If you’ve been shopping for a commercial marquee, you’ve likely seen the number 550gsm (grams per square meter) approx. On paper, it sounds more robust. But if you look closer at the fine print of some suppliers, like some suppliers, you’ll often see a disclaimer: “within 10% approx.”
In the world of outdoor structures, that “10%” isn’t just a minor rounding error—it’s the difference between a professional-grade cover and a lighter weight substitute.
The “Approximate” Trap: What 10% Really Means
When a supplier says their PVC is 550gsm +/- 10%, they are giving themselves a massive margin for error. In practical terms, a 10% “under-tolerance” means you could be receiving a fabric that could actually be 495gsm.
While 55gsm might not sound like much, it significantly impacts:
- Tensile Strength: Thinner PVC tears more easily under wind stress.
- UV Resistance: Less material means the sun’s rays break down the fabric faster.
DIY Marquees: Setting the Standard for “True Weight”
This is where the distinction between “budget” and “professional” becomes clear. DIY Marquees has built a reputation on transparency, stating the true weight of their materials rather than hiding behind approximations.
DIY Marquees caters to the 500gsm range, while offering high-end professional/deluxe marquees that utilize 650gsm PVC. This isn’t just a random number; it represents a specific grade of material that includes:
- A Thicker Scrim: The inner polyester “mesh” that provides the strength.
- Heavier Coating: More PVC resin on both sides to ensure it remains waterproof.
Comparison: At a Glance
| Feature | The “Approx” 550gsm Cover | The DIY Marquees True Weight |
| Actual Weight | Can be as low as 495gsm | Guaranteed 500/650gsm (Professional Grade) |
| Durability | Suited for occasional domestic use | Built for year-round commercial hire |
| Wind Resistance | Higher risk of eyelet failure | Reinforced stress points & heavier fabric |
| Value | Cheaper upfront, shorter lifespan | Better long-term ROI |
Why True Weight Matters for Your Business
If you are running an event hire business or permanent outdoor venue, the weight of your PVC is your insurance policy. A “true weight” 650gsm marquee feels different the moment you touch it. It’s stiffer, glossier, and hangs with a tension that cheaper fabrics can’t replicate.
By choosing a supplier that specifies exact weights rather than “approximates,” you are ensuring that your investment won’t literally rip apart during the first autumn gale.
The Bottom Line: Don’t let a “10% margin” catch you off guard. When it comes to PVC, you get exactly what you pay for. Always ask for the true weight, not the “approximate” one.