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Exterior Wall Spray Coating Solutions

◣ Building Energy Efficiency in the Context of the Dual Carbon Goals

According to the “China Building Energy Consumption Research Report (2020),” in 2018, the total energy consumption of the building sector accounted for 46.5% of the nation’s total energy consumption, while its carbon emissions represented 50.6% of the country’s total emissions. Achieving the “dual carbon” goals hinges on advancing energy efficiency in the building sector, which remains an indispensable hurdle.

Among these, building insulation is a crucial component of energy efficiency and low‑carbon development in the construction sector. As a building insulation material, polyurethane offers significant advantages in terms of reduced carbon emissions and superior thermal performance, making it widely adopted in numerous ultra‑low‑energy projects. In passive house initiatives championed by developed countries, polyurethane stands out as the most ideal and extensively used envelope material.

◣ Performance Comparison Between Polyurethane and Other Materials

Polyurethane is currently the most widely used insulation material. Compared with traditional insulation materials, it boasts lower water absorption, fire resistance, superior thermal insulation, enhanced strength, and excellent weatherability, enabling compliance with a 75% energy‑saving standard through thinner, more stable insulation systems.

	Density	Thermal conductivity	Water absorption rate	Fire prevention	Product Features
Polyurethane	35-55	≤0.024	Lower ≤3%	Not lower than B1	Excellent thermal insulation performance, strong adhesion with no delamination, thermosetting and flame-retardant, and seamless bonding to the wall.
Polystyrene board	18-25	≤0.039	Lower ≤3%	Not lower than B2	Low cost, but prone to delamination from the wall and poor weather resistance.
Phenolic resin	50-70	≤0.035	Moderate ≤5%	Not lower than B2	This insulation material exhibits extremely poor weather resistance, with severe chalking in the later stages.
Rock wool	140-160	≤0.04	Relatively high	Grade A	High fire resistance, but poor thermal insulation.
Rock wool	180-200	≤0.06	Relatively high ≤10%	Grade A	High fire resistance and relatively high water absorption.