Why Polyurethane Insulation Is Key to Net-Zero Buildings
- ial
- Mar 26
- 3 min read
Net-zero buildings are designed to use as little energy as possible, with well-insulated walls, roofs and windows that keep heat in during winter and out during summer. This reduces the need for heating and cooling systems. Any remaining energy needed is supplied by renewable sources. A zero-emission building emits no carbon from fossil fuels and has excellent energy efficiency.
Reducing energy demand in buildings is so important in meeting carbon emissions and reducing reliance on fossil fuels. Polyurethane insulation offers outstanding thermal performance and helps keep buildings well sealed against unwanted draughts and heat loss, making it a key material in net-zero building design. In practice, high-performing polyurethane insulation allows designers to significantly cut down the amount of energy a building needs for heating and cooling.
Thermal Performance of Polyurethane Insulation
Polyurethane insulation, in the form of a spray foam or rigid board foam material, is made by combining polyols and isocyanates; these react together to form a dense, high-performing foam. It is growing in popularity within the construction industry.
Compared to more traditional insulation materials such as mineral wool or EPS boards, polyurethane insulation offers a noticeably higher level of thermal performance. It is highly effective at reducing heat loss, preventing draughts, and keeping moisture and damp at bay. Its closed-cell structure gives it excellent compressive strength, meaning it holds up well under pressure and lasts a long time. It is also lightweight and can adapt well to different surfaces and building types.
In terms of thermal performance, polyurethane insulation has exceptionally low thermal conductivity, which ranges from 0.022 to 0.028 W/mK, and has a density of 35 - 50 kg/m³. Polyurethane foams deliver very high R-value per inch; closed-cell spray foam typically provides about R-6 to R-7 per inch, and rigid polyiso board around R-6.5 per inch. This places it among the most thermally efficient insulation materials.
Polyurethane is most widely used for the following applications:
- Dry lining plasterboard for internal solid wall insulation where space is limited
- External/cavity wall insulation
- Suspended/floating floors
- Pitched roofing for residential, agricultural and commercial buildings
- Cold stores and food process plant
- Refrigerated transport
- Blown in-situ for flat roofs, storage tanks, windows and pipe work
- Domestic and commercial refrigerators
As the European Union continues to tighten its regulations on net-zero buildings, demand for polyurethane insulation is rising steadily. Across the EMEA region, the market is projected to grow at a compound annual growth rate (CAGR) of 3.0% between 2025 and 2029, driven by the increasing need for high-performance insulation solutions in energy-efficient construction.
Polyurethanes (PU and PIR) are thinner and more efficient than many alternative insulation materials, making them well suited to applications requiring high thermal performance. Demand for PU insulation is further supported by the introduction of more stringent flammability regulations. In addition, PU insulation offers several technological advantages, including enhanced insulation efficiency, strong pressure resistance and improved heat resistance, particularly for roofs exposed to temperatures exceeding 80°C.
Research for this study was carried out in mid-2025. Data are provided from 2024 to 2029, with the base year 2024.
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