Danger Underground Jackhammering Sign – Vibrations and Noise Hazard Hearing Protection Required, 8x12 Rust-Resistant Aluminum Tunnel and Construction Safety Sign by CGAP Safety

Underground jackhammering is loud enough on the surface. Put it in a tunnel and the noise turns brutal fast.

The CGAP Safety “Danger – Underground Jackhammering – Vibrations & Noise Hazard – Hearing Protection Required” sign is designed for tunneling, mining, and heavy civil projects where jackhammers and breakers are used below grade. The bold red DANGER header and straightforward text warn crews and visitors that they are entering an area with significant noise and vibration hazards and that hearing protection is required.

This 8 x 12 inch sign is manufactured from rust-resistant aluminum to handle damp, dirty, and high-traffic underground environments. The high-contrast red, black, and white OSHA-style layout stands out on bulkheads, manway doors, and access points so the message can be seen quickly as people enter the work zone.

Use this sign as part of your overall hearing conservation and impact-tool safety program to reinforce PPE expectations and warn non-essential personnel away from active jackhammering areas.

Important: This product is a warning sign only and does not replace noise surveys, hearing conservation programs, or required training. Always follow applicable safety standards, site rules, and manufacturer instructions for jackhammers and other impact tools.

CGAP Safety is an American safety sign manufacturer dedicated to straightforward, durable signage that helps contractors and operators see the gap and close the gap in their safety programs.

• UNDERGROUND JACKHAMMERING WARNING SIGN – “Danger / Underground Jackhammering / Vibrations & Noise Hazard / Hearing Protection Required” clearly alerts crews and visitors that jackhammer operations are in progress in a confined underground space.
• CALLS OUT NOISE & VIBRATION HAZARD – Direct wording highlights both excessive noise and vibration, reminding workers to take hearing protection seriously around jackhammers, breakers, and other impact tools.
• 8x12 RUST-RESISTANT ALUMINUM – Rigid 8 x 12 inch sign manufactured from rust-resistant aluminum with high-contrast red, black, and white graphics for a professional look that outlasts paper, laminated sheets, and thin plastic in damp tunnels and job sites.
• HIGH-VISIBILITY OSHA-STYLE LAYOUT – Classic red “DANGER” header and bold block lettering make the message easy to read at a distance on bulkheads, access doors, manways, and underground work platforms.
• FOR TUNNELS, MINES & HEAVY CIVIL JOBS – Ideal for tunneling projects, underground utilities, mining headings, shafts, and heavy civil construction where jackhammering is performed in confined or echo-prone spaces.
• MADE BY AN AMERICAN SAFETY MANUFACTURER – Produced by CGAP Safety, an American safety sign manufacturer focused on clear, compliance-minded messaging and durable materials for real-world industrial and construction environments.