Bitumen For Roofing Felt For Beginners
Last updated: 2026-10-13
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Bitumen For Roofing Felt For Beginners
Roofing felt is manufactured by saturating and coating a fiberglass or organic mat with oxidized bitumen, typically at a coating weight of 400–1,200 g/m² depending on the grade. For beginners, the industry-standard base material is 60/70 penetration-grade bitumen (or 10/20 oxidized grade for higher softening points), priced at approximately $420–$580 per metric ton FOB in 2025, with a single 20-foot container holding 24–28 metric tons. A typical roofing felt production line consumes 1.5–2.2 tons of bitumen per 1,000 m² of finished roll, making bitumen the single largest cost input at 45–60% of total production cost.
What Is Bitumen For Roofing Felt?
Bitumen for roofing felt is a dark, viscous petroleum derivative used to impregnate and coat carrier materials (fiberglass mat, polyester mat, or organic felt) to create waterproof roofing membranes. In roofing felt production, two main grades dominate:
| Grade | Penetration (25°C, 0.1mm) | Softening Point (°C) | Typical Use | Price (USD/MT, FOB) |
|---|---|---|---|---|
| 60/70 Penetration | 60–70 | 46–52 | Saturated felt base | $420–$480 |
| 10/20 Oxidized | 10–20 | 95–110 | Cap sheet coating | $520–$580 |
| 85/100 Penetration | 85–100 | 42–48 | Low-grade felt | $400–$450 |
| 30/40 Oxidized | 30–40 | 80–95 | Premium membranes | $550–$620 |
| SBS-Modified | varies | 110–125 | App membrane | $780–$950 |
- Penetration grade (60/70): Softer, cheaper, used for the inner saturation layer
- Oxidized grade (10/20): Harder, weather-resistant, used for the top coating
- Blown/oxidized bitumen: Air-blown at 230–280°C for 4–10 hours to raise softening point
The oxidation process increases viscosity and temperature resistance — critical because roofing felt must not soften under rooftop temperatures that can reach 70–85°C in summer.
How Bitumen Is Applied In Roofing Felt Production
The manufacturing process has three stages that beginners must understand:
Stage 1 — Saturation
The carrier mat (fiberglass or organic) passes through a bitumen bath at 160–190°C for 15–45 seconds. The mat absorbs 150–350 g/m² of bitumen.
Stage 2 — Coating
A second, oxidized bitumen layer is applied on both sides at 180–210°C, adding 250–850 g/m².
Stage 3 — Surfacing
Mineral granules, sand, or talc are pressed onto the top surface at 1,000–1,500 g/m² for UV protection.
| Production Stage | Bitumen Temp | Contact Time | Bitumen Added (g/m²) |
|---|---|---|---|
| Saturation | 160–190°C | 15–45 sec | 150–350 |
| Top Coating | 180–210°C | 5–15 sec | 250–550 |
| Bottom Coating | 180–210°C | 5–12 sec | 150–300 |
| Total per m² | — | — | 400–1,200 |
A mid-size roofing felt plant running 10,000 m²/day consumes roughly 12–18 tons of bitumen per day, or 300–500 tons per month.
Bitumen Grades: Which One For Which Roofing Felt?
Beginners often confuse penetration grade with oxidized grade. The table below maps each grade to its roofing felt application:
| Roofing Felt Type | Bitumen Grade | Standard | Lifespan |
|---|---|---|---|
| Type 15 organic felt | 85/100 pen | ASTM D226 | 5–8 years |
| Type 30 organic felt | 60/70 pen + 10/20 ox | ASTM D226 | 10–15 years |
| Fiberglass felt | 60/70 pen | ASTM D2178 | 10–20 years |
| SBS modified cap | SBS-modified | ASTM D6164 | 20–30 years |
| APP modified cap | APP-modified | ASTM D6222 | 20–25 years |
Key rule for beginners: If the felt is a base/saturated layer, use penetration grade. If it is a cap sheet or exposed membrane, use oxidized or modified bitumen.
Beginner Price & Sourcing Guide
Cost breakdown for a 1,000 m² batch of standard fiberglass roofing felt:
| Cost Component | Quantity | Unit Price | Total (USD) |
|---|---|---|---|
| 60/70 Bitumen | 1.8 MT | $450/MT | $810 |
| Fiberglass mat | 1,000 m² | $0.35/m² | $350 |
| Mineral granules | 1.2 MT | $180/MT | $216 |
| Labor & energy | — | — | $400 |
| Total | — | — | $1,776 |
| Cost per m² | — | — | $1.78 |
Sourcing tips for beginners:
- Order in 20-foot FCL (24–28 MT) containers to get the best FOB rate
- Lead time from Middle East/Asia to Europe: 18–30 days; to US West Coast: 25–40 days
- Minimum order quantity (MOQ): 50–100 MT from most exporters
- Payment terms: 30% T/T deposit + 70% against B/L copy is standard
- Request SGS or Intertek inspection before shipment — costs $400–$800 per container
FAQ: Bitumen For Roofing Felt For Beginners
Q1: What bitumen grade is best for roofing felt?
For standard saturated roofing felt, 60/70 penetration-grade bitumen is the industry standard because it balances cost ($420–$480/MT) and performance. For cap sheets and exposed membranes, use 10/20 oxidized bitumen with a softening point of 95–110°C.
Q2: How much bitumen is needed per ton of roofing felt?
A typical roofing felt roll contains 55–65% bitumen by weight, meaning 1 ton of finished felt requires 550–650 kg of bitumen. At current prices, that is roughly $250–$310 of bitumen per ton of finished product.
Q3: What is the difference between oxidized and penetration bitumen?
Oxidized bitumen is air-blown at 230–280°C to raise its softening point above 90°C, making it harder and more heat-resistant. Penetration bitumen is softer, cheaper, and used mainly for saturation layers rather than exposed surfaces.
Q4: How many tons of bitumen fit in a 20-foot container?
A standard 20-foot FCL holds 24–28 metric tons of bitumen, typically packed in 150 kg or 180 kg drums or in 1 MT jumbo bags. Flexitanks can carry up to 24 MT but are only economical for penetration grades.
Q5: What is the shelf life and storage requirement for roofing bitumen?
Bitumen has an indefinite shelf life if kept dry and away from direct sunlight. Store drums at ambient temperature below 40°C — no special heating is required until the melting stage, when it must reach 160–190°C for application.
Calculate Your Roofing Felt Bitumen Cost In Seconds
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