Sunjoy assembly
Sunjoy tell you to stake one product down and bolt the other. Getting it backwards is the whole risk.
One Sunjoy structure is a seasonal shade toy they explicitly say NOT to fix to concrete. The next looks almost identical and is a snow-rated carport that MUST be bolted down. The manual in YOUR box is the one that matters.
Two structures that look alike and want opposite things
Sunjoy have been building outdoor steel structures for over twenty years, and they make a wide range: light fabric-canopy pergolas, heavier steel arched pergolas, hardtop gazebos, and year-round carports. From across the yard several of them look similar. In the ground, they could not be more different.
Their lighter pergolas ship with stakes, and the manual says plainly not to attach them permanently to concrete, and to take them down and store them out of season. Their hardtop carports are the opposite: designed for year-round use, rated for snow load, and meant to be anchored with concrete screws into a slab.
Anchor them the wrong way round and both fail. A stake-it-in-grass canopy bolted rigidly to concrete has nowhere to flex in a gust. A snow-rated carport held down by tent pegs is one storm from becoming a sail. The single most important thing you can do with a Sunjoy is read the manual for YOUR model, not a video of a different one.
What people report
Sunjoy’s own time and crew estimates are, politely, unreliable.
| Model | Time | People |
|---|---|---|
| Steel pergola (10x12)Owners: "took 3 of us 3 hours." A third pair of hands helps at the top. | 3 to 4 hours | 2 to 3 |
| Hardtop gazebo/carportShips in 3 to 4 large boxes. Lots of numbered parts. | 4 to 6 hours | 2 to 3 |
| Sunjoy’s printed estimate (a gazebo)One owner did it largely ALONE in 3 to 4 hours. The estimate is fiction. | "60 to 90 minutes" | "6 to 8 adults" |
| Anchoring to concreteTapcon or expansion screws, bought separately. The holes are permanent. | +1 hour | 1 |
| Handy Assembly / pro installOwners who used it were happy. It is offered at checkout on some retailers. | booked | 2 |
Lay every part out on the lawn, grouped by the letter and then the number stamped on it. Owners who did this found the build far smoother than those who did not.
The five things that actually go wrong
Anchor it the way YOUR manual says, not the way a video shows
The core of this page. Sunjoy’s lighter pergolas are staked into soft ground and explicitly NOT to be bolted to concrete. Their carports are anchored to concrete with Tapcon or expansion screws and are rated for snow. These are opposite instructions from the same company, and the difference is the product, not the preference. Fixing a flexible canopy structure rigidly to a slab, or trusting a snow-rated carport to stakes in a lawn, are both how they fail. Find the manual for your exact model and follow that one.
The manual sometimes names the wrong bolts
Not carelessness on your part, an actual documented problem. Owners of Sunjoy steel structures report discrepancies where the instructions call for the wrong bolts, and where the build guide skips steps and forces rework. The defence is to dry-fit before you drive anything home, to watch the ORIENTATION each part goes in, and to trust the picture of the finished structure over an ambiguous step. Sunjoy include spare hardware, which tells you they know some of it does not go smoothly.
On concrete, the holes are permanent. Measure three times.
Straight from Sunjoy’s own installation guide: you mark the point, drill, and once drilled it cannot be changed, so confirm the position first. There is no second attempt at a hole in a slab. Square the whole structure, check the diagonals, mark all the feet, and only then start drilling. This is the step where a rushed afternoon becomes a permanently crooked carport.
Check every part before you build, because shipping damage is common
A recurring theme in owner reviews: dented panels, creased roof pieces, cracked plastic fittings, sometimes a whole box that has to be returned. Returns can take weeks and hold up the entire build. Open every box on delivery day, check the contents against the list, and photograph any damage immediately, while the structure is still returnable and before you are committed.
The roof panel screws are the weather failure point
A cautionary tale worth heeding. One owner’s metal roof pieces tore off in the first windstorm and had to be replaced with longer fasteners, at over three hundred dollars. On a metal carport, the roof panels are held by screws into the purlins, and if those are too short or under-driven the first real wind finds them. Long-enough fasteners, properly seated into the frame, are what keep the roof on.
Measure the finished HEIGHT, not just the footprint
An owner measured the floor space carefully and still ended up with a structure too tall for the space, because the assembled height exceeded the stated measurement. On a carport, where the whole point is clearing a vehicle and fitting under something, check the real assembled height against your opening and your eaves before you buy.
Before you build
Identify your exact model and download ITS manual. Confirm whether it is a stake-down or bolt-down structure, and buy the concrete anchors separately if it is the latter, because they are not in the box.
Prepare a truly level surface. A carport that must be bolted to concrete needs a sound slab under it.
Check the assembled height against your vehicle and your site.
Open and inspect every box on arrival, and lay the parts out by their stamped letters and numbers.
And line up a third person for the roof, whatever the manual claims about crew size.
Where an installer earns it
By knowing which kind of Sunjoy you have, and anchoring it the way that structure actually needs, which is the difference between one that stays put and one that does not.
By working around a manual that occasionally names the wrong bolt and skips steps, which is exactly the sort of thing that turns a confident DIYer’s afternoon into a weekend of rework.
By drilling the concrete once, in the right place, because there is no second chance at those holes.
And by driving the roof fasteners properly into the frame, which is the specific thing that failed for the owner who lost his roof in the first storm. The structures are good. Almost everything that goes wrong is instructions, anchoring, or a rushed roof, and all three are what an installer removes.
What an installer does
- Identifies whether your model is a stake-down or a bolt-to-concrete structure, and anchors it correctly.
- Supplies the Tapcon or expansion anchors Sunjoy do not include, for concrete or deck installs.
- Dry-fits and watches orientation, working around a manual that can name the wrong bolts.
- Squares the structure and drills the permanent concrete holes once, in the right place.
- Drives the roof panel fasteners fully into the purlins so the first windstorm does not find them.
- Checks the assembled height and clearances, and inspects every part for shipping damage first.
Get it built by someone who has built one before.
Tell us your ZIP and what you bought. Installers near you will quote you directly, and you deal with them, not with us.
Questions people ask
Should I bolt my Sunjoy to concrete or stake it into the ground?
It depends entirely on which Sunjoy you have, and they are not interchangeable. The lighter fabric-canopy pergolas are staked into soft ground, and Sunjoy specifically say NOT to attach them permanently to concrete. The hardtop carports are anchored to a slab with Tapcon or expansion screws and are rated for snow. Follow the manual for your exact model, because doing it the other way round is how each one fails.
The manual seems to call for the wrong bolts. Am I doing something wrong?
Possibly not. Owners of Sunjoy steel structures have reported genuine discrepancies where the instructions name the wrong bolts or skip steps. Dry-fit parts before driving anything home, pay close attention to which way each piece is oriented, and trust the picture of the finished structure. Sunjoy include spare hardware for a reason.
How many people do I really need?
Sunjoy’s printed estimates are unreliable in both directions, one gazebo manual claims sixty to ninety minutes and six to eight adults, and an owner built it largely alone in three to four hours. In practice, two people for most of it and a third for the roof is the realistic answer for a carport or hardtop.
Can I reposition the anchors if I drill in the wrong spot?
No. Sunjoy’s own guide is explicit that once you drill the concrete the position cannot be changed. Square the structure, check the diagonals, mark all the feet, and confirm the layout before a single hole goes into the slab.
Will it survive a storm?
The structures are generally sturdy when anchored correctly, and owners in hurricane areas report success when properly bolted to concrete. The weak point is the roof panels: at least one owner lost metal roof pieces in the first windstorm because the fasteners were too short. Properly seated, long-enough roof screws into the frame are what keep the roof on.
Installers.org is not affiliated with, endorsed by, or sponsored by Sunjoy Group. Sunjoy is a trademark of its owner, referred to here only to describe the assembly services that independent installers on this directory provide.