Screen Spline - What Spline Size Should I Use?

A common question asked is: What Spline Size Should I Use?

The answer is not always simple. The insect screen is NOT the determining factor, but just one part of the formula. The primary factor is the size of the screen frame channel opening. Once that is determined, the screen material helps guide the final decision.

Typically, you want spline that is .015 - .020" larger than the opening for a snug fit. YES! You want it larger so it stays put and doesn’t blow out during wind or light pressure. For thicker materials like Pet Screen or SunTex, .005 - .010" larger is recommended.

As an example: 4 sheets of copy paper = .010". So, the difference between a .175 and .185 spline is roughly 4 sheets of paper. It's better to err slightly larger and stretch spline slightly for a snug fit.

If reusing the same frame, remove the old spline and measure it. If you're using the same type of screen, match the old spline. Use calipers or a micrometer—available for under $20—to measure accurately. Tape measures or rulers are not accurate enough for .005"–.020".

Flat Spline is used in some products and is easier to size. Common size is 5/16 (.315"). Flat spline doesn't work well with thicker materials. Pool enclosures and systems like Fast Track typically use fiberglass or Tuff Screen materials like 18x14, 20x20, Tuff Screen, and Tuff Screen No-See-Um.

Round Spline is most common in the USA. Measure the current spline or the frame channel. We offer spline sizes from .100 to .250 and a spline sizing chart for assistance.

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