Pour separation sheeting.
Measure the supplied footprint and list the required strip direction and seam allowance.
Read the right quantitative data
Roll width, roll length and already specified overlap dimensions.
Check this ordering assumption
Summing nominal roll area overlooks the repeated width lost at seams.
The arithmetic counts sheeting; it does not select a moisture-control or separation system.
A worked quantity method
This illustrative set of supplied inputs demonstrates Vapor Barrier Calculator. Replace the example measurements and product figures with your own before ordering.
| Supplied input | Metric display | US display |
|---|---|---|
| Length | 4 m | 13.12 ft |
| Width | 5 m | 16.4 ft |
| Roll width | 2 m | 6.56 ft |
| Roll length | 10 m | 32.81 ft |
| Specified strip overlap | 200 mm | 7.87 in |
| Waste allowance | 10 % | 10 % |
Rolls to purchase: 2 rolls
- Sheeting strips
- 3
- Total roll length
- 13.2 m
- Slab area
- 20 m²
Your measurement and product-data sheet
Record what you know and mark verified items ready. Notes save on this browser after you edit them. Download a copy before clearing browser data.
Measure the supplied footprint and list the required strip direction and seam allowance.
Roll width, roll length and already specified overlap dimensions.
Summing nominal roll area overlooks the repeated width lost at seams.
Input for Vapor Barrier Calculator. Record the value with its unit and quantity basis.
Input for Vapor Barrier Calculator. Record the value with its unit and quantity basis.
Input for Vapor Barrier Calculator. Record the value with its unit and quantity basis.
Input for Vapor Barrier Calculator. Record the value with its unit and quantity basis.
Input for Vapor Barrier Calculator. Record the value with its unit and quantity basis.
Input for Vapor Barrier Calculator. Record the value with its unit and quantity basis.
Choose your next calculation
Vapor Barrier Calculator
Plan sheeting strips and rolls using your selected roll dimensions and overlap.
Roof Membrane Roll Lap Calculator
Count membrane courses and rolls for supplied roof-plane dimensions and specified side and end laps.
Turn the estimate into an order
- Confirm that all quantities use the same measured basis and the selected product's current data.
- Keep different products, finishes and handed variants in separate purchase lines.
- Review exact demand and whole-pack purchase quantities before entering your quoted prices.
- Record compatible stock already on hand, then save the remaining order in your browser project.
Measurement and purchase guides
Other materials in this family
Reviewed 6 October 2026. Geometry and purchase arithmetic use your measurements and selected specifications. Calculation scope.