15mm is the most common pipe size in UK domestic plumbing, used for hot and cold water supplies, central heating flow and return pipes, and condensate pipes. Getting the right insulation for 15mm pipes is straightforward once you understand wall thickness and material options.
Why insulate 15mm pipes?
Uninsulated 15mm pipes lose heat rapidly, increasing your energy bills and risking frost damage in exposed locations. Building Regulations Part L requires pipe insulation in most new build and renovation projects, and 15mm pipes in unheated spaces such as lofts, garages, and external walls must be insulated to comply.
Choosing wall thickness for 15mm pipe insulation
The most common wall thicknesses for 15mm pipe insulation are 9mm, 13mm, 19mm, and 25mm. For domestic hot water pipes, 9mm or 13mm is typically sufficient. For pipes in unheated spaces or outdoor locations, 19mm or 25mm wall thickness provides better protection against heat loss and freezing.
Best materials for 15mm pipe insulation
Armaflex pipe insulation is the premium choice for 15mm pipes, offering a closed-cell structure that resists moisture and condensation — ideal for cold water pipes and air conditioning pipework. Kingspan Kooltherm pipe insulation delivers outstanding thermal performance in a thinner wall, saving space in tight installations. Foam pipe insulation is the most cost-effective option for straightforward domestic hot and cold water applications.
Shop 15mm pipe insulation
Browse our full range of 15mm pipe insulation or explore our complete pipe insulation range. Need help choosing? Call us on 0161 775 1190 (Mon–Fri 8am–4pm).
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