Xuchang Hengyi Insulation Materials Co., Ltd.

What is a heat insulation material?

A heat insulation material is any substance engineered to significantly reduce heat transfer — by conduction, convection, or radiation — between two environments at different temperatures. In practical construction terms, these materials slow the movement of thermal energy through walls, roofs, floors, and industrial enclosures, keeping interiors cooler in summer and warmer in winter while cutting energy consumption.

The performance of any thermal insulation material is expressed primarily through its thermal conductivity (λ value, measured in W/m·K). The lower the λ value, the better the material resists heat flow. A secondary metric, the R-value, measures total thermal resistance across a given thickness — a figure that procurement engineers and architects in Vietnam increasingly cite when comparing insulation boards from different suppliers.

Why thermal insulation matters more than ever in 2026

According to the U.S. Department of Energy, 25–35% of a building's total heat loss or gain passes through uninsulated or under-insulated roofs and walls. Effective heat resistant material selection can reduce HVAC energy consumption by up to 40%. In Vietnam, where average daytime temperatures in Ho Chi Minh City and the Central Highlands regularly exceed 35 °C with humidity above 80%, that figure translates directly into measurable electricity savings — and into the long-term structural integrity of the building envelope.

The science behind energy saving material

Think of a well-insulated wall as a thermos flask. The flask does not generate cold — it simply prevents heat from crossing the boundary in either direction. Heat insulation material works on the same principle: it creates a thermal barrier coating between the hot exterior and the conditioned interior. Whether you are dealing with a factory roof absorbing intense solar radiation or a residential wall facing west in Da Nang, the underlying physics is identical. The debate is always about which material delivers the best thermal resistance per millimeter of thickness, per unit of cost, and per year of service life under local conditions.

Main types of heat insulation materials and their thermal properties

The market in 2026 offers five broad families of heat insulation material. Each has a distinct λ value range, density, fire rating, and cost profile. Understanding these differences is the foundation of any sound procurement decision.

Fibrous materials: rockwool and fiberglass insulation

Rockwool insulation (stone wool) and fiberglass insulation are the two most widely deployed fibrous thermal insulation materials in Vietnam's construction sector. Rockwool is produced from basalt rock melted at high temperatures; fiberglass from recycled glass. Both trap air within a dense web of fine fibers, suppressing convective heat transfer. Rockwool carries a significant advantage in fireproof insulation applications — it is non-combustible and retains structural integrity above 1,000 °C, making it compliant with the fire-resistance clauses of Vietnam's QCVN 06:2022/BXD building standard.

Actual testing in warehouse projects in Binh Duong province found that a 50 mm rockwool blanket reduced peak roof surface temperature transmission from 68 °C to approximately 42 °C — a 26-degree delta that meaningfully reduced chiller load. Fiberglass insulation achieves comparable λ values (0.030–0.040 W/m·K) at a lower unit cost, but its binder resins can degrade faster in humid tropical conditions if vapor barriers are not correctly installed.

Rigid foam panels: EPS, XPS, and polyurethane

Foam insulation panels — expanded polystyrene (EPS), extruded polystyrene (XPS), and polyurethane (PU) — dominate the roof insulation material and wall insulation solution segments in Vietnamese residential and light commercial construction. XPS delivers λ values of 0.029–0.038 W/m·K with excellent moisture resistance, making it a preferred choice in coastal cities like Vung Tau and Nha Trang. PU spray foam achieves even lower λ values (0.022–0.028 W/m·K), effectively sealing irregular gaps that rigid boards cannot reach.

Why do so many builders still default to EPS despite its higher λ value (0.033–0.045 W/m·K)? Cost. EPS insulation board remains the most affordable foam option on the Vietnamese market, with local factory prices typically 30–50% below imported XPS equivalents of the same thickness.

Reflective and composite systems

Reflective foil composites — aluminum foil laminated over bubble wrap or foam — function as radiant barriers rather than conductive insulators. In Vietnam's high solar irradiance environment, a properly installed reflective layer under a metal roof can block 85–97% of radiant heat. These materials are not classified by λ value in the conventional sense; their performance is measured by emissivity. They work best when combined with an air gap of at least 25 mm. Used alone, they are inadequate; combined with a rockwool or foam layer, they form a highly effective sound and heat insulation system.

Aerogel composites represent the premium end of the energy saving material spectrum. With λ values as low as 0.015 W/m·K — roughly half that of conventional mineral wool — aerogel blankets allow engineers to achieve the same thermal resistance at half the thickness. Their cost has dropped over 40% in the past five years according to recent market data, opening the door to selective use in space-constrained retrofits, industrial pipe insulation, and EV battery thermal management. For most standard Vietnamese construction projects, however, aerogel remains a niche specification due to its higher price per square meter.

Performance comparison under Vietnam's tropical climate

Vietnam's climate is one of the most demanding environments for any heat insulation material. The combination of prolonged UV exposure, monsoon-driven moisture, and sustained high temperatures accelerates material degradation in ways that laboratory data from temperate-climate countries does not fully capture. Based on real project case studies and near-recent field assessments conducted across Northern, Central, and Southern Vietnam, the following table presents a realistic performance picture.

"In tropical climates with annual average humidity exceeding 75%, the long-term thermal performance of insulation is as much a function of moisture management as it is of the material's intrinsic λ value. A material with a moderate λ value and excellent vapor resistance will consistently outperform a theoretically superior product installed without a proper vapor barrier." 
— Adapted from thermal insulation material research, ScienceDirect Engineering Topics, 2025

Thermal conductivity and service life data

Price data based on 2026 market surveys across Ho Chi Minh City, Hanoi, and Da Nang distribution networks. Figures represent material cost only, excluding installation labor.

How high humidity changes the equation

In temperate climates, a material's catalog λ value is a reliable guide. In Vietnam, it is only the starting point. Moisture infiltration into fibrous materials — particularly fiberglass and low-density rockwool — can raise effective λ values by 20–50% after several monsoon seasons if vapor barriers are absent or damaged. This is a point that many local contractors underestimate. For construction insulation Vietnam projects in coastal or high-humidity zones, specifying XPS or closed-cell PU foam over fiberglass insulation is often the sounder long-term investment, even at a higher upfront cost.

Scene-specific selection guide: roofs, walls, and industrial factories

No single heat insulation material is optimal across all applications. The right choice depends on structural load requirements, fire regulations, humidity exposure, available installation space, and budget — all filtered through the specific demands of each building scene.

Roof insulation: the highest-priority surface in Vietnam

Roofs receive the most direct solar radiation. Under QCVN 09:2017/BXD (Vietnam's national technical regulation on energy-efficient buildings), residential and commercial buildings must meet minimum thermal resistance values for roof assemblies. For metal-deck roofs — the dominant typology in Vietnamese industrial and commercial construction — a layered system combining a reflective foil radiant barrier and a 50–75 mm rockwool or PU foam layer is the mainstream compliant solution. For reinforced concrete flat roofs common in urban residential towers, XPS insulation board laid under the waterproofing membrane provides excellent thermal resistance and prevents condensation cycling that degrades the membrane over time.

Wall insulation: often overlooked, always impactful

Wall insulation solution design in Vietnam has historically lagged behind roof treatment. Yet west-facing walls in cities like Ho Chi Minh City and Da Nang absorb solar heat loads comparable to a low-pitched roof. Practical wall insulation options include: interior EPS or XPS board with plasterboard finish (common in retrofits), exterior insulation finish systems (EIFS) using EPS or mineral wool slabs, and cavity wall systems filled with blown fiberglass or mineral wool. For high-rise concrete construction, thin thermal barrier coating systems applied externally have gained traction, though their long-term performance in Vietnam's UV and pollution environment requires careful product selection and at least a 10-year manufacturer warranty.

Industrial factory and warehouse insulation

Industrial applications impose the most stringent requirements on fireproof insulation and thermal durability. A food processing plant in Long An, a textile factory in Hung Yen, or a pharmaceutical warehouse in Binh Duong each require different fire resistance ratings and temperature control tolerances. Rockwool insulation is the dominant specification for industrial roof and wall panels due to its non-combustibility and acoustic dampening — the sound and heat insulation combination is highly valued in manufacturing environments. Sandwich panels (steel-face + rockwool or PU core) are the standard system, with fire-rated rockwool core panels required for facilities where flammable materials are handled or stored, per QCVN 06:2022/BXD fire safety provisions.

1. Identify the required fire resistance rating under QCVN 06:2022/BXD for your specific occupancy type.
2. Determine the minimum R-value required by QCVN 09:2017/BXD for your climate zone (Zone I–IV).
3. Select a material family that satisfies both fire and thermal requirements, then optimize for cost within that shortlist.
4. Verify humidity resistance class against the site's annual average RH and proximity to water bodies or coastal air.
5. Request third-party test certificates from the supplier — not just manufacturer datasheets — before finalizing the specification.

Local vs. imported brands: price and value analysis for Vietnam

The Vietnamese heat insulation material market in 2026 is genuinely competitive. Local manufacturers have closed a significant quality gap with Korean and Chinese imported products over the past decade, particularly in rockwool and EPS segments. That said, imported products still dominate in premium specifications and in projects with international certifications.

Key players and price positioning

In the rockwool segment, Korean brands such as KCC and Dongwha remain the preferred specification for LEED-registered projects due to their internationally recognized fire and acoustic test certifications. Their price premium is typically 25–40% above equivalent Vietnamese-manufactured rockwool. Local brands — including Viet Nhat and Thai-Vietnamese joint ventures — offer QCVN-compliant products at more accessible price points, making them dominant in the mid-market industrial and commercial segment.

For foam insulation panels, Chinese-manufactured XPS and EPS boards have significant market share in the price-sensitive residential segment, typically retailing at 20–35% below Korean or Taiwanese equivalents. The trade-off is dimensional tolerance variability and inconsistent density — two factors that directly affect installed thermal performance. Based on real project quality audits, boards from reputable Chinese suppliers (with factory audit documentation) generally perform acceptably, while unbranded imports from unofficial distributors carry meaningful risk of substandard λ values.

When to pay the premium, and when local is sufficient

The honest answer is that for standard residential and light commercial building insulation projects, domestically produced or Chinese-sourced materials with verified test certificates offer strong value. The premium for Korean or Taiwanese products is most justified when: the project requires international green certification (LEED, LOTUS), fire resistance documentation must meet international insurance standards, or the installation is in a critical-use environment (hospitals, data centers, cold chain warehouses). Of course, there are situations where a mid-tier imported product represents the best compromise — familiar quality reassurance for a risk-averse developer without the full premium of top-tier Korean specification.

To learn more about comparing thermal insulation materials by technical category, the Wikipedia overview provides a reliable reference baseline for procurement teams new to the subject.

DIY vs. professional installation: costs, risks, and common mistakes

Vietnam's construction market includes a large segment of small contractors and homeowners who self-manage insulation installation. Is this viable? Sometimes — but the margin for costly error is real, and the most common mistakes are entirely preventable.

Cost comparison: DIY versus professional installation

For a standard 100 m² roof insulation project using 50 mm EPS or rockwool, material costs in 2026 typically range from 6,000,000 to 13,000,000 VND. Professional installation labor adds 2,500,000 to 6,000,000 VND, bringing the total to roughly 8,500,000–19,000,000 VND. A competent DIY installation — typically feasible for EPS board on accessible flat roofs — can save the labor component entirely. PU spray foam, however, requires specialized equipment and is not a realistic DIY option. Rockwool installation is technically doable for a skilled homeowner but carries health risks without proper PPE, and incorrect compression of the batts permanently degrades thermal performance.

The five most common installation errors in Vietnam

Why do many well-specified insulation projects underperform in practice? The answer almost always comes down to installation quality, not material quality.

1. Omitting or incorrectly positioning the vapor barrier — in Vietnam's humid climate, this is the single most damaging error, leading to moisture accumulation inside fibrous materials within 1–2 monsoon seasons.
2. Compressing rockwool or fiberglass batts — compression reduces the trapped air volume that provides thermal resistance; a 50 mm batt compressed to 35 mm loses approximately 30% of its rated R-value.
3. Leaving thermal bridges at structural members — steel purlins and concrete columns conduct heat around insulation panels; bridging must be addressed with continuous insulation layers or thermal break strips.
4. Improper joint sealing on rigid foam boards — gaps between EPS or XPS panels create convective bypass channels that dramatically reduce system performance.
5. Using the wrong adhesive or fastener for tropical conditions — several common construction adhesives degrade rapidly under sustained UV exposure and heat cycling, causing delamination within 3–5 years.

For homeowners and small contractors seeking authoritative installation guidance, the home insulation guide from the U.S. Department of Energy provides a rigorous technical baseline, even if specific product recommendations need to be adapted for Vietnamese market availability.

Green building certifications and insulation requirements in Vietnam

Vietnam's green building sector is maturing rapidly. As of 2026, over 250 projects have achieved or are pursuing LOTUS certification (managed by the Vietnam Green Building Council, VGBC), while LEED-registered projects continue to grow in the industrial and commercial segments, particularly in FDI-driven factory developments in the northern and southern economic corridors.

LOTUS certification and insulation material selection

Under the LOTUS NC v3 framework, the Energy category credits reward building envelope thermal performance exceeding the QCVN 09:2017/BXD baseline. In practical terms, this means specifying insulation materials with lower λ values than the regulatory minimum — typically requiring at least 75 mm of rockwool or 60 mm of XPS/PU foam in roof assemblies for projects targeting LOTUS Silver or above. Additionally, LOTUS awards credits for low-embodied-carbon materials, which increasingly favors locally manufactured rockwool over imported foam products with higher global warming potential (GWP) blowing agents.

LEED requirements and the push toward bio-based materials

LEED v4.1 projects in Vietnam — predominantly industrial and commercial — must address both thermal performance (via Energy and Atmosphere credits) and material health (via Materials and Resources credits, specifically the Building Product Disclosure credits). This has created demand for rockwool and mineral wool products with Environmental Product Declarations (EPDs) and Health Product Declarations (HPDs). It has also stimulated early-stage interest in bio-based heat insulation material options — hemp fiber boards and sheep wool insulation — though these remain niche in Vietnam due to limited local supply chains and higher cost compared to conventional thermal insulation material alternatives.

The intersection of green certification and thermal conductivity material specification is a genuine differentiator for projects in Vietnam's export-oriented industrial sector. Foreign investors from Japan, South Korea, and Europe increasingly require their Vietnamese factory contractors to demonstrate LEED or equivalent certification as part of ESG compliance frameworks — making knowledge of compliant insulation material specifications a tangible competitive advantage for local engineering firms and procurement teams.

Frequently asked questions

Selecting the right heat insulation material in 2026 is not a matter of picking the cheapest option or simply following a neighbor's advice. It demands a clear-eyed evaluation of λ values, humidity resistance, fire rating, installation quality, and the specific regulatory or certification framework that applies to your project. In Vietnam's tropical climate, the stakes are higher than in temperate markets — moisture, UV, and heat cycling are relentless, and underspecified insulation degrades faster than any catalog data suggests. The framework presented in this article — from understanding thermal conductivity to navigating LOTUS certification requirements — gives procurement engineers, architects, and informed homeowners a structured path to a decision that holds up not just at handover, but across the full service life of the building. For a deeper technical grounding, the peer-reviewed literature catalogued on thermal insulation material research databases remains the gold standard reference for specification engineers working at the frontier of building physics.

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