Continuous seam cuts versus permitted tape pooling: quantity checks.
Total metres alone can undercount rolls when individual continuous pieces cannot share the remaining length.
Use the matching calculator
Use this decision sequence
- Write down the common measured requirement before changing an assumption.
- Record the selected tape length, sheet dimensions, permitted splice overlap and liquid product coverage. Obtain all details from your supplied specification.
- Calculate each permitted scenario independently; do not add alternative orders together.
- Carry the chosen product quantities into your material project and use actual supplier prices.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| First basis | Continuous seam cuts |
| Second basis | permitted tape pooling |
| Decision boundary | Seam tape and flashing tape are not automatically interchangeable. The calculator does not approve waterproofing or flashing details. |
Worked comparison
Two continuous 6 m seams require two 10 m rolls. Adding two 0.5 m junction patches still fits those two rolls. The unused length is real stock, but a third continuous 6 m seam cannot be made from the two 3.5 m remnants without a permitted joint.
Check before using the estimate
Seam tape and flashing tape are not automatically interchangeable. The calculator does not approve waterproofing or flashing details.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Sources and product references
References support the stated product-data distinction. All worked examples are independent illustrative arithmetic.
Calculation and scope checked 2026-10-05. Methods and scope.