Key takeaways
- Measure the width at three heights and use the smallest - garage openings are not square.
- Measure the headroom above the opening before buying; the track needs a place to sit.
- The track must be level along its length and square to the opening.
- The panel should overlap the opening by an inch or two on each side.
- Leave a business card of clearance at the bottom - enough to slide, not enough to see through.
Most installations go wrong before any drilling, because the three measurements were taken at the wrong place. Get the width, the height and the headroom right, and the fitting takes two people about an hour. Get them wrong, and you will be drilling again next weekend.
Measure before you buy
Measure the opening at three heights - top, middle and bottom - and use the smallest width you get. Garage openings are rarely square, and a screen that fits at the bottom will bind at the top. Measure the height on both sides for the same reason. Then measure the headroom above the opening: the track has to have somewhere to sit, and a door that opens close to the ceiling may not leave room for it.
Track level, both directions
The track has to be level along its length and square to the opening. A track that is level but crooked will make the panel drift to one side and jam. Check with a spirit level before you commit to the screws, and pack the track if the floor or the header is not true.
If the panel binds after installation, the cause is often the same one behind a screen door that jams.
Panel overlap and the bottom gap
The panel should overlap the opening by an inch or two on each side, so there is no gap to see through when it is closed. The bottom edge should clear the floor by just enough to slide - the width of a business card is the usual target. Too high and insects walk in; dragging and the panel wears through the mesh.
| Measurement | How | What it decides |
|---|---|---|
| Width | Top, middle, bottom - use the smallest | Which door size you order |
| Height | Both sides | Panel height and track position |
| Headroom | Above the opening | Whether the top track fits |
| Bottom clearance | Slide a business card under the panel | Insect gap against drag |
Two people, one hour
One person holds the panel square while the other fixes the top track. Then check the slide before you tighten anything fully. If it binds, loosen and shift rather than forcing, because a panel that is forced into a track will wear the rollers out in a season.
The bottom line
Measure the opening and the headroom before you buy, get the track level and square, and leave a business card of clearance at the bottom. The rest is one hour with a second pair of hands.
Frequently asked questions
How do I measure for a garage screen door?
Measure the width at the top, middle and bottom and use the smallest figure. Do the same for the height on both sides, and measure the headroom above the opening.
Why does my garage screen door jam?
Usually the track is level along its length but not square to the opening, so the panel drifts to one side. Check it with a spirit level and pack the track.
How much gap should be at the bottom?
About the thickness of a business card - enough to slide freely, not enough to let insects through.
Can one person install a garage screen door?
It is much easier with two: one holds the panel square while the other fixes the track, and the slide can be checked before the screws are tightened.
Related reading
- Garage screen door installation mistakes
- How to clean a garage screen door
- Garage screen door repair: what you can fix
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