Choosing Glass For Overhead Glazing
With the myriad of glass types available now, it is often confusing what to choose in terms of safety, thermal and solar performance and balancing cost with the benefits on offer.
Richard Burgess, MD of patent glazing and roof light manufacturer Lonsdale Metal Company Ltd shares his experience of thirty years in the industry.
Safety - Above all, safety is the critical factor in overhead glazing and the table summarises what type of glass complies with current Building Regulations at time of writing.
From time to time, it is desirable to use Wired Glass in double glazed combinations. However, there is a high risk of breakage due to thermal stress and advice should be sort from the sealed unit manufacturer.
Glazing Height above floor level
Suitable types for Single Glazing
Suitable types for Double Glazing
Upto 5 Metres
Toughened, Laminated or Wired Glass
The inner pane must be Toughened or Laminated. The upper pane should be Toughened in either instance.
5 to 13 Metres
Toughened glass not more than 6mm thick and panes not larger than 3sq/m. Laminated or Wired Glass
The inner pane must be Toughened or Laminated. The upper pane should Toughened in either instance.
Above 13 Metres
Laminated or Wired Glass
The lower pane must be Laminated
It is not recommended to use toughened glass in single glazing or to the inner pane of double glazed units over swimming pools, food & beverage preparation units or any areas where the small broken pieces characteristic to this glass type, could cause subsequent injury due to contamination. In these situations laminated glass or polycarbonate would be the best choices.
Double Glazing - More or less without exception, the outer pane of a double glazed unit should be toughened glass. The inner pane may be toughened or laminated depending upon location and height above ground. Generally two sheets of toughened glass provide the most economical solution for domestic projects where the roof light is no more than 5m above floor level. If the height exceeds this, then laminated glass should be used for the inner pane. When it comes to performance, the following are features to consider:
Low-e coating – offers improved thermal efficiency retaining more heat within the building.There are two types available standard ‘hard’ coat finish or the more popular ‘soft’ coat which offers a typical centre pane uvalue of 1.2W/m2 when combined with an argon filled cavity.
Tinted anti-sun glass – body tinted toughened glass can be used as the outer pane combined with a laminated low-e softcoat glass to give the added benefit of reducing solar heat gain in the summer months at reasonable cost. This is most commonly used in blue, but green, grey and bronze colours are also available. Typically this provides a 50% reduction in solar transfer and 50% light transmission.
Neutral solar control glass – has a special coating that provides improved solar control and appears more neutral in colour albeit with a slight grey/green tint. This is often described as 70/30 meaning it offers a 70% light transmission, but only 30% of the sun’s heat enters the building.
Triple Glazing - All of the above glass types can be combined in triple glazed units achieving both improved sound insulation and U-values as low as 0.60W/m2.K. Consideration however, must be given to the additional weight and handling during installation.
Large Pane Rooflights - The most economic glass tends to be 4-6mm thick which rarely can be installed wider than 1000mm, hence most domestic roof lantern and conservatory installation featuring glazing bars every 600 to 900mm. However, with the current trend for flat rooflights, single pane rooflights can be installed up to 3m x 6m in one pane of glass. This calls for specialist manufacturing and installation by experienced companies with the necessary handling equipment and expertise. Much thicker toughened & laminated glass is required so as not to deflect and care must be taken to ensure compliance with building regulations and local, design wind & snow loads.
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