What thickness of pipe insulation?

IECC requires 1 in on most service hot water piping.

Elastomeric or polyethylene?

Elastomeric insulates better and handles higher temperatures.

Cold water pipes too?

Yes, to stop condensation in humid spaces.

What thickness for hot water pipes?

1 in for most service hot water under the IECC.

Should cold pipes be insulated?

Yes where condensation or freezing is a risk.

Vapor barrier or not?

Use a vapor-retarder jacket on chilled or cold pipes.

Pipe insulation calculator

Pipe length, diameter, insulation thickness and fittings: you get insulation lengths to buy, inside and outside diameters and joint tape.

Purchase quantity

71.522 ft

Net measurement: 71.522 ft · Waste 10 %

Pipe insulation lengths12 unit
Insulation inside diameter22 mm Ø
Insulated outside diameter72 mm Ø
Joint tape (15 m roll)1 roll

Use my prices

Your prices per language/currency. Used when you enable “Use my prices” in calculators. My prices →

Calculate labour, margin & GST

How it's calculated (visible formula)

length = pipe run + 0.3 m per fitting; pieces = ceil(length × (1 + waste) ÷ piece length)

Net geometric measurement, no waste.
Adjustable waste % for cuts and breakage.
Purchase rounded up to sellable units (boxes, bags, buckets, boards).

See methodology and formula versions

How to calculate it, step by step

Measure the pipe run to insulate.
Count elbows, tees and valves.
Measure the pipe outside diameter.
Pick insulation thickness for use and location.
Work out pieces with waste and tape.

Worked example: 66 ft of ⅞ in OD (¾ in copper) pipe, 6 fittings, 1 in insulation

20 m + 6 × 0.3 = 21.8 m
+10% = 24 m ÷ 2 m pieces

→ 12 pieces of 6 ft (2 m) and 1 roll of tape.

Common mistakes

Buying a larger ID — loose insulation underperforms.
Not sealing the seam.
Indoor foam outdoors without UV protection.

Pro tips

Insulate the longest hot runs and outdoor pipes first.
Miter-cut elbows for continuous coverage.
Seal longitudinal and butt joints.
Protect outdoor insulation from UV.

From calculation to quote

Add labour, overhead and your margin, and generate the professional PDF.

Create quote Calculate margin & GST

FAQs

What thickness of pipe insulation?: IECC requires 1 in on most service hot water piping.
Elastomeric or polyethylene?: Elastomeric insulates better and handles higher temperatures.
Cold water pipes too?: Yes, to stop condensation in humid spaces.
What thickness for hot water pipes?: 1 in for most service hot water under the IECC.
Should cold pipes be insulated?: Yes where condensation or freezing is a risk.
Vapor barrier or not?: Use a vapor-retarder jacket on chilled or cold pipes.

Sources and standards

Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.