Most two-car garages in this metro have one wide door, because that is what builders fit. It is quicker to install, it is one opener, and it looks like every other house on the street.
When the door finally needs replacing, that is the one moment the configuration is actually open for discussion, and almost nobody realises it. Both options are legitimate. They are different machines with different consequences.
What a sixteen-foot door has to do
Understanding the engineering makes the comparison much easier.
A double-width section is a long thin panel supported only at its two ends. When it is horizontal on the ceiling tracks, it is a beam spanning sixteen feet with nothing under the middle. That is why wide doors have struts: horizontal reinforcing bars across the back of each section, whose only job is to stop the middle sagging.
It also means everything scales up. Heavier springs, heavier cables and drums, heavier hardware, and more force through the two track systems at the sides. A wide insulated double with glazing can be well past 400 pounds.
Two eight-foot doors, by contrast, are two independently short spans. Each section is carrying itself over half the distance, so far less reinforcement is needed and every component is in a lighter duty class.
The honest case for one wide door
- Access. One sixteen-foot opening is a genuinely wider hole. Getting a large truck in, or manoeuvring a trailer, or carrying something bulky, is easier with no centre post.
- One of everything. One opener, one set of springs, one remote, one door to maintain and one to replace.
- Lower installed cost, usually. One door and one opener is generally less than two of each, and it is what most quotes will assume.
- It matches the street. On a new-build street where every elevation is a wide door, two singles can look deliberate in a way not everybody wants.
The honest case for two singles
- Redundancy. This is the strongest argument and it is rarely made. When a spring goes on a double, the garage is closed. When one goes on a pair, you have a garage with one car in it and one car out, which is a Tuesday rather than a crisis.
- Lighter everything. Lighter doors, lighter springs, less load on hardware and openers. Individually they last longer and the failures are less dramatic.
- Better sealing on an uneven slab. This one matters in North Texas. A sixteen-foot bottom edge has to conform to sixteen feet of concrete, and clay soil movement means it often will not. Two eight-foot doors each conform to a shorter run and each seal independently.
- Cheaper individual repairs. A damaged section on an eight-foot door is a smaller part than a sixteen-foot one, and considerably easier for one person to handle.
- Appearance, if you want it. Two carriage-style doors with a post between them is a look many people prefer, and it breaks up a very large flat elevation.
The thing that decides it, which is structural
Two singles need a post between them, and that post has to carry load.
In a garage originally built with one wide opening, the header above spans the full width and is sized for it. Adding a centre post is usually straightforward, because you are adding support rather than removing it, though it still has to bear properly onto the slab and tie into the header.
Going the other way, from two openings to one, is a different matter entirely. Removing a post means the header now spans twice as far, and that is a structural change requiring a properly sized beam and, in most jurisdictions in this metro, a permit and an inspection. This is not a garage door job with a door quote attached.
So the two directions are not symmetrical. Splitting one into two is a moderate project. Combining two into one is a construction project.
What the wide door needs that people skip
If you keep the single wide door, the items worth insisting on:
- Struts on every section that the manufacturer specifies, not just the top one. Under-strutted wide doors sag in the middle over years, and a sagging section binds in the tracks.
- Correctly sized springs and drums for the actual weight, calculated rather than carried over from the old door. If the new door is insulated and the old one was not, the weight has changed substantially.
- Heavier gauge hardware, particularly the hinges and the end stiles.
- Two springs rather than one where the weight calls for it, which on most wide insulated doors it does.
These are the lines that get trimmed to win a quote, and they are the ones that determine whether the door is still running properly in eight years.
The money question
No prices, but the comparison is not as simple as one door versus two.
Up front, one wide door and one opener is generally the lower number. Two doors, two openers and a post is more, and the post is real work.
Over time it moves. Two lighter doors are in a lighter duty class throughout, so springs and hardware last longer, individual repairs are smaller, and a failure takes out half your garage rather than all of it. Whether that closes the gap depends entirely on how long you intend to be in the house.
What not to buy
- Do not buy a wide door without the manufacturer’s strutting. It is the single most common corner cut on double doors and it shows up as a sagging middle section years later.
- Do not buy the removal of a centre post as part of a door quote. That is a header question and it needs a permit and someone qualified to size the beam.
- Do not buy a heavier insulated double on the existing springs. The weight changed and the arithmetic has to be redone.
- Do not buy two singles and one opener. They exist as an idea and they are a poor one; each door needs its own.
The short version
One wide door is simpler and cheaper up front. Two singles are lighter on every component, seal better on a slab that moves, and mean a broken spring costs you half a garage instead of all of it.
Either is a defensible choice. What is not defensible is a wide door quoted without struts and without recalculated springs, and that is the version we most often get called back to.
Garage Doors Pro Service · (469) 693-9000 · garagedoorsproservice.com
Serving Dallas, Plano, Frisco, McKinney and the DFW metro.
