From this site

One project, every trade

Each calculator adds its lines to a single estimate — consolidated BOM, schedule and cash-flow included.

Open My Project →

Air Barrier Sealant Tape Linear Footage Calculator

Calculate the air barrier seam tape needed to seal sheathing joints and penetrations, with waste allowance.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
197 ft
Schematic, drawn to the proportions you entered — not to scale on screen.
Who is doing the work?

Waste is set to 5% by hand. Pick a tier above to replace it, or keep your own figure.

Seam tape needed

206.69 ft

High confidence

With the figures above, the seam tape needed comes to 63. This is calculated for United States and cites IRC 2024. Building in another market? Change the selector above so the units and code reference follow.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Total seam tape = total seam length × (1 + waste allowance), the standard method for estimating continuous air barrier seam tape

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Which joints actually need taping?
Every joint in the air barrier plane: sheathing panel edges, the perimeter of each rough opening, and every service penetration. Then the transitions that people forget — wall to foundation, wall to roof deck, and around anything that passes through. Those transitions are a small fraction of the tape and a large fraction of the leakage.
Do I need primer?
On OSB, usually yes. On a dusty or cold substrate, usually yes. Acrylic and butyl tapes lose grip on porous or contaminated surfaces, and most manufacturers state a minimum application temperature below which primer becomes mandatory rather than optional. It is a separate cost and a separate operation, and skipping it is why tape lets go in the first winter.
Does taping the sheathing make the building airtight?
It makes one plane airtight. Airtightness is a property of the whole enclosure, and a perfectly taped wall connected badly to the roof leaks at the connection. The only way to know is to test — a blower door finds in an hour what a tape schedule cannot tell you at all.
How much extra should I order?
Enough that nobody is tempted to stretch it. Running short of air barrier tape mid-elevation produces a joint someone decides to leave, and that decision is invisible once the cladding is on. It is a low-cost material guarding a defect that is expensive to find later.