Fire Rating Guide for Natural Wallcoverings

Your architect specified natural grasscloth for a hotel lobby — then the fire inspector asks for ASTM E84 documentation. Or your EU client needs EN 13501 Euroclass B certification and you're not sure if your wallcovering qualifies. Fire compliance is the #1 technical barrier to specifying natural wallcoverings in commercial projects. As a manufacturer who tests to all four major global standards, here's everything you need to know.

Why Fire Rating Matters

Fire rating is not optional for commercial projects. Building inspectors can reject installed wallcoverings that lack proper fire test documentation, requiring costly removal. Insurance underwriters may deny claims if untested materials contributed to fire spread.

As a manufacturer, we see two common mistakes:

1. Assuming "natural = flammable" — treated natural wallcoverings routinely pass ASTM E84 Class A. The fire-retardant treatment is invisible and does not affect appearance or texture.
2. Testing the wallcovering alone — fire codes evaluate the installed assembly. A wallcovering that passes on gypsum board with wheat paste may fail on plywood with vinyl adhesive. Always match your test report to your actual installation conditions.

ASTM E84: The US Standard

The Steiner Tunnel Test — a 25-foot furnace that measures how quickly flame spreads across a material's surface. This is the test your US building inspector will ask about.

Class	Flame Spread Index (FSI)	Smoke Developed Index (SDI)	Typical Requirement
Class A	0–25	0–450	Exit corridors, stairwells, lobbies, assembly areas
Class B	26–75	0–450	Guest rooms, offices, classrooms
Class C	76–200	0–450	Residential (some jurisdictions)

How Natural Wallcoverings Perform

Material	Untreated	Fire-Retardant Treated
Grasscloth (Seagrass)	Class B (FSI 35–55)	Class A (FSI 15–22)
Sisal	Class B (FSI 40–60)	Class A (FSI 18–24)
Cork	Class B (FSI 30–50)	Class A (FSI 12–20)
Wood Veneer	Class C (FSI 80–120)	Class B (FSI 35–55)
Metallic / Gold Foil	Class A (FSI 10–20)	Class A (FSI 5–15)
Mica	Class A (FSI 8–18)	Class A (FSI 5–12)

Key takeaway: Grasscloth and sisal need fire-retardant treatment for Class A; metallic and mica naturally achieve Class A without treatment. We offer FR treatment as a standard production option at no additional cost for orders over 300 m².

NFPA 286: The Room Corner Test

A full-scale test that simulates actual fire conditions in a room. A gas burner in the corner ignites the wallcovering, and the test measures heat release, flame spread and whether flashover (full-room ignition) occurs.

Key Facts

• Pass/Fail — unlike ASTM E84's grading system, NFPA 286 is binary: pass or fail.
• Passing = Class A equivalent — if a wallcovering passes NFPA 286, building code allows its use wherever Class A (per ASTM E84) is required.
• When it's required — some AHJs (Authorities Having Jurisdiction) require NFPA 286 for textile wallcoverings, expanded vinyl, or any material that ASTM E84 may not accurately test.
• More expensive — the test costs $5,000–$10,000 vs $1,500–$3,000 for ASTM E84. We maintain current NFPA 286 pass certificates for our most popular grasscloth and sisal products.

EN 13501: The European Standard

The Euroclass system is used across the EU, UK, and many countries that adopt European building codes.

Euroclass	Fire Behavior	Smoke	Droplets	Roughly Equivalent To
A1, A2	Non-combustible	—	—	No US wallcovering equivalent
B	Very limited contribution to fire	s1 (low)	d0 (none)	ASTM E84 Class A
C	Limited contribution	s1–s2	d0–d1	ASTM E84 Class B
D	Acceptable contribution	s2	d1–d2	ASTM E84 Class C
E, F	Significant / untested	—	—	Not acceptable for most applications

Our fire-retardant treated grasscloth and sisal achieve Euroclass B-s1,d0 or C-s1,d0. We provide test certificates from accredited European laboratories (TÜV, CSTB, BRE).

GB 8624: The Chinese Standard

China's national fire classification standard, relevant if you're sourcing from Chinese manufacturers or installing in Chinese projects.

• A (不燃) — Non-combustible (stone, metal)
• B1 (难燃) — Difficulty combustible. This is the standard our products meet. Roughly equivalent to ASTM E84 Class A/B.
• B2 (可燃) — Ordinary combustible. Untreated natural fibers without FR treatment.
• B3 (易燃) — Easily combustible. Not acceptable for any interior application.

All our wallcoverings are tested to GB 8624 B1 as standard. The test certificate is included with every shipment.

Which Standard Do You Need?

Project Location	Required Standard	Typical Requirement
United States	ASTM E84 (or NFPA 286)	Class A for corridors/exits; Class B for rooms
Canada	CAN/ULC-S102	Same classes as ASTM E84
EU / UK	EN 13501-1	Euroclass B or C depending on building type
China	GB 8624	B1 for most commercial interiors
Australia	AS 5637.1 / ISO 9239	Group 1 or 2
Middle East (UAE, KSA)	ASTM E84 or BS 476	Class A / Class 0
Residential (any country)	Often none required	Check local code — some jurisdictions exempt single-family residential

How to Request Fire Test Documentation

When specifying wallcoverings, always request these documents from your supplier:

1. Full test report — not just a "certificate." The report should show the testing lab name, test date, sample description, mounting method and numerical results (FSI, SDI or Euroclass).
2. Mounting configuration — confirm the test was performed on the same substrate you plan to use (typically Type X gypsum board with specific adhesive).
3. Lab accreditation — the testing laboratory should be ISO 17025 accredited. In the US, look for NVLAP accreditation.
4. Currency — test reports should be recent (within 5 years) and reference the current edition of the test standard.

We maintain current ASTM E84, EN 13501, and GB 8624 test reports for all product lines, backed by 15+ years of production experience shipping fire-rated wallcoverings to 40+ countries. Request our fire test documentation — we typically send it within 24 hours.

Frequently Asked Questions

Is natural grasscloth fire-safe for commercial buildings?

Yes, with fire-retardant treatment. Treated grasscloth and sisal achieve ASTM E84 Class A and EN 13501 Euroclass B, meeting the requirements for most commercial applications including hotel corridors and office lobbies. The treatment is applied during manufacturing and does not affect the material's appearance or texture.

Does fire-retardant treatment change how grasscloth looks or feels?

No. Modern FR treatments are clear, odorless liquid applications that penetrate the fiber without altering color, texture or hand feel. There is zero visible difference between treated and untreated grasscloth.

Can I add fire retardant to wallcovering after installation?

We strongly advise against field-applied fire retardants. They can stain natural fibers, void manufacturer warranties, and may not achieve consistent penetration. Fire retardant should be applied during manufacturing under controlled conditions. If you need FR performance, order FR-treated product from the start.

What if my building code requires NFPA 286?

We maintain current NFPA 286 pass certificates for our most-specified grasscloth and sisal products (natural seagrass weave on non-woven backing, installed on Type X gypsum with clay-based adhesive). For other product configurations, contact us — we can commission a test with 6–8 week lead time.

Related Guides

Fire test data in this guide reflects current test reports as of Q2 2026. Fire code requirements vary by jurisdiction — always verify with your local AHJ (Authority Having Jurisdiction). This guide is for informational purposes and does not constitute professional fire safety advice.