How Much Polymeric Sand Do I Need?

For purchasing, divide paved area by the coverage published for the selected polymeric product and joint conditions, apply any chosen allowance once, and round up to whole bags. PaverPlan also offers a geometry method for planning comparisons. The two methods answer related questions but are not interchangeable guarantees.

Method A: product coverage for purchasing

Raw bags = project sq ft ÷ product sq ft per bag
Whole bags = round up [raw bags × (1 + selected allowance)]

Match the coverage table to product, color where relevant, joint width, fill depth and paver dimensions. The Gator Maxx G2 product page is one example of a manufacturer giving different coverage for different joints. Its figures must not become defaults for another product.

Illustrative inputs only: if your selected product and layout have verified coverage of 75 sq ft per bag, a 300 sq ft project requires 4 bags at zero allowance. If you choose 5%, the unrounded requirement becomes 4.2, giving 5 whole bags. Whole-bag rounding already provides additional material; do not apply the allowance again to the rounded count.

If a table supplies a range, estimate both endpoints or ask the manufacturer which entry fits your layout. For area A and coverage from C-low to C-high, raw bags range from A/C-high to A/C-low. Do not treat the largest coverage value as a guaranteed yield.

Method B: repeating rectangular joint geometry

For actual face dimensions L and W, a uniform joint J, and fill depth D, all in inches:

Joint fraction = 1 − [L × W ÷ ((L + J) × (W + J))]
Joint cubic feet = paved sq ft × joint fraction × D ÷ 12

The repeating module allocates shared joints once. Multiplying every paver perimeter by joint width without sharing boundaries can double count them.

Geometry example: an 8 × 4-inch face, ⅛-inch joint and 2-inch fill depth over 300 sq ft produce a joint fraction of about 4.522%, or approximately 2.261 cu ft of rectangular joint void. These are illustrative dimensions, not a product’s required joint depth.

The dedicated calculator can convert geometry to estimated weight with supplied bulk density, and to a planning bag estimate with actual package weight. Without those inputs, volume is still available. Patio Cost keeps polymeric purchasing bags tied to manufacturer coverage.

Know what geometry leaves out

Chamfers, rounded edges, false joints, variable gaps, borders and irregular units can differ from a uniform rectangular model. Fill depth is the specified jointing depth, not automatically the paver’s full thickness. A binder product’s installed yield can also differ from a simple loose-density calculation.

Use geometry to compare how joint width changes demand or to check whether an order estimate is plausible. Use matching product coverage and instructions to make the purchasing decision.

Collect these inputs before ordering

Record the exact product, package, applicable coverage entry, intended joint dimensions and selected allowance. If the product does not approve the joint or pavement assembly, a quantity result does not resolve that mismatch.

Use Manufacturer Coverage mode in the Polymeric Sand Calculator for the purchase estimate. Use Joint Geometry mode to compare layouts while keeping its assumptions visible.