Strip Curtain Overlap: 25%, 50% or 100%?

Overlap is the setting most people guess at when they order a strip curtain door — and it is the one that decides whether your curtain actually seals or just hangs there looking busy. The good news: the decision comes down to two questions. What goes through the door, and how hard does the door need to seal? Answer those and the right overlap picks itself.

What overlap actually means

Strip curtain strips hang side by side on a mounting hanger. Overlap is how much each strip covers its neighbor. At 25% overlap, a strip covers a quarter of the strip next to it. At 50%, half. At 100% — full overlap — you are effectively hanging two complete layers of strips across the doorway, offset so every seam in the front layer is backed by solid PVC behind it.

More overlap means a tighter seal, better temperature control, and more material on the door. It also means more weight to push through. Less overlap means easier pass-through and a lower price, with a looser seal. That is the whole trade — everything below is just knowing where your door sits on it.

25% overlap: high-traffic pedestrian doors

At 25%, strips barely lap each other. The curtain parts easily and falls back into place fast, which is exactly what you want when people are walking through all day carrying loaded serving trays or boxes. It uses the least material, so it is also the most economical configuration.

Where it works: restaurant kitchens, busy stockroom doorways, walk-in coolers with constant in-and-out traffic where a few degrees of drift will not hurt anything. Where it does not: freezers, doors with pressure differences, or anywhere you are counting on the curtain to hold a temperature line. A 25% curtain is a barrier, not a seal.

50% overlap: the industry standard for a reason

Half overlap is the default answer, and honestly, if you stop reading here and order an 8" strip kit at 50%, you will probably be fine. It is the most versatile setup we make: it withstands pedestrian traffic, accommodates a person walking a hand truck through, and seals well enough for most coolers, warehouses and shop doorways.

It sits right in the middle of the effectiveness-versus-ease-of-access trade, which is why it is the most common configuration in the industry. When customers call unsure, this is where we usually land them.

67% overlap: the in-between worth knowing about

Not in the article title, but it is on our Overlap Guide for a reason. Two places 67% earns its keep:

• 6" strips at 67% — smaller doorways with pedestrian-only traffic. A light-duty, economical solution for small walk-in coolers.
• 12" strips at 67% — the heavy-duty pick for big openings with forklift, truck or machine traffic. You get serious coverage from the wide strip without going to full overlap, which keeps the door easier to drive through. One caution from experience: if your forklifts typically carry light loads, a curtain that is too heavy can drag product right off the forks. 67% on a 12" strip keeps the weight manageable.

100% overlap: when the seal is the whole point

Full overlap doubles the curtain — two complete layers of strips across the doorway. Every gap in the front layer is covered by the back layer, so air has no straight path through. This is the configuration for:

• Walk-in freezers. 6" strips at 100% overlap is the walk-in freezer industry standard — the smallest strip in full overlap gives the tightest practical seal while staying light enough to walk through. It is the setup on our Walk-In Cooler & Freezer Kit, paired with polar-grade PVC that stays flexible at freezer temperatures.
• Pressure and draft problems. Negative or positive air pressure between spaces, wind at exterior doors, or the office-to-warehouse opening where you need to shut down noise and dust. 8" at 100% handles larger openings where bigger, heavier strips would be overkill.
• Energy savings. If the reason you are buying a curtain is the utility bill, full overlap is what turns a strip curtain from a visual divider into an insulator.

The 30-second decision

• Freezer? 6" strips, 100% overlap. Done.
• Sealing air pressure, drafts, noise or dust? 8" strips, 100% overlap.
• Forklifts or machinery through a big opening? 12" strips, 67% overlap.
• Everyday cooler, warehouse or shop door? 8" strips, 50% overlap — the industry standard.
• Busy pedestrian door where easy pass-through matters most? 8" strips, 25% overlap.
• Small doorway, people only, budget-minded? 6" strips, 67% overlap.

Mistakes we see weekly

Buying 100% overlap for a busy pedestrian door. The seal is great; the experience is not. Staff pushing through a double-layer curtain forty times a shift will start propping it open, and a propped-open curtain seals exactly nothing. Match the overlap to the traffic, not just the temperature.

Buying 25% for a freezer. The gaps that make it easy to walk through also let cold air pour out at floor level. You will see the frost pattern on the floor and wonder why the compressor never shuts off.

Forgetting the overlap changes the strip count. Overlap is a real material difference — a 100% overlap door uses roughly twice the strip of a 25% door of the same width. That is why our kit calculator asks for it up front: the price follows the material, and there are no surprises at checkout.

Frequently asked questions

What overlap do I need for a walk-in cooler?

For most walk-in coolers, 8" strips at 50% overlap is the sweet spot between temperature control and easy access. If traffic is constant and the cooler holds temperature easily, 25% works. If the cooler struggles to hold temperature or sits near a heat source, step up to 100%.

Is 100% overlap harder to walk through?

Yes — you are pushing through two layers of PVC instead of one. It is entirely manageable for normal use, which is why it is the freezer standard, but for high-frequency pedestrian traffic it can feel like a chore. That is the trade you are making for the seal.

Can I change the overlap later?

Yes. Strips mount individually on the universal hanger, so you can add strips to increase overlap or remove them to open the door up. If you are between two options, it is easier to add strips later than to have leftovers — call us at (888) 970-5888 and we will help you figure the count.

Does overlap affect the price?

Directly. More overlap means more strips for the same doorway, and material is most of the cost of a kit. Our calculator prices your exact door size and overlap combination instantly, so you can compare a 50% and 100% build in about ten seconds.

Still on the fence between materials while you are at it? Request a free sample pack and feel the strip grades side by side before you order. And if you would rather just talk it through, call (888) 970-5888 — sizing strip doors is what we do all day.