Craft Quantities
Plan & Takeoffs

Materials & Quantities

Insulation, waterproofing & air sealing

The layers that stop heat, air and water crossing the envelope.

  • 35Calculators
  • 33Work in imperial
  • 34Work in metric

What this covers

Batt, board and blown insulation by bag and by area; continuous insulation with its thermal-bridging correction and its fasteners; air barrier tape and fluid-applied membranes; vapour control and its dewpoint check; radiant barriers; sheet and liquid waterproofing with protection board and penetration detailing; waterstops, weeps and cavity drainage.

What decides which one you need

Which layer you are actually estimating, because a wall has three and they fail differently. Insulation is a thermal problem and asks for R-value or U-factor. An air barrier is a leakage problem and asks for area and linear metres of joint. A vapour retarder is a moisture problem and asks where the dewpoint falls in the build-up — a wrong answer there is mould rather than a cold room.

What this does not cover

Roof membranes, which are roofing even where the material is identical, and the cladding or lining that covers the insulation.

Every calculator in this family

35 calculators

Carpet Seam Tape and Sealer Calculator

Take the seam plan's total length and get back rolls of hot-melt tape and tubes of latex edge sealer, with what is left on the last roll.

Imperial / Metric

Crawl Space and Subfloor Vent Calculator

The net vent area a vented crawl space or suspended ground floor needs by the IRC or Approved Document C, and how many vents of a rated size that takes.

Imperial / Metric

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