Vapor Barrier calculator.
Plan sheeting strips and rolls using your selected roll dimensions and overlap.
Your inputs
Measurement schematic, not to scale. Use your own dimensions and product specification.
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Rolls are estimated from strip length with allowance. Edge upturns and penetrations are not included; add them to your supplied dimensions.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Length
- 4 m
- Width
- 5 m
- Roll width
- 2 m
- Roll length
- 10 m
- Specified strip overlap
- 200 mm
- Waste allowance
- 10 %
Rolls to purchase: 2 rolls
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-03. Calculation and review policy.