HOT, WET SUMMERS, HIGH LEVELS OF HUMIDITY + LITTLE CHANGE BETWEEN DAY/NIGHT TEMPERATURES

  • Movement of air is an important
  • Open up houses as much as possible
  • Use lightweight materials for the walls and roof
    • So they do not store much heat and shed heat quickly
    • ie steel or timber stud frame with metal, timber or fibre cement claddings
    • Avoid Heavy mass products, such as brick and block
      • Such mass re-radiate the heat they have stored during the day, which keeps the house hot after sunset
      • If must use, ensure they are well shaded
      • Windows should be shaded from the sun and protected from rain
      • The roof and/or ceiling should be insulated and roof space is well vented
      • Living room + bedroom has at least two openings
      • The building should be engineered to withstand cyclones
      • Develop a long, thin floor plan with as many rooms as possible having windows or openings on at least two walls to achieve maximum cross-ventilation
      • Provide covered external living areas that are positioned to catch the prevailing breezes in both the wet and dry seasons
      • Insulate the eastern and western walls
      • Using lighter, more reflective colours on roofs and walls
      • Raise the ceiling height to greater than 2700mm or using sloping ceilings with a minimum height of 2400mm
      • Choose windows that catch the breeze and can be left open in wet conditions,
        • ie louvres, casements or awning windows
        • Use awnings to shade windows and provide rain protection
        • Put high level windows or vents in all rooms, to let out the hot air and draw in cooler air
          • However it is important that windows or vents can be closed in storms
          • Avoid shrubs and dense planting up to 2100mm high that will block breezes, make internal rooms darker, and provide breeding areas for mosquitoes and other pests

 bamboo-house

Design for Natural Ventilation

  • Use the breeze for cross ventilation through openings in opposite walls and internal partitions
  • Maximise the area of windows (e.g. louvres) that can be opened
  • Orientate house to catch the breeze (whilst still minimising sun on east and west walls)
  • A long narrow floor plan catches the breeze best.
  • Trees and shrubs act to cool the air passing through the house.
  • Don’t use exposed concrete on ground immediately outside the house as it heats the air.
  • Roof space ventilation draws the heat out.
  • Dirty flyscreens block more breeze. Consider using openable/removable flyscreen shutters

PB_148-149

Minimum Insulation Standard

  • Light coloured well ventilated roofs: foil/sisalation
  • Other roofs: R1.5 batts and foil/sisalation
  • Full shading of wall is much more important than wall R-value. Unshaded, masonry walls store heat and release it well into the night.
  • Shelter windows with louvres, canopies, shutters or fixed overhangs – then you can enjoy the cooling effect of rain.

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Sources:

Housing For Health 

AETHOTEP Developments