Snow load explained

Half the manufacturers in this category publish snow capacity in a unit that cannot be compared to the other half's. Here is how to put them on the same footing.

By Ryder M. · Published September 26, 2026 · Last updated September 26, 2026

We compare published manufacturer specifications, warranty terms and owner-reported failure modes. We have not physically tested these structures. How we judge shade structures

Part of Wind, Snow & Anchoring

Snow accumulated on a pitched roof beside a winter garden

The short answer

You need your region's ground snow load, which is set locally and varies enormously across the US. Compare it against a per-square-foot figure — and convert any whole-roof weight figure first by dividing it by the roof area. Converted figures we can source run from 9 lb/ft² on a steel-framed carport to roughly 56 lb/ft² on a cedar gazebo with 6x6 posts.

The unit problem, and it is a real one

This is the single most confusing thing in backyard shade specifications, and it catches careful buyers.

Some manufacturers publish snow capacity as a load per square foot — Domi states 15 lb/ft² for its louvered pergolas, Quictent states 9 lb/ft² for its 10 x 20 carport, Outsunny states a 10 lb/ft² roof weight capacity. This is the form building codes and engineers use, and it is comparable across products of different sizes.

Others publish a total weight across the whole roof — Sunjoy states 3,000 lb for its 12 x 14 Kingston and 3,400 lb for its 13 x 15, and PURPLE LEAF states 2,500 lb without naming a roof area at all. These are not specifications you can compare to anything until you do the division yourself.

And the division changes the story. Sunjoy's 3,000 lb across a 12 x 14 ft roof is 168 ft², so roughly 18 lb/ft² — a genuinely strong figure, and stronger than it sounds next to Domi's 15. But the same 3,000 lb on a 12 x 20 roof would be 240 ft² and roughly 12.5 lb/ft². The headline number stays the same while the actual capacity drops by a third. When a manufacturer publishes a total without a roof area, as PURPLE LEAF does, the figure cannot be converted at all.

The division also shows how wide the real spread is. Backyard Discovery's 6,700 lb across a 12 x 10 ft Norwood roof converts to roughly 56 lb/ft² — more than three times Sunjoy's figure, on a structure whose posts are 6 in. x 6 in. cedar rather than aluminum tube. Snow load is resisted by post section, beam depth and connection stiffness, which is exactly where that difference comes from.

Converting a whole-roof figure yourself

It is one division, and it is worth doing before you compare two products.

01Find the published total weight capacity and the roof dimensions. Use the roof dimensions, not the base dimensions — they differ, sometimes by more than a foot in each direction.
02Multiply the roof dimensions to get the area in square feet. A 12 x 14 ft roof is 168 ft².
03Divide the total capacity by the area. 3,000 lb ÷ 168 ft² = 17.9 lb/ft².
04Compare that against the other product's per-square-foot figure, and against your region's ground snow load.
05If the manufacturer publishes a total with no roof area, stop. The figure is not usable and should be treated as not published — which is how our tables record it.

Finding the figure you actually need

Ground snow load is the design figure for your location, and it varies more across the US than any other number in this decision — from single digits across much of the south to figures many times higher in mountain and lake-effect regions. It is not a national constant and we are not going to print a map of it, because the authoritative figure is the one your jurisdiction adopts.

Ask your local building department. They hold the adopted ground snow load for your address, and for a structure that needs a permit they will be the ones applying it anyway. That call takes five minutes and is the only way to get a figure you can rely on. Requirements vary by jurisdiction — check locally rather than working from a general guide.

Then hold two things in mind when you compare it against a product figure. Roof snow load is not the same as ground snow load — pitch, exposure and thermal conditions all change what actually sits on a roof, and codes apply factors to get from one to the other. And wet snow weighs far more than dry, so a late-season storm can load a roof several times harder than the same depth of powder. A published capacity is a ceiling in ideal conditions, not a running allowance.

Every published snow figure we can source

Published snow figures, with whole-roof totals converted to a per-square-foot equivalent where the manufacturer states a roof area.
Structure	As published	Per ft² equivalent	Comparable?
Backyard Discovery Norwood 12 x 10	6,700 lb across the roof, or up to 30 in. of snow	Roughly 56 lb/ft² over a 120 ft² roof	Yes, after converting — and it publishes a depth too
Domi louvered pergola	15 lb/ft²	15 lb/ft²	Yes — published in the useful unit
Sunjoy Kingston 12 x 14	3,000 lb across the entire roof	Roughly 17.9 lb/ft² over a 168 ft² roof	Yes, after converting
Sunjoy 13 x 15	3,400 lb across the entire roof	Roughly 17.4 lb/ft² over a 195 ft² roof	Yes, after converting
Outsunny polycarbonate pergola	10 lb/ft² roof weight capacity	10 lb/ft²	Yes — published in the useful unit
Quictent 10 x 20 carport	9 lb/ft²	9 lb/ft²	Yes — published in the useful unit
PURPLE LEAF hardtop gazebo	2,500 lb	Cannot be calculated — no roof area stated, and the range spans 6 x 8 ft to 14 x 28 ft	No
Sojag Messina / Verona	Not published by manufacturer	Not published by manufacturer	No — described as carrying an engineered snow load, no figure printed
Yardistry Meridian	Not published by manufacturer	Not published by manufacturer	No
All shade sails we track	Not published by manufacturer	Not published by manufacturer	No — and a sail should not be left up in snow regardless

Published snow figures, with whole-roof totals converted to a per-square-foot equivalent where the manufacturer states a roof area.

Note what the PURPLE LEAF row demonstrates. A 2,500 lb figure attached to a size range running from 6 x 8 ft to 14 x 28 ft describes capacities anywhere from roughly 52 lb/ft² to under 7, depending on which gazebo you bought. That is not a specification; it is a number.

Clear the roof anyway — the manufacturers say so

This is the part that surprises people who have just paid for a four-season roof. The manufacturers with the best snow credentials are the ones telling you to clear it. Sojag's own guidance on the Messina is that any accumulation should always be removed, on a roof it describes as engineered for four-season use.

That is not a contradiction. A published capacity is a survival ceiling for a single loading event on a correctly assembled structure. It is not a license to let snow sit, and it says nothing about what happens over a season of freeze-thaw cycles where a compacted ice layer forms under fresh snow and the effective load climbs well past what any depth measurement suggests.

Two structural details make clearing more important than the headline figure implies. Polycarbonate panels creep: under repeated loading they deflect, recover, and recover slightly less each winter, and that slow loss is not covered by most warranties. Snow does not load evenly, so drifting against a wall or a fence can concentrate several times the average depth on one side of a roof designed for a uniform load.

Clearing a roof without damaging it

The most common way these roofs get wrecked is during snow removal rather than during the storm.

Work from the ground with a roof rake. Do not climb onto a gazebo roof — none of these structures is rated for a person's weight as a point load, and the panels least of all.
Push, don't chop. A shovel edge or an ice chipper will scratch a powder coat and crack a polycarbonate panel. Scratched powder coat is where corrosion starts.
Leave a thin layer. Trying to scrape to bare panel is what causes damage. The goal is removing the load, not cleaning the roof.
Clear evenly across the roof. Taking all the snow off one side and none off the other replaces a uniform load with an unbalanced one, which is harder on the frame.
Do it before the thaw. Snow that has gone through a melt-freeze cycle is heavier, bonded to the panel and far harder to remove without damage. The easy time to clear a roof is while the snow is still loose.
Take fabric down before winter entirely. Sails, pop-ups and extended awnings have no snow rating and no realistic way to shed a load. This is not a compromise — it is the design intent of a retractable product.

What to buy if you are in snow country

Ranked by how much difference it actually makes.

A per-square-foot figure you can check against your local ground snow load. A product that publishes in the useful unit has told you something; one that publishes a total without a roof area has not.
Steel over polycarbonate. Steel panels shed and dent; polycarbonate passes light and creeps. In snow country the trade favors steel every time — see polycarbonate vs steel gazebo roofs.
Pitch. A steeper roof sheds rather than accumulates, and pitch does more for real-world snow performance than a few pounds per square foot of rated capacity.
An open roof, where it suits you. A slatted cedar or louvered pergola roof does not accumulate snow in the way a solid one does. It also gives you no rain cover, which is the trade.
Anchoring, still. Snow and wind arrive together, and a loaded roof in wind is a worse case than either alone. How to anchor a gazebo covers the fixings.

The category-specific detail lives in best gazebos for snow load and gazebo snow load explained, and the lifespan consequences of repeated loading are in how long shade structures last.

Questions people ask

What snow load do I need for a gazebo?

You need your jurisdiction's adopted ground snow load, which your local building department holds for your address. It varies enormously across the US and is not something a general guide can give you. Once you have it, compare it against a per-square-foot published figure — converting any whole-roof total first.

Why do manufacturers publish snow load in pounds rather than pounds per square foot?

A large total weight reads as a stronger claim than the same capacity expressed per square foot. 3,000 lb sounds more impressive than 17.9 lb/ft², and it is the same figure. Divide the total by the roof area to get something you can actually compare, and treat a total published without a roof area as unusable.

Do I need to remove snow from a hardtop gazebo?

Yes. Sojag's own guidance is that accumulation should always be removed even from a roof it describes as engineered for four seasons. A published capacity is a survival ceiling for one loading event, not permission to leave the roof loaded through a winter of freeze-thaw cycles.

How do I get snow off a gazebo roof safely?

From the ground, with a roof rake, pushing rather than chopping, leaving a thin layer behind, and clearing evenly across the roof rather than stripping one side. Never climb onto the roof — none of these structures is rated for a person's weight as a point load.

Can a pergola handle snow?

An open slatted or louvered roof does not accumulate snow the way a solid one does, which is a real advantage — but louvered pergolas in the closed position do accumulate, and only some publish a figure. Domi publishes 15 lb/ft² and Outsunny publishes a 10 lb/ft² roof capacity; PURPLE LEAF publishes no snow figure for its louvered pergolas at all. Open the louvers before a storm.

Can I leave a shade sail or canopy up over winter?

No. No shade sail manufacturer we track publishes a snow figure, fabric pools and stretches under wet snow, and the corner fixings carry the entire load. Take sails, pop-ups and extended awnings down before the first snow.

Does wet snow really weigh that much more?

Considerably more for the same depth, which is why depth is an unreliable guide to load. A late-season wet snowfall can put several times the weight on a roof that a dry powder fall of the same depth would. It is the main reason to clear early rather than measure.

Does a polycarbonate roof handle snow as well as steel?

Not over time. Polycarbonate panels deflect under load, recover, and recover slightly less with each winter — a slow creep that most warranties do not cover. Steel dents but does not creep. In snow country, steel is the better bet.

Where these figures came from

Found an error? Tell us and we will correct it within seven days and note the change on the page with a dated line — see our editorial policy.