Thermal insulation by injection of urea foam in building structures

This report gives information concerning improvement of thermal insulation in existing buildings by injection of urea foam in hollow portions of the structures. When performed and used correctly, insulation with urea formaldehyde resin foam can result in considerably improved thermal insulation, both in structures with high heat transfer coefficients (K-values) and in structures where the thermal insulating capability is impaired by air flow through fissures and slits.