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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In Australia’s sunny climate, solar water heating is an excellent alternative that can significantly reduce the environmental impact from households.
Graffiti is one of the more obvious and annoying forms of vandalism. It can be found in most urban environments but some buildings attract far more than others.