Keep surface temperatures above the ‘dewpoint’ to stop condensation
In addition to the ambient temperature and the pipe temperature the surface temperature of an insulation material is influenced by a number of factors:
There are two critical factors over which control can be exerted to ensure surface temperatures above the ‘dewpoint’. These factors are the
insulation thickness and the
A dark surface finish controls surface temperature efficiently
Surface emissivity is a measure of how effective a surface is at radiating heat – with black bodies being better emitters than bright reflective surfaces. Since most water vapour barriers take the form of a bright Aluminium foil, selecting a material like Kaiflex that has an in-built water vapour barrier allows more control over the surface emissivity.
A non-reflective black surface gives a high emissivity finish and is by far the best surface finish for controlling surface temperatures. This can dramatically influence the insulation thickness needed to prevent condensation.
Using the correct insulation thickness avoids condensation