Sod Roll Count
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It divides your total lawn area by the coverage of a single roll, typically about 9-10 square feet per roll for standard sod, then adds a waste factor of about 5% to account for trimming at edges and around obstacles like trees or beds.

Irregular lawn shapes, curves, and obstacles like tree rings or walkways all require cutting rolls to fit, and those cut pieces are rarely reusable elsewhere, so a small buffer prevents running short on the final few rows of an installation.

Yes, while 9-10 square feet is common, some suppliers cut rolls to different dimensions, so it's worth confirming the exact square footage per roll with your specific supplier before finalizing an order, especially for large lawns where a size mismatch compounds into a meaningful difference.

Sod should be installed within 24 hours of delivery, ideally the same day, since rolled sod generates heat and can yellow or die if left stacked on a pallet for more than a day, especially in warm weather.

It's not usually practical since sod doesn't store well, but keeping a small unused section aside for a few days to patch installation mistakes is reasonable; for future repairs months later, matching grass species and buying fresh sod at that time works better than trying to store extra.