Perplexed by all this talk of u-values and blower door tests? Our sustainable building glossary will help you get to grips with the key terminology.

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Term Definition

Wastewater from baths, sinks, dishwashers, washing machines etc - essentially all a house's wastewater except that from toilets and macerators/food grinders

ground granulated blastfurnace slag

A steel-industry by-product that is used instead of traditional portland cement for 'eco' and 'green' cements and concretes. Because GGBS is essentially a by-product of an existing industry, it's considered to have a much lower embodied energy than portland cement

ground source heat pump

Heat pump that uses the ground - which has a fairly consistent temperature - as a heat source. Ground source heat pumps take heat from the ground and deliver it to internal spaces, using electricity to boost the temperature if needed