Keeping the the elements outside of the structure is critical to maintaining a suitable living environment. New Zealand has paid a huge price for not doing this well in the 1990's and 2000's. Water damage through a huge number of NZ homes has caused many issues. 

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Adopting the 4 D's is an excellent checklist for weather tight design:

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Deflection – keeping the water away from any entry points.

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Drainage – removing any water that does enter.

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Drying – allowing any remaining moisture to be removed by ventilation or diffusion.

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Durability – providing durable, low maintenance materials.