MetandumFREE TOOLS. NO SUBSCRIPTION.Find a calculator ⌕My projects
All comparisons

Continuous seam cuts versus permitted tape pooling.

Total metres alone can undercount rolls when individual continuous pieces cannot share the remaining length.

Calculate two independent purchase scenarios

Prefilled values are illustrative. Replace measurements and product data on both sides. Quantities with different units or different products cannot be combined. Open a result in its calculator to save it to your material project.

Continuous seams

Membrane Seam and Junction Tape Order Calculator

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Measured item 1
Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Only if joining is permitted

Membrane Seam and Junction Tape Order Calculator

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Measured item 1
Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

A worked purchase 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.

Use your measurements and selected products

Record the selected tape length, sheet dimensions, permitted splice overlap and liquid product coverage. Obtain all details from your supplied specification.

Membrane Seam and Junction Tape Order Calculator

Order rolls from measured seam runs, specified end allowances and separate junction patches, with explicit joining rules.

Waterstop Stock and Splice Quantity Calculator

Count stock lengths and overlapped splices independently for each run in your existing waterstop plan.

Membrane Penetration Patch Blank Calculator

Count square patch blanks that fit a sheet around identical measured penetrations, without reusing cut-out centres.

Liquid Membrane Detail Band Coverage Calculator

Separate measured detail bands from broad surface coverage and remove explicitly measured shared areas once.

What makes the comparison valid?

Seam tape and flashing tape are not automatically interchangeable. The calculator does not approve waterproofing or flashing details.

Illustrative quantities above are not market prices or construction recommendations. Compare actual permitted scenarios independently and keep alternative orders separate.

Next steps

Manufacturer reference for product data

Reviewed 5 October 2026. Search demand has not been measured.