22 


  


Preventing condensation takes a joined-up approach, and insulation is a big part of it. David Milner, Technical Team Lead at Celotex, shares more about why smart insulation choices, backed by expert guidance, are key to keeping moisture at bay...


Effective condensation control in buildings can be summed up as a three-pronged strategy: insulate correctly, provide adequate ventilation and manage the movement of moisture. The complexity of moisture management in buildings can mean that implementing these three elements is far from simple.  have no control over how the eventual occupants will use a building.  and detailing decisions, together with appropriate ventilation solutions, are crucial.


What causes condensation in buildings, and why is it a problem? When we talk about condensation risk, we are really talking about two different types of condensation, surface condensation and interstitial condensation. What is surface condensation? Surface condensation refers to moisture that forms on the surface of a building element when warm, humid air comes into contact with a cooler surface. It may occur as a light dampness or, if the accumulation of moisture is large enough, it could form into droplets that run down the surface.


This process occurs when the surface


cools the surrounding air below its dew point temperature, the point at which air can no longer hold all its water vapour, causing condensation to form on the surface. The dew point varies depending on the air’s temperature and relative humidity. Window panes are the most obvious


example of surface condensation occurring, because window glass  other surfaces. If a wall or ceiling is cool enough (or the air humid enough) for condensation to occur on its surface.


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