How to Choose the Right Flammable Storage Building: Fire Ratings, Custom Options, and Chemical Safety

When it comes to storing flammable or hazardous materials, choosing the right building is not just a matter of convenience—it's a critical safety decision. ENPAC’s hazmat storage buildings are built to provide protection, compliance, and long-term reliability. But how do you determine the correct fire rating for your needs? And what options can you add to enhance safety and functionality?

This guide will walk you through:

1. How to determine the correct fire rating: Non-Combustible, 2-Hour fire-rated, or 4-Hour fire-rated
2. The customizable features available for your hazmat storage building
3. Common flammable chemicals stored in these units—and why proper storage matters

What Fire-Rated Building Do I Need?

Selecting the fire-rating will depend on:

• Proximity to the nearest occupied structure or property line.
• Volume and type of flammable or hazardous materials stored.
• Local codes and authority having jurisdiction (AHJ).

1. Non-Combustible – This is the lowest fire rating available for hazardous material storage buildings. These units are constructed from non-combustible materials, but are not designed to withstand prolonged fire exposure like 2- or 4-hour rated buildings.
   • Location – Must be placed at least 30 feet from the nearest occupied structure or property line.
   • Application – Ideal for remote locations or large sites where space allows for safe separation.
   • Compliance – Fully code-compliant when installed with proper setbacks and safeguards.

Explore: Non-Combustible Storage Buildings

2. 2-Hour Fire-Rated – Designed to withstand fire exposure for two hours.
   • Location – At least 10 feet from occupied structures.
   • Application – Suitable for most general-purpose hazmat and flammable storage needs.

Explore: 2-Hour Fire-Rated Storage Buildings

3. 4-Hour Fire-Rated – Provides four hours of fire resistance.
   • Location – Less than 10 feet from occupied structures.
   • Application – Used in urban or space-restricted facilities where closer placement is unavoidable.

Explore: 4-Hour Fire-Rated Storage Buildings

How Can I Customize My Hazmat Storage Building?

ENPAC offers a wide range of add-ons and features to tailor each building to your operational and regulatory needs:

• Loading Ramp – Facilitates safe loading/unloading of drums and totes.
• Shelving Systems – Organize and maximize interior storage space.
• Interior/Explosion-Proof Lighting – Improves safety and visibility during access.
• Heating and Air Conditioning – Essential for temperature-sensitive chemicals.
• Mechanical Ventilation – Helps maintain air quality and control flammable vapor accumulation.
• Dry Chemical Fire Suppression System – Provides rapid response to fires without damaging sensitive contents.
• Explosion Relief Panels – Protect personnel and assets by relieving pressure buildup.
• Door Type – Roll-up doors or multiple doors.
• Alarm System – Notifies personnel immediately of unauthorized entry, fire, or critical system failure—essential for protecting high-risk materials and meeting security requirements in industrial and regulatory environments.

What Am I Storing? Common Flammable Chemicals

Understanding the materials you’re storing is critical to selecting the right building. Common flammables include:

• Acetone – Highly flammable solvent used in cleaning and manufacturing.
• Ethanol/Isopropyl Alcohol – Frequently used in labs, cleaning, and sanitizer production.
• Paints and Thinners – Contain VOCs with low flash points, requiring ventilation.
• Gasoline and Diesel Fuel – Require bunded containment and flame-resistant storage.
• Resins and Adhesives – Emit flammable vapors and may need temperature control.

If you’re unsure of what your chemicals require, consult the Safety Data Sheet (SDS) or contact ENPAC for guidance.

ENPAC: Engineered Safety, Built to Code

At ENPAC, our team understands that safety, compliance, and usability go hand-in-hand. Whether you need a basic non-combustible building in a remote facility or a fully outfitted 4-hour fire-rated unit for close-quarters storage, we’re here to help you design the right solution!

We offer turnkey hazmat buildings that meet or exceed all relevant fire codes, with expert guidance available throughout your selection and installation process.

Explore the Full Product Line: Hazmat Storage Buildings

Still Need Help Choosing the Right Building for Your Application?

Contact us! Let our experts guide you through code requirements, layout planning, and custom options to ensure your flammable storage is safe, compliant, and efficient.

Contact ENPAC at info@enpac.com for any questions or a quote today!