INSULATION 73 THE RACE FOR SPACE


Kevin Gamble of Saint-Gobain Weber explains how steel frame construction with external wall insulation (EWI) can help to increase not only thermal effi ciency but internal area when building new homes and extensions.


T


he shortage of skilled tradespeople to build homes in the traditional way has been a real problem for a number of years, and the situation isn’t going to get better any time soon. This is one of the reasons we will need to rely on the development of new systems, such as framed construction, to help us address the housing crisis. Developers, housebuilders and housing associations are starting to realise the benefi ts of offsite and modern methods of construction – quicker build time, improved build quality, cost savings and less reliance on skilled labour. But until recently, little attention has been paid to the other obvious benefi t associated with new methods of construction such as steel frames: more space.


Masonry construction is typically thick, heavy and slow. Several bricklayers, even with years of experience, could take weeks to construct a typical four-bedroom home. And there’s also another important point which needs to be considered. As Building Regulations progress towards the Future Homes Standard in 2025, achieving the required U-values will likely become harder to reach with masonry construction.


Choosing a lightweight steel frame system can reduce the need for hefty foundations  signifi cantly reducing build time and in turn cost. A high quality, prefabricated system can be installed by a less experienced workforce. In addition, constructing with a steel frame is not reliant on good weather, and there are fewer inherent concerns that may exist with a timber frame system for example, such as height limitations or the possibility of shrinkage.


EWI SYSTEMS


Steel frames are a very reliable form of construction and when used with a good I system there are huge benefi ts. Using an EWI system improves the thermal performance of a building and therefore, the interior comfort. Because EWI is suitable for most building types, it can be used to add insulation to existing brick buildings and enables anyone renovating or upgrading a home to decorate and remodel with whatever


fi nish they reuire. It can even be fi nished with a brick slip system to give the appearance of traditional brick but is installed in a fraction of the time. The whole concept of EWI means it’s ideal for new build structures as it simplifi es the wall construction and is very lightweight. And as it delivers great


thermal effi ciency with much narrower walls, with costs soaring, any gain on internal space is a win-win for both developer and homeowner.


A conventional masonry construction would require a 102 mm brick, 100 mm cavity and 100 mm block. Add to that a 12.5 mm plasterboard and a 3 mm layer


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