Calculator / Decision example

Overlap coverage and pin spacing are different decisions

Written for this calculation decision · reviewed October 12, 2026 · TwoCut.

Coverage comes from effective strip width

Consider a 20 × 8 ft rectangle with 3 × 50 ft rolls and 6 in seam overlap. Three lengthwise strips span 9 − 1 = 8 ft after their two half-foot overlaps, exactly covering the bed width. They consume 60 linear feet of 3 ft fabric; whole-roll packing needs two 50 ft rolls because each 20 ft strip must remain continuous.

Fixings respond to the spacing assumption

Under this calculator’s separate perimeter and seam endpoint counting, 24 in spacing gives 50 pins, while 12 in gives 98. The rolls remain two: pin spacing does not change the strip coverage calculation. Plant openings and extra anchors across the field are excluded, so neither value is a complete universal installation order.

Choose instructions before choosing the pin count

Eaton Brothers installation instructions describe overlap and tighter edge anchoring, with additional field pins. The calculator’s editable spacing is a planning input; it is not a claim that 24 in suits every product, soil or exposure. Check your selected material’s instructions and add omitted anchors.

Alternative roll layout and uncertainty

A wider roll can remove seams but may leave larger trimming waste. Compare required coverage, full-width cuts and unused roll area together. This conservative strip model does not reuse every scrap, and the rectangular footprint does not identify plant locations. Measure the overlap in the same unit as the roll width: 6 in is 0.5 ft, not 6 ft.

Compare the common-dimension presets or change the inputs.