How to measure and order: membrane seams and details

Use the matching calculator

Membrane Seam and Junction Tape Order Calculator Waterstop Stock and Splice Quantity Calculator Membrane Penetration Patch Blank Calculator Liquid Membrane Detail Band Coverage Calculator

Use this decision sequence

Measure seam runs and detail bands independently from the field area. Count junction patches and penetration blanks once.
Record the selected tape length, sheet dimensions, permitted splice overlap and liquid product coverage. Obtain all details from your supplied specification.
Run each matching calculation and keep different products as separate purchase items.
Check whole packs, stock remnants and delivery rounding before placing an order.

Keep the quantities distinct

Quantity or assumption	How to use it
Measured need	Measure seam runs and detail bands independently from the field area. Count junction patches and penetration blanks once.
Product basis	Record the selected tape length, sheet dimensions, permitted splice overlap and liquid product coverage. Obtain all details from your supplied specification.
Purchase rounding	Whole packs, rolls and stock lengths can exceed the exact material need.

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.