BUILDING FABRIC 45


RAISING THE STANDARD FOR ROOFING IN 2025


Lisa Grosse of Cedral discuss the impact the Future Homes Standard could have on current facade and roofi ng trends when introduced next year


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iscussions around sustainability, futureproofi ng and a fabric fi rst approach, which have been taking place across construction generally, have become increasingly prominent for housebuilding. esigning to achieve greater thermal effi ciency will become more of a priority to comply with the new uture omes tandard . his will reuire all new homes built from  to produce - fewer carbon emissions than present. While many architects, developers, contractors and manufacturers involved in residential construction have been proactive in making modifi cations to reduce carbon emissions, there is much more to do.


ENERGY EFFICIENCY & THERMAL PERFORMANCE


s many of the new  reuirements specifi cally concern ventilation and energy use and for new build homes to be an effi cient fabric, this has a direct impact on decisions about facades, roofi ng and insulation. ptions for the facade include timber, stone, vinyl, metal, weatherboard, fi bre cement, concrete and glass. ire safety, aesthetics, durability, ease of installation, impact on thermal


control and indoor air uality, acoustics and cost both the initial expense and over the products lifetime are all part of the euation. We often see a combination of materials on the facades of housing developments.  very large proportion of housebuilders, for instance, will use a render on the exterior of the ground  oor and then a cladding material such as edral on upper  oors.


ne of the trends we are seeing for the exterior is more natural products such as fi bre cement cladding.  strong, versatile and sustainable material containing cement and fi bres, it uses fewer raw materials and less energy in its manufacture and produces less waste than some traditional building materials. When specifying, durability under extreme temperature changes, low maintenance and in particular, having an  fi re classifi cation rating, have been key and fi bre cement cladding offers these benefi ts.


ptimising the performance of the roof is also central to the houses energy effi ciency as one uarter of all heat energy in a home escapes through the roof. urrently the overnment is not mandating the installation of rooftop solar panels on all new homes, but it


is logical to plan a roofi ng system that makes it possible. or roofi ng, the most commonly available materials are concrete tiles, terracotta tiles and fi bre-cement slates. here has been growth of fi bre cement slates in the market because they are sustainable, have a good -value, have an excellent fi re classifi cation, are lighter, and also for their aesthetics.


THE OPTIONS & BENEFITS AVAILABLE FOR FHS COMPLIANCE WITH INSULATION s a result of the new building regulations, new homes will have to be better insulated to reduce heat loss and mitigate against overheating. he uestion is whether to put the insulation on the outer or inner walls, and there are pros and cons of both options. or exterior insulation, boards are fi tted to the outside of the walls, before covering the facade with rainscreen cladding such as timber, metal or fi bre-cement weatherboards. he advantages of ventilated rainscreen cladding are that it increases energy effi ciency, extends the lifetime of the facade, helps reduce condensation and humidity and helps reduce structural movement.


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