The scrim count on a winter pool cover refers to the number of reinforcing threads woven into one square inch of the cover’s material. The higher the scrim count, the tighter the weave, which leads to a stronger, more durable winter cover.
What is Scrim?
Scrim is the woven polyester or polyethylene grid sandwiched between the cover’s top and bottom layers. It acts like a “skeleton” inside the cover, helping it resist tearing, stretching, and UV damage over time.
What does the Scrim Count Look Like?
Scrim count is usually expressed as something like 8 x 8, 10 x 10, or 12 x 12, meaning the number of threads running horizontally and vertically in one square inch.
As an example, see Pureline’s Winter Cover comparison chart, which shows the scrim, denier strength, and warranty lengths of the respective cover.. As the scrim count increases, so does the winter cover’s tensile strength and its warranty (durability.)
So, Why Scrim Count Matters…
Higher scrim count = tighter weave, which reduces water seepage and improves strength.
Lower scrim count = looser weave, which is cheaper but less durable.
It’s one of the key specs (along with weight in ounces per square yard) that determines cover quality and warranty.
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