Read waterproofing coverage as a complete system

A waterproofing quantity estimate must follow a selected system. Primer, membrane coats, reinforcement and junction details may each have their own rate. Confirm the system first, then calculate the amount needed for its defined scope.

Identify the coverage basis

If an illustrative complete-system consumption were 1.5 L/m² across all required coats, 12 m² would require 18 L before allowance. Do not multiply by the coat count again. If the rate instead applies per coat, the calculation must include the specified number of coats. Keep the rate wording in your estimate.

Include specified upturns and returns

A floor area alone can omit wall upturns, penetrations and other treated surfaces. For example, a 10 m perimeter with a hypothetical 0.15 m treated upturn adds 1.5 m². The height here is only a quantity example and does not establish a required waterproofing detail.

Keep primer and accessories separate

A primer may use a different coverage rate and substrate basis. Reinforcement fabric, bond breakers and other specified accessories cannot be inferred from membrane litres alone. List unresolved items rather than assuming they are included in the coating result.

Verify before work

Application thickness, drying, compatibility, testing and compliance depend on the selected system and project requirements. The calculator is a quantity aid, not a waterproofing design or assurance of a watertight installation. Use current manufacturer instructions and the applicable project specification.

Found a measurement or calculation issue? Send the example and your correction.