A wall or roof underlay is very different from a vapour barrier. One lets moisture through and out of a building and the other doesn’t. Using the wrong one will trap moisture where you don’t want it.
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Australia’s vulnerability to droughts, coastal erosion and temperature increases, along with its high greenhouse gas emissions, means it must take climate change seriously when looking at urban design for the future.
In Australia’s sunny climate, solar water heating is an excellent alternative that can significantly reduce the environmental impact from households.