Eps Foam Board

The scientific mystery of polystyrene board

Polystyrene board is composed of 98% air and 2% polystyrene. It is precisely this tiny solid framework that traps a large amount of still air, forming an outstanding insulation layer. Air is an extremely poor heat conductor. These trapped air cells form an efficient thermal barrier with a thermal conductivity of only 0.032-0.038W/(m·K). What does this mean? Compared with traditional building materials: The insulation effect of a 10-centimeter-thick polystyrene board is equivalent to that of a 1.5-meter-thick solid brick wall or a 1.2-meter-thick concrete wall!

Eps Insulation Board

 

The core advantages of polystyrene board

Outstanding heat preservation performance

The closed-cell structure of polystyrene board effectively prevents heat convection, reduces thermal bridge effects, and maintains a stable internal temperature of the building. In practical applications, buildings using polystyrene board external wall insulation systems can reduce heating energy consumption by 50-70% in winter and air conditioning energy consumption by 40-60% in summer.

Outstanding energy conservation and environmental protection benefits

From the perspective of the entire life cycle assessment, the energy consumption in the production of polystyrene boards is much lower than the energy saved during their usage stage. For every cubic meter of polystyrene board insulation material used, approximately 3,000 liters of fuel energy can be saved and about 7.5 tons of carbon dioxide emissions can be reduced during its 20-year service life. This is equivalent to the carbon emissions of a car traveling 30,000 kilometers

The physical properties of being lightweight and high-strength

The density of polystyrene board is usually between 15 and 30kg/m³, which is 1/50 of that of concrete and 1/40 of that of brick walls, greatly reducing the load on building structures. Meanwhile, its compressive strength can reach 100-150 kpa, which is sufficient to bear the weight of the exterior wall plastering layer and decorative layer.

Long-lasting and stable performance

High-quality polystyrene boards have excellent anti-aging performance. Under correct installation and maintenance, their service life can reach over 50 years. Its insulation performance decays extremely slowly over time, and it can still maintain more than 90% of its initial insulation value after 20 years.

Outstanding balance of moisture resistance and breathability

The closed-cell rate of polystyrene board is over 95%, effectively preventing liquid water from penetrating. At the same time, it allows water vapor to pass through slightly, avoiding condensation inside the wall and keeping the building structure dry and healthy.

Upgrade of fire safety

By adding flame retardants (usually substitutes for hexabromocyclododecane), polystyrene boards can meet the B1 grade flame-retardant material standard. More importantly, the correct installation method requires that fire isolation belts be set up on each floor and rock wool fireproof seals be used around the Windows to comprehensively and systematically ensure the fire safety of the building.

The application revolution of polystyrene board in green buildings

Under the global carbon neutrality goal, polystyrene boards are becoming the cornerstone technology for passive houses and zero-energy buildings. The German passive house standard requires that the annual heating energy consumption of buildings should not exceed 15kWh/m², which is almost only one-tenth of that of ordinary buildings in China! The core to achieving this goal lies in the design of an ultra-thick polystyrene board insulation layer (usually 20-40 centimeters) combined with air tightness.

 

Innovative application case: In the "Carbon Neutrality Demonstration Community" in Shanghai, architects used 30-centimeter-thick graphite polystyrene board (NEOPOR®) for exterior wall insulation, combined with three-layer glass Windows and a heat recovery fresh air system, reducing the building's annual air conditioning and heating energy consumption by 85%. This community reduces carbon emissions by approximately 1,200 tons each year, which is equivalent to planting 65,000 trees!

The main concerns of people regarding polystyrene boards focus on fire safety and environmental sustainability. Modern polystyrene board technology has made breakthrough progress:

Innovation in circular economy: The recycling technology of polystyrene boards is becoming increasingly mature. Physical recycling can regranulate waste polystyrene boards for the production of low-specification insulation materials or packaging materials. Chemical recycling can depolymerize polystyrene into monomers and re-produce virgin quality polystyrene boards. The recycling rate of polystyrene boards in Europe has risen from 25% in 2010 to 48% in 2023, with the goal of reaching 65% by 2030.
Bio-based alternatives: Cutting-edge research is developing alternatives to bio-based polystyrene boards, such as polylactic acid foamed materials extracted from corn and sugarcane. Although the current cost is relatively high, it points out the direction for a completely renewable future insulation material.

The saying "three parts materials, seven parts construction" is vividly reflected in the polystyrene board insulation system. The correct installation includes:

Base treatment: The wall surface should be clean and smooth, ensuring that the bonding area exceeds 40%
Interlaced tiling: Stick them at staggered seams like laying bricks to reduce thermal Bridges
Anchoring reinforcement: No less than 6 dedicated anchor bolts per square meter, with a wind pressure resistance safety factor of ≥1.5
Joint treatment: The joint of the board should be controlled within 2mm and filled with foam glue or insulation strips
Protective layer construction: Alkali-resistant glass fiber mesh fabric is embedded in the plastering mortar to enhance impact resistance
A common misunderstanding is that "polystyrene boards will make walls airtight." In fact, the water vapor wet flow density of high-quality polystyrene board systems can reach 1.5g/(m²·h), which is higher than the 0.5g/(m²·h) of traditional brick walls, ensuring the healthy breathing of the walls.

Facing extreme lows of -25°C, Yanqing's mountain venues adopted innovative "Graphite EPS + Vacuum Insulation Panel" composite systems:

Main walls: 25cm graphite EPS (λ=0.032W/m·K)

Thermal bridge areas: +3cm VIP (λ=0.008W/m·K)

Overall building energy efficiency: 82%, exceeding national standards by 35%

During Olympics: stable indoor temperatures 18-20°C, humidity 45-55%

Compared to conventional insulation: reduced thickness by 15%, increased usable area by 3.2%

First German Passivhaus Institute-certified kindergarten in East China:

Walls: 30cm graphite EPS, U-value=0.12W/m²·K

Roof: 40cm insulation, ground: 25cm

Air tightness: n50=0.31/h (Passivhaus standard: 0.6/h)

Annual heating demand: 14.3kWh/m², cooling: 15.1kWh/m²

Indoor CO₂ consistently <800ppm, PM2.5 filtration: 95%

Annual operational savings: ≈¥180,000, payback period: 7.2 years

Xinjiang Building Research Institute's 15-year monitoring of 2008 EPS buildings:

After 15 years: exterior system integrity score: 86/100

Thermal performance decay: only 8.7% (design expectation: 20%)

After 15 years of thermal cycling (annual ΔT up to 70°C): no detachment or cracking

Anchorage system retained 92% of initial wind load resistance

Provides valuable data for EPS applications in extreme climates

According to the Chinese national standard GB/T 10801.1-2021, EPS boards for construction are classified into six grades (from 080 to 250) based on compressive strength, three grades (from 2% to 5%) based on dimensional stability, and three grades B1, B2, and B3 based on combustion performance. The EU standard EN 13163 adopts a more comprehensive classification system, including 10 key performance indicators.