WEATHER RESISTANCE Firstly the rainwater will not disperse effectively from the glass (see image opposite showing how rain droplets like to adhere to glass even on a vertical plane). If the rainwater is not able to shed naturally from the glass due to a sufficient slope within the design then it will dissipate through evaporation. Fine? Well no, not really. Dust in the air will be caught by the raindrops and the evaporation of the water will leave a series of 'water marks' on the glass which will build up over time. This again is not a problem if the roof glazing is subject to a regular cleaning schedule. So please do ensure that if you are designing roof glazing with a very shallow pitch that there is easy access to the roof glazing to allow for cleaning on a regular basis. If this isn't carried out then it won't be long before not just water marks are on the glass but a full garden beginning to take root! Opening Vents and low pitched roof glazing |