Urea-formaldehyde foam insulation

Urea-formaldehyde foam insulation is a type of indoor insulation made from a mixture of urea and formaldehyde chemicals that expand into foam when injected into walls or cavities. It provides effective thermal insulation by filling gaps and reducing heat transfer. However, over time, it can release small amounts of formaldehyde gas, which may cause indoor air quality concerns. Due to health and environmental considerations, its use has become less common, replaced by safer, modern insulation materials. Proper installation and ventilation are important if this insulation has been used in a building.