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Buying the wrong size pipe insulation is one of the most common mistakes made by both DIY homeowners and experienced contractors. This guide explains exactly how to measure your pipes and choose the correct insulation size.
The two measurements you need
Pipe insulation is sized by two dimensions: the bore size (the internal diameter of the insulation, which matches the outside diameter of your pipe) and the wall thickness (how thick the insulation is around the pipe).
Step 1 — Measure your pipe's outside diameter
Use a tape measure or vernier caliper to measure the outside diameter (OD) of your pipe. Do not measure the inside of the pipe. Common UK copper pipe outside diameters are 15mm, 22mm, 28mm, 35mm, 42mm, 54mm, 76mm, and 108mm.
Step 2 — Match to insulation bore size
The bore size of your insulation should match the outside diameter of your pipe. For example, a 22mm copper pipe requires 22mm bore insulation.
Step 3 — Choose wall thickness
Wall thickness depends on your application — see our individual size guides for 15mm pipe insulation, 22mm pipe insulation, and 28mm pipe insulation.
Browse by pipe size
Use our pipe insulation by pipe size collection to find the right product instantly, or explore our full pipe insulation range. Call 0161 775 1190 if you're unsure.
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