What Is a PIR Sandwich Panel?
PIR Sandwich Panel is a structural insulated panel made of three layers: a low-density core of Polyisocyanurate (PIR, polyiso, or ISO), and a rigid thin skin layer bonded to each side.
PIR sandwich panel has an R-value of 6.5-7.2 per inch; therefore, the highest insulation performance can be achieved with the PIR sandwich panel building envelope. The thermal resistance is mainly due to the Polyisocyanurate (PIR) core insulating properties, metal steel sheets, and airtight design, which form an effective thermal barrier against extreme temperatures, while eliminating air infiltration and thermal bridging. Besides, Polyisocyanurate (PIR, polyiso, or ISO) is typically produced as foam and used as rigid thermal insulation. Given its strong chemical bonds and molecular structure, Polyisocyanurate (PIR) has greater stiffness and strength than other insulation materials like Polyurethanes (PU); these characteristics make it thermally resistant and chemically stable.
What Is the Purpose of PIR Sandwich Panels?
PIR sandwich panels are widely used for building applications where a combination of high structural rigidity and weight-saving is essential. These lightweight PIR prefabricated structural components are also ideal for space optimization and where minimum thickness and high thermal resistance are required. These characteristics make them preferred for various applications including:
Residential Building
Private dwellings, prefab houses, villas, modular residential buildings, apartment buildings, hotels, dormitories, etc.
Commercial Building
Commercial complexes, shopping malls, hypermarkets, convenience stores, and office buildings.
Industrial Buildings
Industrial steel buildings, prefab manufacturing plants, large-span prefabricated factory buildings, production buildings, logistics centres, warehouses & enclosed buildings, food industry facilities, etc.
Agricultural Buildings
Agricultural structures, farm sheds, stables, livestock barns and shelters (poultry, pigs, cattle, goats …), dairy & milking facilities, food processing buildings, machinery and equipment storage, etc.
Temperature Controlled Buildings
Clean rooms, cold storage rooms, walk-in freezer rooms, freezer compartments, walk-in chiller rooms, and negative temperature cold rooms.
Sport Buildings
Stadiums, sports arenas, multi-purpose courts, gymnasiums, and sports halls.
Community Buildings
Hospitals, clinics, classrooms, schools, universities, and other public buildings
Other Applications
Aircraft structural components, aeronautical applications, airport buildings, and more.
What Are the Applications of PIR Sandwich Panels?
Sustainable construction is fueling the demand for PIR sandwich panels, given their thermal insulation and cost-efficiency; they have become the top choice for various applications including:
- Walls (internal and external walls) and partitions
- Compartmentalization of interior spaces
- Roofs, facades, architectural cladding
- Building envelopes and external enclosure
What Comprises a PIR Sandwich Panel?
PIR sandwich panel is a three-layer structure consisting of an inner Polyisocyanurate (PIR) core sandwiched between two sturdy outer layers:
PIR Insulation Core
A PIR insulation core is a low-density structural foam made of a thermoset plastic; it is typically used as rigid thermal insulation and carries transverse shear loads. Polyisocyanurate foam (PIR) density ranges between 30 kg/m³ and 45 kg/m³ and has a thermal conductivity value of 0.023 W/(m·K). Polyisocyanurate is also referred to as (PIR, polyiso, or ISO).
Skin layers
PIR sandwich panels consist of two thin skin layers (facings) which are glued to the internal and external sides; these two facings are designed to resist the in-plane forces and out-of-plane compressive load. PIR sandwich panel layers are essentially made of high-strength galvanized steel sheets, stainless steel plates, aluminum sheets, etc.
What Are the Types of PIR Sandwich Panels?
PIR sandwich panels are categorized into different types based on the selected material, thickness, and usage. There exist several types of PIR sandwich panels that suit any building application, including interior and exterior walls, roof, ceiling, façade cladding, and building envelope. PIR sandwich panels are multifunctional and come in various types as follows:
- Wall PIR sandwich panel (interior & exterior wall, solid masonry walls, timber frame walls, or between timber frame studs)
- Roof PIR sandwich panel (Pitched roofs)
- Floor PIR sandwich panel – screed, concrete slab, and timber joist floors
- Façade PIR sandwich panel
- Building envelope PIR sandwich panel
- PIR corner sandwich panel (edges of the building metal cladding)
- Cold store PIR sandwich panel
- Refrigerated PIR sandwich panel
- PIR sandwich panel for timber frames or steel-framed systems
- PIR sandwich panel with standard fastening system
- PIR sandwich panel with hidden fastening system
What is the R-value of the PIR Sandwich Panel?
The R-value of PIR sandwich panels measures the material’s thermal resistance to heat flow and ranges between 7 and 7.2 per inch; however, the R-value of the PIR sandwich panel depends mainly on the thickness of the PIR core. The higher the R-value, the greater the thermal resistance of PIR sandwich panels.
What Are the Benefits of PIR Sandwich Panels?
PIR sandwich panels have become the first choice for real estate developers, architects, and general contractors from all over the world, thanks to the attractive and durable material which offers various benefits including:
Thermal Resistance
PIR sandwich panels are excellent thermal envelopes for residential, commercial, industrial, and cold storage buildings and structures, thanks to the closed-cell structure, rigid PIR insulation core, and robust metal facings which offer very low thermal conductivity and high thermal performance, and help improve the energy efficiency of different structures, reduce heating and cooling costs, these thermal resistance characteristics make it a better insulation for the construction and building industry.
Energy-Efficiency
PIR sandwich panels offer a high thermal performance that maximizes energy efficiency and reduces energy consumption for heating during winter and cooling in summer, which saves energy and minimizes significant costs for the long term, besides this, PIR sandwich panels from a strong thermal barrier against environmental factors such as extreme temperature, rain, wind, and moisture, thanks to the superior thermal properties, weather-sealed composites and tight joints which ensure superior insulation even in extreme weather conditions.
Rigidity and Lightweight
PIR sandwich panels combine strength and weight balance due to the two thin, stiff skins that are strongly bonded to a lightweight thick core. PIR sandwich composites can offer great rigidity and low weight; at the same time, they reduce the cost of transport, handling, and installation and also make assembly easy and fast. However, the PIR core density and thickness of the skin layers determine the weight of PIR sandwich panels, while its structural integrity and strength depend on its resistance to bending. The rigidity and lightweight characteristics of PIR sandwich panels determine the capacity of building envelopes and roofs to withstand large amounts of snow, heavy rain, and other harsh environmental factors.
Environmentally-Friendly
PIR sandwich panels can meet the highest green building standards, a vital component in green buildings, because of their thermo-insulating material and air tightness; these PIR insulated sandwich panels (ISPs) can maximize the energy efficiency of a wide range of buildings while making the construction process more sustainable; they are unlike other conventional materials, which require more water, energy, and machinery. Moreover, PIR sandwich panels can be reused or recycled after usage; the metal sheet can be melted, while the Polyisocyanurate (PIR) insulation is normally recycled using different types of techniques such as mechanical recycling, chemical, thermo-chemical degradation, and incineration with energy recovery.
Hygienic
PIR sandwich panels are mainly used to build healthcare buildings and structures, due to their antibacterial properties, food-safe coating, and water tightness, PIR sandwich panels can effectively reduce airborne micro particles, environmental pollutants, and bacteria, hence, PIR sandwich panels can guarantee a hygiene-safe environment for a wide a range of applications where hygienic and sanitary standards is an essential requirement for sectors such as food processing plants, temperature-controlled environments, deep freeze, clean rooms, ambient or elevated temperature storage rooms, bio-containment modules, medical & pharmaceutical facilities, laboratories, etc. Also, the PIR sandwich panel surface can be easily cleaned and kept in hygienic conditions.
Are PIR Sandwich Panels Corrosion Resistant?
Yes, the PIR sandwich panel is a corrosion-resistant factory-engineered composite. Due to the corrosion-resistant material, PIR sandwich panels can withstand corrosion caused mostly by corrosive environments, harsh weather conditions, atmospheric impact, chemicals, and mechanical damage. PIR sandwich panels can be manufactured according to the needs of a given environment; it is available in the following anti-corrosion skin layers:
- Galvanized steel sheet
- Polymer-coated galvanized steel
- Pre-lacquered smooth sheet
- Aluminum sheet
- Stainless steel layers
- Fiber-glass facings
Furthermore, protective coatings such as Polyester (PE), Polvinylidene fluoride (PVDF), Plastisols, PVC, Food safe, and Organic coating can be applied to the panel surface to protect the surface from rusting or corroding. These corrosion-resistant characteristics make PIR sandwich panels preferred for the most aesthetically pleasing building envelopes, external facades, and cladding structures exposed to highly corrosive environments.
Are PIR Sandwich Panels Fire-resistant?
A PIR sandwich panel is a robust fire protection solution that offers superior fire resistance to various building types, including:
Residential, Commercial, Industrial, and Community Buildings
Temperature-controlled environments, clean rooms, cold rooms, and cold storage buildings. Medicines, pharmaceutical, and biotechnology industries manufacturing facilities.
Food and Beverage Processing Plants
Polyisocyanurate foam (PIR) is a fireproof material that contains fire retardants and halogen-free flame retardants, in the event of a fire, the PIR foam reacts safely to fire by forming a carbonized surface layer that protects and prevents the penetration of fire into the inner layers, therefore, PIR sandwich panels are fire safe and doesn’t contribute to the fire, even when the PIR insulation core is directly exposed to a fire source. Also, PIR-cored insulated panel can maintain integrity during a fire for up to EI 60 (according to EN 13501-2), all the material is tested to withstand fire propagation even on fire severity, while it is conformant to the highest standards including:
- FM 4471 test standard looks at fire
- FM 4880 and 4881 fire performance standards
- Reaction to fire B-s1,d0 (according to EN 13501-1)
- ASTM E108 fire-test-response standard for residential and commercial roof coverings
Are PIR Sandwich Panels Compliant with the International Building Code?
PIR sandwich panels are completely compliant with international building codes, including mechanical code, electrical codes, plumbing, fire prevention, and energy conservation. Given their high-strength, load-bearing material, PIR sandwich panels can withstand natural hazard events such as seismic, wind uplift, hail, hurricane, flood, fire, structural failure, and other destructive forces without compromising the building structure. Also, the PIR sandwich panel is conformant to the highest international building standards of structural integrity and building envelope performance, safety, and general welfare.
Are PIR Sandwich Panels Easy and Fast To Assemble?
PIR sandwich panels are easy and fast to assemble; all the panels are made according to the building layout drawings and detailed specifications and come ready for quick and simple assembly. PIR sandwich panels are designed with tongue-and-groove joints; visible joints or hidden joints can be used depending on the finish, while they can be assembled using self-drilling screws (visible or concealed screws) and joint sealing, which makes the construction time shorter compared to other conventional building materials, which take several months for completion.
PIR sandwich panels are versatile structural composites and are excellent for external and internal walls, partitions, facades, and building enclosures; they are also ideal for single- or multiple-span shell structures. PIR sandwich panels are normally handled and installed using simple lifting equipment like loading and unloading tools, vacuum lifters, scaffolding, etc.
What Are The Features Of PIR Sandwich Panels?
Polyisocyanurate (PIR) sandwich panels are available in a wide range of textures, finishes, and colors that can match any type of building including residential buildings, commercial facilities, and industrial structures, these aesthetically appealing architectural panels come with thermally resistant insulating core, and a weather-tight metal skin layers, facing profiles comes with a variety of attractive features including smooth, stamped, micro profile, linear, corrugated, trapezoidal and. Also, PIR sandwich panels can be installed vertically, horizontally, or at a slope.
Frequently Asked Questions
1. Are PIR panels suitable for cold rooms?
Yes. PIR sandwich panels are widely used in cold rooms, refrigerated warehouses, walk-in chillers, freezers, and other temperature-controlled facilities because they combine high thermal resistance with a lightweight, prefabricated panel construction.
2. What PIR panel should I choose?
It depends on the required temperature, ambient conditions, and insulation target. Lower temperature rooms usually require thicker panels.
3. What are PIR sandwich panels made of?
They consist of a PIR foam core bonded between two metal facings.
4. Are PIR sandwich panels fire-resistant?
PIR has better fire performance than conventional PUR, but it is not fire-resistant or fireproof.
5. Can PIR panels be used for walls and roofs?
Yes. PIR panels are available for walls, roofs, ceilings, partitions, and cold rooms.
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