Calculation basis
The current site estimator assumes 15 gallons of concentrate per 1,000 square feet at a 3-inch depth, scaling with depth, plus automatic edge treatment across an 18-inch perimeter strip.
One path or multiple areas
Supply length and width for each path. A project can combine quantities for shipping or package separate construction areas independently.
Dilution and purchase volumes
The estimator applies five parts water to one part concentrate. Water is mixed at installation and does not count as purchased concentrate.
Containers
Estimates consider 5-gallon pails, 55-gallon drums and 275-gallon IBC totes. Actual availability and freight arrangements are confirmed by quotation.
Formula walkthrough
The main area is length × width. Multiply square feet by 0.015 gallons per square foot at three inches and by depth divided by three. The perimeter component uses 2 × (length + width) × 1.5 feet × 0.015 gallons per square foot. Sum exact volumes before rounding the combined project order.
Avoid double-counting
The estimator's edge allowance treats every rectangle as separately exposed. When adjoining sections share edges or intersect, the automatic perimeter allowance can count some treated strips twice. Review the geometry manually for large intersections or irregular shapes.
Container tradeoffs
Twenty gallons of concentrate can fit in four five-gallon pails. Two 55-gallon drums might be appropriate for another project where handling and delivery dominate, but would leave significant unused capacity for this example. A recommended container plan is a logistics estimate and must be checked against supplier availability.
Split project takeoffs
For a project with a 100-by-10-foot entrance path and a separate 60-by-6-foot side path, model two rectangles independently. If the work is performed on separate dates or sites, review packaging by area; a combined total may be more convenient for a single crew but less useful if material must be transferred between locations. Double-check whether borders and intersections overlap the perimeter allowance.
What to send with a quote
Material quantities alone cannot determine landed cost or delivery feasibility. Provide the site address, access restrictions, available equipment, required installation date, product handling preference and relevant phase schedule. Include any unusual grade, aggregate or cold-weather conditions so PolyFirm can review them before a purchasing commitment.
Field review before final selection
Review shared borders and non-rectangular areas separately; the automated edge allowance intentionally simplifies path geometry.