Door AND frame injected with polyuerethane insulation.
Part L compliant – U value 1.8W/m2K
Other door suppliers often overlook insulation, and they use cheap material to insulate their doors. For example, when used in a steel security door, mineral wool and honeycomb paper insulation often do not meet the requirements for U-values. However, an accredited laboratory has confirmed the U-value of the Kirncroft security door, using the correct method of calculating the door and frame as a complete unit. By using polyurethane insulation, our security doors are both structurally reinforced and meet thermal performance requirements.