What storm runoff down a sloped driveway does to a garage door
On a Dunwoody lot that falls away from the street, or a split-level with the garage on its lowest floor, the driveway works as a channel. A summer thunderstorm sends water and red clay down it, and the first thing in its way is the garage door.
Why does a garage at the bottom of a sloped driveway wear its door from the bottom?
The runoff stops at the threshold, and the threshold is where a garage door keeps its wearing parts. The bottom brackets and the cable ends sit there, along with the lowest rollers, the foot of each track and the bottom seal. The springs overhead stay dry. When the wear finally shows, it is usually a cable letting go at the bracket, the job behind off-track and cable repair in Dunwoody.
A garage at the top of its driveway sheds rain onto the slab, and the slab sheds it away. A garage at the bottom sits in whatever the whole driveway collected, and on Georgia clay the water carries the soil along with it. After a hard storm, a line of orange silt along the threshold shows how far it reached.
What does standing water at the threshold do to the cables and bottom brackets?
Each lift cable ends at a bottom bracket a few inches off the slab, so it sits in whatever pools at the door. Wet and dry by turns through a Georgia summer, the steel strands rust where they bend at the bracket and break a few at a time while the cable still looks sound at eye level.
When enough strands go, that side of the door stops lifting and the other side keeps going. The door racks and the rollers come out of the track.
The bracket itself rusts in the same puddle. On a wood door its screws also sit in a bottom rail that rarely dries out, and they loosen. Both cables are replaced together, with the drums checked and the door rebalanced, for $150 to $260.
Why do the lowest rollers and the foot of the track go first on a wet garage?
The bottom roller on each side spends every closed hour in the corner where the water collects, and the foot of each vertical track is where grit settles. A steel roller’s bearings rust there until the wheel stops turning. It slides instead, dragging against a track foot that is rusting and roughening underneath it, and the opener works harder at the start of every lift.
Sealed nylon rollers stand up to a wet corner better than the old steel ones. A roller that drags through the first foot of travel adds its load to the cables at the point in the lift where they already carry the most weight.
What does red clay washed down the driveway do to a garage door?
Georgia’s red clay rides the runoff as fine silt and settles wherever the water slows, which at a garage means the threshold and the foot of each track. Wet, it is slick. Dry, it sets hard, and a door is then closing every night onto a ridge that was not there in the spring.
What that looks like once it has dried:
- The door stops an inch or two short of the floor, or the opener reads the ridge as an obstruction and sends the door back up.
- Clay packed into the track feet makes the bottom rollers climb over it, so the door shudders through its last foot of travel.
- The bottom seal closes onto a hard, uneven crust instead of bare concrete, and the water that follows runs in underneath it.
- Splashed safety sensors at floor height can keep the opener from closing the door at all.
Will a new bottom seal keep the runoff out?
Some of it. A fresh bottom seal, and a threshold strip glued to the slab, stop the thin sheet of water that runs across the edge of the driveway in an ordinary storm. They cannot stop a driveway that drains to the door. If water stands against the door after every heavy rain, the answer is a drain at the foot of the driveway or a regrade, and that is a concrete or drainage contractor’s call.
A seal that has spent a summer pressed into clay has usually hardened and split along its length. A new bottom seal with the side stops runs $90 to $180, and it is worth doing at the same visit as cables if both are due. The price page shows what seal and cable repairs cost here alongside the rest of the Dunwoody repair list.
What does the wet corner mean for a wood door, and for a steel one?
On a wood door the bottom section softens first, starting at the corners where the water sits longest. Whether that door is still worth repairing is a separate question, answered in repair or replace a Dunwoody garage door.
A steel door shows the wet corner as rust along the bottom edge and up the inside face of the bottom section, the side nobody looks at and the side the standing water touches. Rust that has eaten through the skin is a section that needs replacing, and a single section can only be swapped while the manufacturer still makes that model. A 1990s steel door whose model was discontinued has no matching bottom section left to buy, so a rusted-through bottom edge on one usually means pricing a new garage door.
When it is time to call: off-track and cable repair in Dunwoody, same day when the schedule allows.