44 GLASS & GLAZING
window, the less heat that transfers to the external surface, meaning that the external surface is almost always significantly colder, causing outer condensation. Quite contrary to what some may assume, outer condensation is in fact indicative of highly efficient glazing, and is nothing to worry about.
SANDWICHED CONDENSATION This is the condensation that really causes hassle. Internal or external condensation can be mopped and polished, but it is when moisture somehow seeps its way into the cavity between the two layers of double glazing that annoyance is caused. It looks unsightly, is virtually inaccessible and cannot be remedied by any simpler means than having windows removed and replaced. In extreme cases, this space can fill up with water. Unfortunately, traces of moisture between the layers of a double-glazed window are a sure sign that sealings have failed and that the glaze is no longer air- or water-tight. Take care to consider the conditions: temporary inner condensation can be caused by periods of high humidity or particularly cold weather, or in bathrooms and kitchens where short bursts of humidity are expected. However, should you notice condensation between layers
that is still there after some time, or when conditions have changed, it is likely that they need replacing. Once sealing has given way, the whole window will decay quite abruptly, so it is important that any instances of moisture are monitored and acted upon.
CONDITIONS Very often, condensation comes down to conditions, some of which are controllable and others which are not. But in any case, the only time condensation becomes a
real issue for glazing is when it is sandwiched between the layers, at which point nothing but replacement can solve the problem. In the meantime, give a bit of extra consideration for the temperature and conditions of the building. Maintain both comfortable heat and ventilation to sustain thermal efficiency, keeping air and heat flowing.
Will Goodenough is key account manager at Whitesales
WWW.HBDONLINE.CO.UK
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