Vietnam has become one of Asia's most competitive sources for fiber cement boards, with modern autoclave lines producing to European and American standards. But "fiber cement board" covers a wide quality range, and the cheapest sheet on an FOB quote is rarely the cheapest sheet on your site. Here is what an international contractor should actually check.
1. Autoclaved vs air-cured
The single most important production question. Autoclaved boards are cured in a pressurised steam chamber, which completes the cement reaction and locks the board's dimensions — low moisture movement (look for ≤ 0.05%), stable in humid and coastal climates. Air-cured boards are cheaper to make but continue to move as they absorb and release moisture, which shows up later as cracked joints and paint failure on facades.
If the datasheet doesn't say "autoclaved", ask. If the answer is vague, walk away.
2. Specify by standard and grade, not thickness
A "9mm board" tells you almost nothing. Specify against the recognised standards:
- ISO 8336 — the international standard for fiber cement flat sheets; it classifies boards by category (A for external, B for internal) and strength class.
- ASTM C1186 — the US standard; Grade II is the usual minimum for external cladding, Grade III/IV for higher structural demands.
- EN 13501-1 — fire classification; quality fiber cement achieves A1 non-combustible, which many facade codes now require.
A serious manufacturer will state category, grade and fire class on the datasheet and back them with third-party test reports — not just a factory certificate.
3. Match thickness to application
As a rule of thumb: 4.5–6 mm for ceilings and internal linings, 6–9 mm for partitions and external cladding on battens, 12 mm for high-impact walls, and 16–20 mm (often tongue-and-groove) for flooring and mezzanine decks with point loads of 4.5 kN or more. Buying thicker than the application needs wastes freight budget — fiber cement is heavy, and sea freight is priced by container, not by sheet.
4. Understand your real landed cost
An FOB Haiphong price is typically only 60–75% of your landed cost. Build the full picture before comparing suppliers:
- FOB price (ex-works + inland Vietnam + port handling)
- Sea freight to your port — fiber cement loads heavy, so a 20ft container often maxes out on weight (~24–26 tonnes) before volume
- Import duty and taxes in your market
- Port clearance and inland delivery to site
Two quotes that differ by 10% on FOB can land within 2% of each other — or swap order entirely — once freight and duty are applied.
5. Plan the timeline honestly
Typical production is 2–4 weeks after deposit and spec confirmation, plus sea freight (roughly 1 week within Southeast Asia, 3 weeks to Australia, 5 weeks to Europe), plus customs and inland delivery. Facade boards are usually needed 8–12 weeks after foundation completion — which means the order often needs to be placed before or during groundworks. Run your dates through a landing planner before you commit a programme.
The short version
Demand autoclaved production, third-party test reports against ISO 8336 / ASTM C1186 / EN 13501-1, compare landed cost rather than FOB, and order earlier than feels natural. Or send us your BOM and let our desk do all of the above for you — consolidated proposal within 48 hours.