ClassicBond Pourable Sealer for Rubber Roofing Pipe Box Pocket

EPDM Rubber Roofing Sealant for Pipe Box Pockets & Penetrations

ClassicBond One Part Pourable Sealer is a single-component, moisture-curing elastomeric sealant designed to create a flexible, watertight seal around awkward roof penetrations.

It is primarily used with the ClassicBond Pipe Box Pocket system, where it is poured into the assembled pocket to form a durable, seamless waterproof barrier around pipes, ducts and irregular roof details.

What This Pourable Sealer Is Used For

ClassicBond Pourable Sealer is used to:

• Seal pipe box pockets on EPDM rubber roofing
• Waterproof technically challenging penetrations
• Form a flexible seal around irregular shapes
• Protect roof details where field flashing alone is not practical

Once poured, the sealant self-levels inside the pocket and cures to form a long-lasting waterproof seal.

• Why Pourable Sealer Is Essential

A pipe box pocket alone does not create the seal - the pourable sealer does.

Used correctly, it:

• Completely fills the pocket cavity
• Bonds to primed EPDM surfaces
• Remains flexible after curing
• Resists cracking from movement
• Forms a neat, professional finish

It simplifies one of the most difficult detailing areas on a flat roof.

Key Features & Benefits

• Ready to use - no mixing required
• Moisture curing, elastomeric polyether formulation
• Self-levelling for clean application
• Resealable pouch to reduce waste
• Waterproof within a short time after application
• Compatible with EPDM, TPO, metal and bituminous surfaces

How It’s Used (Overview)

1. Install and secure the pipe box pocket
2. Prime all internal surfaces in accordance with EPDM primer guidelines
3. Fill the assembled pocket completely with pourable sealer
4. Protect from moisture during curing

The sealant must be applied on a flat, level surface and is not intended for steep slope applications

Coverage

Each 2L pouch fills approximately 2 litres of pocket volume.

Storage & Limitations

• Store between 18°C and 29°C before use
• Do not apply to wet or damp surfaces
• Not intended for steep slope applications
• Do not use grout or alternative fillers

A Roofer’s Perspective

Pourable sealer is what turns a pipe box pocket from a plastic collar into a fully waterproof detail.

Used properly with primer, it fills the void completely and creates a flexible seal that moves with the roof. It’s one of the simplest ways to secure awkward penetrations without overcomplicating the detail.

Summary

ClassicBond One Part Pourable Sealer is the essential finishing component for pipe box pocket installations on EPDM rubber roofing. Quick to apply, self-levelling and moisture curing, it delivers a durable waterproof seal around complex roof penetrations.

If you’re installing a pipe box pocket, this is the product that completes the system correctly.