A Safe, Simple OSHA-Compliant Parapet Clamp Guardrail System

Working on rooftops, retaining walls, or other elevated surfaces with parapet walls? The Hilmerson® Parapet Clamp Guardrail System offers a non-penetrating, construction-grade™ solution that makes rooftop fall protection fast, secure, and OSHA-compliant.

At the heart of this system is our Parapet Wall Clamp, a dual-post adjustable clamp that mounts directly to parapet walls without the need for drilling, anchoring, or damaging the structure. Like all Hilmerson Safety® solutions, it’s built for the field—simple, safe, and durable.

Parapet Clamp Guardrail System

Why Choose a Parapet Clamp Guardrail System?

  • Fast and easy setup – Engineered for efficient rooftop installs

  • Dual post design – Adjusts from 6” to 18” to fit a wide range of parapet walls

  • Non-penetrating clamp – Avoids damage to building exteriors

  • Hot-dipped galvanized steel – For long-lasting, construction-grade™ durability

  • OSHA compliant – Meets safety regulations for temporary or permanent use

  • Made in America – Built with pride and built to last

  • 15+ year lifespan – A long-term safety investment

This system is fully compatible with the Hilmerson Safety Rail System™, with or without toeboards, and integrates seamlessly with other mounting options such as wall plates and base plates.

Parapet Clamp Guardrail System Hilmerson

What Is the Parapet Wall Clamp?

The Parapet Wall Clamp (HLM-GRPC2PG) is one of five anchoring options available for the Hilmerson Safety Rail System™, giving teams the flexibility to safely install guardrails on a variety of edge conditions. This clamp allows safety professionals to:

  • Securely attach rails to parapet walls without penetrating surfaces
  • Maintain full OSHA compliance on rooftops or elevated walkways
  • Transition from one rail attachment method to another with ease

The Parapet Wall Clamp is built with simplicity and jobsite efficiency in mind—delivering real savings in setup time, labor, and long-term maintenance.

FAQ: When Can a Parapet Be Used as a Guardrail?

Great question—and one that’s often misunderstood in the field.

According to OSHA standards (29 CFR 1926.502), a parapet may be used as a guardrail only if it meets the required criteria:

  • Height: The parapet must be at least 42 inches high (±3 inches) from the walking or working surface.
  • Strength: It must be capable of withstanding 200 pounds of force applied in any outward or downward direction.
  • Continuity: The parapet should offer continuous edge protection without significant gaps or openings.

If a parapet wall does not meet these requirements, it must be supplemented with a compliant guardrail system—such as the Hilmerson Parapet Clamp Guardrail System—to ensure adequate fall protection.

This is why our system is so valuable: even on parapets under 42″, you can now install OSHA-compliant guardrails without compromising the structure.

Five Versatile Safety Rail Attachment Options

HLM-GRBPXG Patented Penetrating Anchored Base Plate designed for concrete requiring a SINGLE anchor
HLM-SSGG Multi-Use Patented Stair / Slab Grabber
HLM-GRBPHXG Non-Penetrating Weighted Base Plate
HLM-GRWMG Guardrail Wall Mount Plate
HLM-GRPC2PG Parapet Wall Clamp

Learn More

Ready to simplify your rooftop or parapet edge safety?

Call us at (952) 239-0125 or email us here.

Parapet Clamp Guardrail System Hilmerson Safety®

About Hilmerson Safety

Hilmerson Safety® is a full-service safety product design and manufacturing company serving the construction industry. Since 2001 Hilmerson Safety® has been working with construction industry leaders and contractors to develop safe, lean, construction-grade™ products and solutions that add to the company’s bottom line.

For more information email us or call (952) 239-0125