Garage Doors in Sawlog Bay, OntarioButton, keypador phone.

The route is the same and the counterbalance looks different. Extension springs stretch beside the horizontal tracks and pull through pulleys, so the technician examines each spring for stretch and a broken end, each pulley for a grooved wheel or a seized bearing, the cable clips, and whether a containment cable runs through the centre of each spring. Balance, reversal and photo-eye tests are unchanged.

Springs are inspected and lubricated during a tune-up, and the balance test tells us whether they are carrying the door's weight properly. Changing their tension is a separate, deliberate job: the door is clamped to the track, winding bars are used on a torsion spring, and the technician works from a stable position. If the balance check shows the springs need adjustment or replacement, you receive that as its own recommendation with its own quote.

The names describe the edge that grips the retainer and the shape of the part that meets the floor. A T-style seal has T-shaped edges that slide into slotted channels along the bottom rail. A bead seal has round edges for the rounder channels found on many older steel doors. A bulb, or U-style, seal is a larger tube that compresses further and suits rough or dished floors. The retainer on your door decides which one fits.

Slush carried in on the tires collects in the foot of the track and refreezes overnight, so wheels skid across ice ridges instead of turning and wear flat spots; cold thickens old grease so bearings stiffen and the opener strains; and the salt in that slush corrodes steel stems, bearings and the bottom brackets first. This is why the lowest rollers often look the worst and why sealed-bearing nylon rollers, and a clear, dry lower track, are recommended for garages that see a car every winter day.

Usually the standard two-inch track handles a residential insulated door well, provided the gauge matches what the door maker specified and the brackets and hangers are properly fixed. Very heavy or oversized doors, and some carriage-style wood doors, are set up on three-inch track or on heavier-gauge two-inch. If a heavier door was hung on the light track from an earlier door, flexing and spreading follow, and the technician will say so.