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Eurobodalla Home Guide : 2010
16 eurobodalla home guide COASTAL DECOR One of the most important impacts BASIX compliance will have for you as a home builder or renovator is controlling how the sun will impact on the climate within your home, reducing the need for power consuming heat- ing and cooling appliances. When navigating through the BASIX process you may be confronted by words and abbreviations like U-value and R-value, and these can be simply interpreted. The R-value calculates the inherent thermal resistance or insulating properties of the mate- rials used in your building. A simple example is home insulation, graded as R3.5 which indi- cates the comparative thickness vs its thermal resistance (insulting properties). The U-value is a measure of the thermal transmittance (heat loss and gain) through materials used in your building. In the case of controlling direct heat and light from the sun quite often home builders use double glazing or special types of glass. However before you commit to installing expensive, specially glazed windows through- out your new home consider these issues that arise with glass. Firstly, there is little achieved by special glazing if you want airflow through an open window, as is the case on the coast to take advantage of the sea breeze. Secondly, glazing alone will not achieve effi- cient transmittance without some form of shading, which in most cases equals restricted vision, light and airflow. German company Markilux has invented a solution which deals with all of these issues in the form of a vertical tensioned awning system that is also see-through. An external shading system will work extremely well in most temperate climates; however in colder parts of Australia, it may not be sufficient to minimise heat loss and cold air transference through the glass. This can be recognised by the 'cold ankle' sce- nario, whereby the cold air passes through the glass causing a convection current of cold air across your floor making your lower body parts feel a chill. The simple solution, which is also most appropriate for our South Coast climate, is to use good quality reflective solar control inter- nal roller blinds, such as Enviroscreen by Verosol. Enviroscreen uses a unique process for applying Aluminium vapour to the external side of the blinds to achieve the high solar reflectance values needed for BASIX approval. Understanding how the U & R values work will allow you to better design your home, improving your own living environment immensely while complying with the needs to save the environment for those coming after us. For further information on Markilux awnings and Verosol's Enviroscreen blinds, contact Rod at Coastal Décor on 0407 630 000. PRP AR DB Ro d ors yth, Coa sta Déc or Builders Licence. No. 207313c For further clarification of R and U values refer to the BCA (Building Code of Australia), volume 2, section 18.104.22.168, Shading of Glazing. understanding BASIX the word BASIX can be a daunting one when undertaking a building project, however understanding of the reasons for it, and its end result, you will be more than amply rewarded