Technicians spraying polyurethane foam on a concrete roof in Riyadh

What is SPF?

Spray polyurethane foam is sprayed as a liquid, expands instantly and cures into a seamless rigid layer that insulates and waterproofs in one application, ideal for warehouses, factories and large roofs.

Technical properties

  • Density 30–50 kg/m³.
  • Thermal conductivity 0.022–0.028 W/m·K.
  • Compressive strength 200–350 kPa.
  • Water absorption below 1%.
  • Service life 15–25 years with UV protection.
Wide metal roof fully covered with white foam insulation
Uniform foam coverage on a metal roof

Success factors

  • Exact A/B mix ratio.
  • Application temperature roughly 10–35 °C.
  • Dry substrate.
  • Mandatory UV-protective acrylic coat.

FAQ

Does foam need a top coat?

Always. Exposed foam degrades within one to two years without acrylic protection.