LIGHTING & ELECTRICALS ROOFLIGHTS & SKYLIGHTS
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How to choose the right type of rooflight or skylight for your home Delve into the world of rooflights and skylights with IQ Glass, as the specialist in architectural glass and glazing solutions explores their unique differences and benefits.
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hile there may be some overlap in the terms ‘rooflight’ and ‘skylight’, there can be some technical differences between the two. In general, a rooflight is installed flush with the roof surface, while a skylight is typically raised above the surface and mounted on a frame. Skylights may also be larger and more complex in design than rooflights. That said, both rooflights and skylights can provide similar benefits, such as increasing natural light and ventilation. When choosing between the two, it may come down to personal preference and the specific requirements of the project. With regards to planning permission, it is always best to check with the local planning authority before undertaking any work. While flat rooflights may not require planning permission in some cases, there may be restrictions on size, height and projection. It is also important to ensure that the installation complies with appropriate standards for thermal performance and safety. Other important factors when choosing a rooflight or skylight are building type, size and orientation, as well as the desired amount of natural light and ventilation. The design and placement of the rooflight or skylight I-B U I L D/ J U LY/23
should also take into account the layout of the room and any potential impact on heating and cooling. North-facing rooms are generally much cooler with limited natural light; therefore, rooflights maximise the amount of natural light ingress into the space. Pitched roof skylights can be a great option for adding natural light and ventilation to a loft conversion or extension, and they can work particularly well in listed or heritage buildings where preserving the character of the property is important. In terms of thermal performance, it is important to ensure that the skylight meets appropriate U-value standards to minimise heat loss and maintain energy efficiency. The size of a rooflight can have a significant impact on the overall design and function of the space. A larger rooflight can provide more natural light, creating a brighter and more open feel to the room. However, it can also create a sundial effect where the movement of the sun across the sky creates patterns of light and shade on the floor and walls. While some people may enjoy the aesthetic of the sundial effect, it is important to consider the practical implications as well. Depending on the orientation of the rooflight and the position of the sun, it could
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create glare or excessive heat gain, particularly in warmer climates. Other factors to consider when choosing a rooflight or skylight include the material of the glazing (such as glass or polycarbonate), the framing material and the method of operation (such as fixed or openable). It is also important to ensure that the installation is carried out by a qualified professional and that it meets all relevant Building Regulations and safety standards. An interesting fact with regard to all roof glazing is that all Ug values given for architectural glazing are always calculated in their vertical position. Changing the angle that the glass sits at in roof glazing alters the thermal performance and the Ug value of the glass changes. This is due to the convection currents that occur inside all double- or triple-glazed units. This change in thermal performance is important to note as it will affect the overall Uw value for structural glass roofs and rooflights and may make it difficult to achieve the requisite Uw values for a project if not addressed correctly. IQ Glass possesses extensive knowledge of architectural glazing, with more than 20 years working alongside architects to deliver on design vision.
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