We have specified basic materials for our Domus which are cost effective and locally produced. Domus incorporates galvanised steel RHS columns for vertical support. These have a flat steel plate welded onto the base to resist lift from some spasmodic high winds. The excavation for the footings are slightly bell shaped again to resist lift from winds. These columns extend from sub-ground through to the roof where they are tied to the rafters using galvanised hoop iron. The flooring system specified uses a combination of Cooktown Ironwood as a frame of long span bearers and joists with Cypress pine floor boards for flooring. These are both cost effective and locally grown timbers which have a high resistance to termites. Ironwood and Cypress Pine is grown in plantation conditions and is native to the Northern Territory. These timber species are also specified for the roof beams, rafters and battens. External cladding for Domus is locally stocked galvanised Colorbond steel in Oxide Red with a standard corrugated profile. Other items such as rainwater tanks and black and grey water systems are to be transported in kit form from Darwin.
Attached is a link to information on locally grown timbers and issues in relation to termite damage in the area.
http://www.daffa.gov.au/__data/assets/pdf_file/37618/Ironwood_in_NT.pdf
http://www.termite.com.au/termites/nt.html
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