Fire Safety Practices for Fabric Storage Buildings

Fire safety is a critical consideration for any storage building, and fabric buildings have specific characteristics that owners should understand. While PVC covers offer certain fire-resistance properties, good fire safety practices around and inside the building remain essential.

PVC Fire Behaviour

PVC — polyvinyl chloride — is inherently self-extinguishing, meaning it does not sustain combustion on its own. When a flame source is removed, PVC stops burning. This is a significant safety advantage over materials like polyethylene tarps, which melt and continue burning, or untreated fabric, which sustains flame readily.

However, self-extinguishing does not mean fireproof. A sustained external heat source — such as a vehicle fire or burning debris against the building — can damage or destroy the PVC cover. The 750 g/m² material offers better resistance than lighter covers simply because there is more material to consume, but no PVC cover should be considered fireproof.

Separation Distances

Alberta’s building codes and municipal bylaws specify minimum separation distances between buildings to prevent fire spread. These distances vary by building type, size, and use, but typical requirements include 5 to 10 metres between buildings depending on construction type and occupancy. Maintaining these distances is not just a regulatory requirement — it is practical fire prevention.

Pay particular attention to separation from fuel storage tanks, workshops where welding or grinding occurs, and hay storage buildings or stacks. Hay fires are a well-known agricultural hazard, and keeping fabric buildings at a safe distance from hay storage is prudent regardless of code requirements.

Interior Fire Risks

The most common fire risks inside storage buildings are not related to the building itself but to its contents and activities. Fuel-powered equipment parked inside the building can leak fuel or have electrical faults. Stored chemicals, paint, and solvents are combustion hazards. And agricultural products like hay can self-combust if stored at too high a moisture content.

Practical interior fire safety measures include never refuelling equipment inside the building, storing flammable liquids in approved containers in a separate location, checking hay moisture before storage (below 18 percent for square bales, below 16 percent for round bales), and keeping the building interior free of accumulated debris and waste.

Electrical Safety

If you add electrical service to your fabric building — for lighting, outlets, or equipment — use a licensed electrician and ensure the installation meets Alberta’s electrical code. Extension cords run across the floor, overloaded circuits, and non-rated temporary wiring are common fire starters in agricultural buildings. A proper electrical installation with ground fault protection and appropriately rated circuits eliminates these risks.

Fire Extinguishers and Detection

Keep at least one fire extinguisher rated for Class ABC fires at each building entrance. A 10-pound dry chemical extinguisher is the minimum recommended size. Check extinguishers annually to ensure they are charged and accessible.

For buildings storing high-value contents or housing activities that increase fire risk, consider adding smoke detection with an alarm that can be heard from your house or shop. Battery-operated smoke detectors designed for unheated spaces are available and provide early warning that can make the difference between a small incident and a total loss.

Emergency Planning

Think through what you would do if a fire occurred. Can fire trucks access the building? Is the nearest water source adequate? Are the building’s contents insured? A few minutes of planning and a conversation with your local fire department can help you develop a practical response plan before you need one.

Frequently Asked Questions

Can fabric buildings store hay effectively?

Fabric buildings are one of the most cost-effective ways to store hay. The PVC cover keeps rain and snow off your bales while allowing enough air circulation to prevent mould growth. Studies show that covered hay retains 95%+ of its nutritional value compared to outdoor-stored hay that can lose 25–35% to weathering. The ROI on covered storage often pays for the building within 2–3 seasons.

What size building do I need for hay storage?

Sizing depends on bale size and stacking method. For large round bales (5'×5'), you can fit approximately 3 bales per 100 square feet when stacked in rows. A 40'×60' building (2,400 sq ft) stores roughly 70–80 large round bales. For small square bales stacked high, you can store significantly more per square foot. Contact MAX for a sizing consultation based on your specific needs.

How do I prevent moisture in a fabric hay storage building?

Proper moisture management starts with site preparation: ensure your gravel pad has adequate drainage slope (2% minimum) away from the building. Stack bales on pallets or a gravel base — never directly on bare ground. Configure end walls for cross-ventilation to allow moisture to escape. In humid climates, leaving one end partially open provides excellent airflow without compromising weather protection.