell (open-cell) and Hard Cell (closed-cell) options

• Ensures proper sealant depth and joint configuration

• Prevents three-sided adhesion for longer-lasting seals

• Compatible with most sealant chemistries

• Lightweight, flexible, and easy to install

• Non-absorbent and resistant to most construction chemicals

Benefits:

• Enhances overall sealant adhesion and flexibility

• Reduces material waste by controlling sealant depth

• Adapts to both irregular and uniform joint profiles

• Provides superior moisture resistance and durability

• Supports a cleaner, professional joint appearance

Typical Uses:

• Expansion and control joints in concrete and masonry

• Glazing and curtain wall systems

• Window and door perimeters

• Precast panels, parking decks, and pavement joints