Technical

Part Q and security testing for glass rooflights

From the 1st October 2015, Building Regulations have been updated to include Security of Dwellings under Approved Document Q, which has implications for the specification of rooflights. The changes do not apply to work started before 1st October 2015, work subject to a building notice or for planning submitted before that date provided work commences… Read more

When thermal breaks should not be used for glass rooflights

We have already demonstrated that the use of thermal breaks within aluminium extrusions can be an effective way of managing heat transfer and cold bridging. However there are occasions where the design of the framework means that including a thermal break can actually reduce performance. The simulation below shows a fixed glass rooflight bonded into… Read more

What is a thermal break and how does it work for glass rooflights?

Most modern contemporary rooflights are designed using lightweight aluminium or steel frames for several good reasons: They provide great weight saving and strength, and also require little to no maintenance when compared to wooden frames. Using these types of materials does have one major disadvantage however, in that metals are extremely efficient conductors of heat,… Read more

What are ‘in plane’ and ‘out of plane’ rooflights?

Predominately an ‘in plane’ rooflight is a rooflight that is in plane (by which we mean flush) with the rest of the roof that it sits on. An in plane rooflight doesn’t require any changes to the pitch of the roof, for example a Velux roof window. Other examples would be polycarbonate or GRP sheeting… Read more

Structural floor loadings for walk on glass rooflights

Structural floor loadings for walk on glass rooflights should be stated as Uniform Distributed Load (UDL) and Concentrated Load. Although you should expect a manufacturer or supplier to confirm what loadings the glass is designed to withstand, you should not expect them to provide information on the loadings themselves; this remains the responsibility of the… Read more

What’s the difference between non-fragile and walk on rooflights

Terms such as ‘man safe’, ‘walkable’, ‘walk on’ or ‘non-fragile’ are often used in the construction industry, but these terms should be treated with caution and the specifier should understand the difference when looking to install this type of product. Firstly, all walk on rooflights must be manufactured using glass. GRP or Polycarbonate materials can… Read more

Anti-slip glass for walk on glass rooflights

Glass can become slippery when wet and common sense should be applied when specifying this material for walk on applications such as walk on rooflights. This is of particular importance when the glass is being installed where the public can access it. On a private dwelling it is less likely that the glass will be… Read more

How does non-fragility affect glass rooflight specification?

When it comes to the design and performance of glass rooflights, it’s usually aesthetics and thermal performance that are top of the list of specification considerations. However, the performance of the rooflight for safety, as an overall part of the roof, is another important factor. It is important to note that there is no legal… Read more