Aluminum vs wood pergola

The best-documented aluminum pergola in the category, and the right answer for anyone whose honest maintenance plan is washing it occasionally.

72 mph wind and 15 lb/ft² snow, both published — the only pergola we track with figures for both loading directions. Five years on the hardtop roof and frame, one year on curtains and netting, which is five times the structural term of the category norm and the correct shape besides.

The aluminum proposition in full: it does not rust, it needs washing and a seasonal fastener check, and that is the list. No sealing, no checking, no rot, no annual decision about whether this is the year you get round to it.

What it does instead is degrade cosmetically and irreversibly. Powder coat chalks and goes patchy on the sunward face, and nothing restores it. You are trading repairability for freedom from obligation, and for a lot of people that is the correct trade.

Adjustable louvers, aluminum frame, 10 x 10 through 12 x 20 ft, M6 expansion bolts into deck or concrete immediately after assembly.

If the aluminum argument is about engineering rather than convenience, this is the one that publishes enough to have the argument with.

Powder-coated aluminum, 1.5 mm wall, 4.33 in. x 4.33 in. crossbeams — the only published wall thickness in the category. Wall thickness is what resists twisting under load, and it is exactly the specification that separates a serious extrusion from a light tube. Both get sold as "heavy duty aluminum".

72 mph, fully secured with expansion screws on a hardened floor. The stated condition is as useful as the figure.

Integrated drainage in the beams is a durability feature on an aluminum structure as well as a comfort one: water channeled through the frame and down the posts does not sit on coated surfaces, and standing water on a coating is where degradation starts.

One-year warranty and no snow figure, which is where it loses to the Domi on a durability comparison.

The wood option with real published figures, which is rare: 100 mph Pro-Tect tested — the highest in backyard shade — on 100% cedar with 5.5 in. x 5.5 in. posts, dual structural cross beams and corbels, with anchoring made mandatory by the manufacturer.

That wind figure is the part of the wood case people underrate. Post section resists the racking that pulls post-and-beam frames apart, and a 5.5-inch cedar post is a substantially different structural member from a 4.33-inch aluminum crossbeam with a 1.5 mm wall. Heavy timber is genuinely stronger here, not just heavier.

And the repairability is the real argument. When an aluminum frame's coating chalks, there is no remedy. When a cedar beam checks at a through-bolt, you replace one board with lumber from any yard. On a twenty-year horizon that is the difference between maintainable and merely standing.

Five-year warranty. Re-seal every two to three years, with attention to end grain and through-bolts — and that condition is not negotiable. Sizes 10 x 10 through 20 x 12 ft.

6 in. x 6 in. posts with classic plinths — the largest post section in this comparison, and the plinths matter more than they look.

A plinth lifts the post base off the surface, and end grain sitting in standing water is the single most predictable failure point on any timber structure: water wicks up end grain far faster than it penetrates a face, and rot starts there. A detail that keeps the base out of the puddle is doing more for the structure's life than most published specifications — and it is exactly the kind of thing aluminum never has to think about.

Five years limited on lumber against rot and decay, one year on materials and workmanship. Confidence placed precisely where cedar's risk lies.

It also publishes a 12 x 12 ft roof at 8 ft 6 in. high over a 10 x 10 ft base, outside-to-outside of posts — over a foot lost each way, and almost nobody else in backyard shade publishes both.

No wind rating, no snow figure, and the product page does not name the species — so we cite the post dimensions and construction rather than claiming a material the page does not state.

Worth knowing exists, and worth being clear about what it is: PURPLE LEAF offers its Caesar line in a wood-grain finish on a powder-coated aluminum frame.

It answers the aesthetic objection to aluminum without answering the structural one. You get the appearance of timber with aluminum's maintenance profile — no sealing, no checking, no rot — and you do not get cedar's repairability. A wood-grain powder coat is still a powder coat: it chalks on the sunward face and cannot be restored.

70 mph under normal installation, powder-coated aluminum, adjustable louvers, 9 x 12 through 14 x 24 ft plus wall-mounted and slanted-roof variants. One-year warranty, no snow figure, no published wall thickness for this line.

We have not handled one and we are not going to tell you how convincing the finish looks — that is exactly the kind of claim this site does not make without evidence. What we can tell you is that structurally it is an aluminum pergola.