HTHOMETALLYTHE PRACTICAL HOME GUIDE

Construction/ CALCULATOR

Sheet wrap for one straight cylindrical section

Find flat strip width and sheet area around an actual finished outside diameter, including one longitudinal overlap.

For insulation jackets, measure the outside of the finished insulation, not the pipe bore or nominal pipe size.
No bends, fittings or end caps. Several unequal sections need separate calculations.
One seam along the length. Use the chosen wrap system’s detail; zero is a no-overlap comparison.
Circumference at the wrapping surface

194.78 mm

Flat strip width including seam overlap

214.78 mm

Net cylindrical surface area

1.948 m²

Sheet area with longitudinal overlap

2.148 m²

Interpretation:This includes one longitudinal overlap only. Add verified details for ends, bends, stock cuts and other seams separately.

Ideal straight cylinder and one full-length seam. Diameter is measured at the actual wrapping surface. No allowance for sheet-stock cutting layout, transverse seams, bends, fittings, end caps, fastening, thickness springback or waste. This area does not specify insulation thickness, fire suitability, weatherproofing or vapour-seal performance. Verify the wrap system and available sheet dimensions before ordering; do not substitute this for a complete insulation detail.

FROM ESTIMATE TO ACTION

Use the result, not just the number.

01

Verify the inputs

Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.

02

Keep the calculation traceable

Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.

03

Confirm the decision

Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.

Inputs to verify

Actual diameter at the wrapping surface (mm)
For insulation jackets, measure the outside of the finished insulation, not the pipe bore or nominal pipe size.
Straight section length (m)
No bends, fittings or end caps. Several unequal sections need separate calculations.
Longitudinal seam overlap (mm)
One seam along the length. Use the chosen wrap system’s detail; zero is a no-overlap comparison.

Continue your calculation

Frost & ground

Heat-trace energy use

Estimate connected load and energy use for a thermostatically controlled heating cable.