What are U values?

What are U values?

U value is a measure of the heat loss through a building element.

The higher the U value the more heat is lost through that individual element.

To get an external door with a U value calculation you need to purchase a doorset – door and frame - the whole assembly needs to be calculated to ensure Building Regulation compliance.  The performance given for a door alone will change when fitted into a frame and would need to be recalculated by an approved simulator.