Why heavier doors need properly matched springs
A wide insulated or glass-panelled door can weigh a good deal more than a standard one. The springs are what carry that weight, and they are sized for a specific door. If someone replaced a door without changing the springs, or fitted a different panel later, the balance can drift.
Signs include an opener that labours, a door that crashes down rather than closing smoothly, and a loud bang when a spring lets go. Because North York has so many rebuilt homes with large openings, we often see springs that were chosen to fit rather than to match.

