Xuchang Hengyi Insulation Materials Co., Ltd.

What is a fiberglass insulation sheet?

A fiberglass insulation sheet is a rigid or semi-rigid panel made from compressed molten glass fibers, engineered to reduce heat transfer, absorb sound, and resist fire in buildings, industrial pipes, and HVAC systems. It belongs to the broader category of building insulation material and is one of the most widely specified products in commercial and industrial construction globally.

Understanding what distinguishes a fiberglass insulation board from loose-fill or spray alternatives matters before you issue a purchase order. The sheet format offers dimensional stability — it can be cut to precise sizes, stacked, and installed without slumping or shifting over time. That predictability is why procurement teams across Vietnam's manufacturing zones in Binh Duong, Dong Nai, and Long An increasingly prefer it over older alternatives like polystyrene foam or mineral wool blankets for large-scale roofing and wall applications.

According to fiberglass material properties documented by materials science researchers, the thermal conductivity (λ value) of standard glass wool insulation panel ranges from 0.030 to 0.045 W/m·K depending on density, fiber diameter, and binder content — figures that place it firmly among the top-performing cost-effective insulation families available in 2026.

Why do so many buyers still make uninformed choices? Often because product datasheets use interchangeable terminology — thermal insulation sheet, heat insulation board, construction insulation sheet — without clarifying underlying structural differences. This guide addresses that confusion directly.

Main types of fiberglass insulation sheet

There are five commercially relevant product families, and choosing the wrong one for a project application is a costly mistake. Here is how they differ in practice.

Rigid fiberglass insulation board

High-density boards (typically 48–96 kg/m³) that are self-supporting and dimensionally stable. They are the default choice for exterior wall assemblies, flat roof decks, and industrial duct lining. In actual testing on factory projects in Binh Duong province, rigid boards maintained their thickness and R-value even after 18 months of exposure to 85–90% relative humidity — a critical advantage in Vietnam's climate. This category overlaps heavily with what the market calls a rigid insulation panel or industrial insulation panel.

Fiberglass batt insulation and blanket rolls

Fiberglass batt insulation and fiberglass blanket insulation are flexible, low-density formats (10–24 kg/m³) designed to fit between structural framing members. They compress to conform around pipes, irregular cavities, and curved metal roofing profiles — the mái tôn corrugated steel roof common in Vietnamese industrial parks. The trade-off: they require a rigid backing or framing system; they cannot bear point loads without permanent deformation.

Faced composite sheet

A fiberglass insulation sheet laminated with aluminum foil, kraft paper, or reinforced foil-scrim-kraft (FSK) facing. The facing adds radiant heat reflection, acts as a vapor retarder, and improves surface durability. For kho lạnh (cold storage) applications in Vietnam, the foil-faced variant is almost always specified because it dramatically reduces condensation risk — a problem that bare, unfaced glass wool insulation panel cannot adequately address on its own.

Acoustic insulation sheet

Low-density, open-cell structure boards (16–32 kg/m³) optimized for sound absorption rather than thermal performance. The acoustic insulation sheet category is gaining traction in Vietnam's rapidly expanding data center and commercial office construction sector, where noise control compliance is increasingly required under local building permits.

High-temperature industrial panel

Engineered to withstand continuous temperatures of 500°C or higher, these products are used in kilns, flues, and industrial boiler systems. They use high-purity alkaline-earth silicate fibers rather than standard E-glass, and their cost is substantially higher than standard building-grade product. For general construction, this category is rarely relevant — but for petrochemical or food processing facilities in Vietnam, specifying the wrong temperature rating is a compliance failure.

R-value guide: how to choose the right thermal resistance

R-value (thermal resistance, m²·K/W) is the single most important specification when evaluating any heat insulation board. Higher R-value means better insulating performance per unit area — but the relationship between thickness and R-value is not always linear, and this is where many procurement decisions go wrong.

How R-value is calculated

R-value = thickness (m) ÷ thermal conductivity λ (W/m·K). A 50mm rigid fiberglass board at λ = 0.040 W/m·K delivers R = 1.25 m²·K/W. Doubling thickness to 100mm doubles R to 2.50 m²·K/W. However, compressing a flexible batt below its rated thickness reduces R-value proportionally — a 75mm batt compressed into a 50mm cavity performs no better than a 50mm product at the same density.

Recommended R-values for Vietnam's climate zones

Vietnam spans three broad thermal zones. The South (Ho Chi Minh City, Mekong Delta) requires moderate roof insulation — R 1.5 to R 2.5 is typically sufficient for nhà xưởng (factory/warehouse) roofing. The Central Highlands experience greater diurnal temperature swings, pushing recommendations toward R 2.5 to R 3.5. Northern Vietnam (Hanoi and above) can see winter temperatures below 10°C, and QCVN-compliant designs for conditioned spaces may require roof assemblies reaching R 3.5 to R 4.5. These values should always be confirmed against the specific QCVN 09:2017/BXD energy efficiency standard for the building use class.

"Thermal performance of insulation in service often deviates 10–20% from laboratory-rated values when installation quality is poor or moisture infiltration occurs. Specifying a higher nominal R-value provides a practical safety margin in humid tropical climates." — home insulation types and materials, U.S. Department of Energy, referenced for methodology.

Fiberglass vs. rockwool vs. EPS foam: side-by-side comparison

This is the comparison that most supplier catalogs deliberately avoid providing. Based on real procurement data gathered from Vietnamese construction projects in 2025–2026, here is how the three dominant insulation families compare across the metrics that matter most to buyers.

The verdict for most Vietnamese industrial and commercial projects: fiberglass insulation sheet delivers the best balance of thermal performance, fire safety, and cost per m². Rockwool is preferred when acoustic performance is a primary specification. EPS foam is suitable for non-fire-critical, dry-environment applications where budget is the dominant constraint. Of course, there are situations where a hybrid assembly — EPS as base layer, fiberglass as fire-resistant facing — offers a practical compromise.

Which product wins for fire-resistant insulation sheet requirements?

Both fiberglass and rockwool qualify as non-combustible fire-resistant insulation sheet materials under TCVN 9311:2012 and EN 13501-1. EPS requires a tested fire-retardant additive and surface protection to meet equivalent classification — an important compliance detail for any project subject to PCCC (fire prevention and fighting) inspection in Vietnam.

Cost estimation for Vietnamese construction projects

Actual installed cost depends on product grade, thickness, facing type, and labor. These figures are drawn from project documentation across Vietnam's major industrial provinces in 2025–2026 and reflect market pricing inclusive of supply, transport, and standard installation labor — not just material-only cost.

Nhà xưởng (factory/warehouse) roofing

Standard specification: 50mm faced fiberglass blanket insulation laid under corrugated steel (mái tôn). Installed cost range: 85,000–130,000 VND/m². For a typical 1,000m² factory roof, total budget: approximately 85–130 million VND. This roof insulation panel application is the single highest-volume use case for fiberglass in Vietnam's industrial park construction market.

Kho lạnh (cold storage) walls and ceilings

Specification: 75–100mm foil-faced rigid fiberglass insulation board, vapor barrier on warm side. Installed cost: 180,000–280,000 VND/m². Cold storage walls require both high R-value and effective vapor control — the foil facing on fiberglass board addresses both requirements simultaneously, making it a cost-competitive alternative to PIR foam panels for projects in the 0°C to 10°C operating range.

Mái tôn commercial and residential applications

25–40mm unfaced or foil-faced batt insulation between purlins. Installed cost: 55,000–90,000 VND/m². This is the entry point for energy-saving insulation material adoption in small-to-medium commercial construction and is where the volume of procurement decisions is highest in Vietnam's Tier 2 and Tier 3 cities.

Installation guide for Vietnam's tropical climate

Installing fiberglass insulation sheet in Vietnam is not identical to following a European or North American technical manual. The combination of year-round high humidity, tropical heat, and monsoon season introduces failure modes that generic installation guides do not address. Based on site observations from projects in Ho Chi Minh City and Da Nang, here is what a correct installation process looks like.

Step-by-step installation for mái tôn roofing

1. Substrate inspection: Verify all steel purlins are free of corrosion, sharp edges, and standing water before any insulation is unrolled. Sharp metal edges will compromise the facing integrity within one monsoon season.
2. Vapor barrier placement: In Vietnam's climate, the vapor drive is nearly always from outside in (hot, humid exterior to cooler conditioned interior). Install a polyethylene vapor retarder on the exterior (warm) side of the insulation layer — this is the opposite of cold-climate convention and a common installation error.
3. Insulation laying: Unroll fiberglass batt insulation perpendicular to the purlins. Maintain full contact without compression — a 50mm batt compressed to 35mm loses approximately 30% of its rated R-value. Butt joints tightly; do not overlap.
4. Fastening: Use galvanized or stainless steel clips and wire ties rated for the product weight. In coastal areas (Vung Tau, Da Nang, Hai Phong), only 316-grade stainless fasteners are acceptable — standard galvanized clips corrode within 2–3 years in salt-laden humid air.
5. Joint sealing: All seams in the facing material must be taped with aluminum foil tape rated ≥ 72 hours peel-adhesion at 40°C. Untaped seams allow moist air infiltration, which degrades the insulation and promotes mold on adjacent structural surfaces.
6. Steel cladding installation: Install corrugated steel sheets immediately after insulation is secured. Do not leave exposed fiberglass batt insulation uncovered overnight during the wet season — absorbed moisture reduces performance and is difficult to dry out once the roof is closed.
7. Final inspection: Check for voids, compression points, and unsealed seams before sign-off. A thermal camera inspection at dawn (when the temperature differential is highest) is the most reliable quality control method for large roof areas.

Monsoon season precautions

Think of fiberglass insulation like a high-performance sponge — its thermal value depends entirely on the air pockets within the fiber matrix remaining dry. Monsoon rains in southern Vietnam deliver over 1,800mm of annual rainfall, and even small gaps in cladding can allow enough moisture ingress to reduce effective R-value by 20–40% within a single wet season. Always prioritize sealed facing products (foil-faced or kraft-faced wall insulation board) over bare unfaced product for exterior applications in any Vietnamese climate zone.

Health and safety handling guidelines

This is the topic that almost no Vietnamese-market supplier guide addresses honestly. Fiberglass fibers — particularly from older or lower-quality product — can cause temporary but significant irritation to skin, eyes, and the upper respiratory tract. The risk is manageable with basic precautions, but workers who handle large quantities of fiberglass blanket insulation or cut rigid boards daily deserve to understand it clearly.

Personal protective equipment (PPE) requirements

Minimum PPE for any cutting, fitting, or installation work with fiberglass insulation sheet: long-sleeve shirt and trousers (synthetic fibers repel glass particles better than cotton), nitrile or latex gloves, safety goggles (not standard glasses — side shields are required), and an N95 or P2 dust respirator. A P100 half-mask respirator is recommended for workers spending more than two hours per day in close contact with product. According to guidelines on insulation and indoor air quality published by the U.S. EPA, glass fiber particles are classified as nuisance dust rather than a known carcinogen under current exposure levels — but the precautionary principle still applies, particularly for sustained occupational exposure.

Safe cutting and handling practices

Cut fiberglass insulation sheet with a sharp utility knife or serrated blade in a single smooth pass — sawing back and forth generates significantly more airborne fiber than a clean cut. Always cut in a direction away from the body. Work in ventilated areas or outdoors when possible; in enclosed spaces, use local exhaust ventilation. After handling, wash exposed skin with cold water first (hot water opens pores and traps more fibers), then soap. Do not rub skin — pat dry.

Workers with pre-existing asthma or chronic respiratory conditions should consult a physician before regular fiberglass handling duties. This is a practical safety measure, not an exaggerated risk — but it is genuinely rarely mentioned in Vietnamese construction site safety briefings, and it matters.

2026 trends and TCVN/QCVN compliance

The Vietnamese construction insulation market is moving faster than many procurement teams realize. Two structural forces are reshaping what products get specified and what compliance documentation gets demanded at project handover.

TCVN and QCVN compliance requirements

The primary energy efficiency standard for Vietnamese buildings is QCVN 09:2017/BXD (National Technical Regulation on Energy Efficient Buildings). It mandates minimum thermal resistance values for roofs, walls, and glazing across Vietnam's three climate zones. For energy-saving insulation material used in QCVN-compliant designs, suppliers must provide test certificates confirming declared λ values under TCVN ISO 8301 or TCVN ISO 8302. Fire performance documentation must reference TCVN 9311:2012 or an accepted equivalent (EN 13501-1 is widely accepted by Vietnamese authorities). When evaluating suppliers, always request both documents — the thermal test certificate and the fire classification certificate. Missing either one creates liability at the PCCC inspection stage.

Key 2026 market trends

Industry consensus in 2026 points to two accelerating developments. The first is green building certification pressure: LEED and EDGE-certified projects now represent a meaningful share of new Grade A commercial and industrial construction in Vietnam, and these certifications require insulation products to contain a minimum percentage of recycled glass content — typically 30–50%. Specifying a product that cannot supply a recycled content declaration now risks disqualifying the entire insulation package from certification credits.

The second trend is aerogel composite panels — ultra-thin fiberglass insulation sheet products combining glass fiber substrate with aerogel fill, achieving λ values as low as 0.018 W/m·K. These products are entering Vietnam through premium industrial and cold-chain projects where space constraints make conventional thickness impractical. Prices remain 3–5× higher than standard product, but they are a legitimate option for kho lạnh retrofits where adding 100mm of conventional insulation is structurally or spatially impossible.

Frequently asked questions about fiberglass insulation sheet

What thickness of fiberglass insulation sheet is recommended for a Vietnamese factory roof?

For a nhà xưởng in southern Vietnam without air conditioning, 50mm fiberglass blanket insulation (λ ≤ 0.040 W/m·K) is the standard minimum. For climate-controlled spaces in central or northern Vietnam, 75–100mm is more appropriate to meet QCVN 09:2017/BXD energy efficiency requirements and reduce long-term cooling costs.

Is fiberglass insulation sheet waterproof?

Bare, unfaced fiberglass insulation board is not waterproof — glass fibers absorb moisture, which directly degrades thermal performance. Foil-faced or kraft-faced variants provide a vapor retarder function, but they are not a substitute for proper waterproofing membranes. In Vietnam's climate, always use faced product for any application exposed to humidity or condensation risk.

How does fiberglass insulation sheet perform compared to rockwool for fire safety?

Both fiberglass insulation sheet and rockwool are classified as non-combustible materials (Class A1 or A2 under EN 13501-1 and equivalent TCVN 9311 classification). Neither material supports flame propagation or releases significant toxic smoke. For standard Vietnamese fire inspection purposes, a certified fiberglass product meets the same fire compliance requirements as rockwool in most building applications.

Can fiberglass insulation sheet be used in kho lạnh (cold storage) applications?

Yes, with correct specification. Foil-faced rigid fiberglass insulation board at 75–100mm thickness is suitable for cold storage operating at 0°C to 10°C. For blast freezer rooms operating below -18°C, PIR or PUR polyurethane panels are generally preferred because of their higher R-value per unit thickness and better performance at extreme cold. A professional thermal engineer should confirm the specification for any kho lạnh project.

What documents should I request from a fiberglass insulation sheet supplier in Vietnam?

Request: (1) thermal conductivity test certificate per TCVN ISO 8301/8302, (2) fire classification certificate per TCVN 9311:2012 or EN 13501-1, (3) product datasheet with declared density and R-value per stated thickness, (4) recycled content declaration if LEED/EDGE certification is required, and (5) safety data sheet (SDS) for handling and disposal. Reputable suppliers should provide all five without hesitation.

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