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Buildings in Tropical Areas

 The secrets of effective and cost effective ventilation in tropical areas.

  1. The lower the air inlet, and the higher the outlet, the more a tropical building will self ventilate (chimney effect).
  2. Louvres at low level, holes in the walls or ventair sheet make good vents. The people tend to work at ground level, not up in the air, so the air current should be close to the ground. (A common error is to put ventilation at the eaves).
  3. Openings too close to the ground may let in dust and dirt and intruders.
  4. Opening doors for ventilation slows the chimney effect, and prevents air changes away from the aperture.
  5. Openings at eaves level may help to stop the ceiling space from over heating but stop the chimney effect and do not produce draughts near the ground. (It is the light that should be let in under the eaves overhangs).
  6. With no ridge ventilation the temperature increases, highest at the peak, but still heating up lower down.
  7. Powered ventilation can increase air flow but must be directed to benefit from the wind direction, not oppose it.
  8. The amount of dust in the air reduces with height. In dusty windy conditions air should be pumped in from as high as possible. A still air box will help. Filter papers or beds will need constant maintenance to remain effective.

 
REIDsteel Ridge Vent can extend the full length of the buildings, or 5m short of full length in hurricane/cyclone areas.

The ventilated masonry or louvres at about 1.3m above floor level causes the chimney effect, allowing air to pass through the building.

 
Opening the doors reduces the chimney effect and cuts out the ventilation around the rest of the walls.

 
Ventilation under the eaves reduces the chimney effect and prevents circulation near the ground

 

 

Sheeting

To give the best protection in tropical countries we advise that you should use only:

 

PVC Plastisol on galvanised steel

Standard Colour Range (Most suitable for all temperature climates)

Hamlet
Goosewing Grey
Honesty
Mushroom
Moorland Green

 

Non Standard Range

White (Walls only)
Albatross
Meadowland
Bamboo

 

Polyester or PVF2 Colour Finish on Galvanised Steel or Long Life Armocor

White
Oyster
Morocco
Glen
Mountain Blue

 

This is because light colours generally last longer in tropical climates or areas with high UV and of course are a lot cooler. The white will go up to 50°C during the day; dark colours may reach 110°C.

 

Double Sided Enamel

In corrosive environments the cladding corrodes from the under side. You should use double sided enamel, if near the sea or in other corrosive conditions. If the inside enamel is white, there is a double advantage: the white makes the interior brighter, with less need for direct sunlight; and the white radiates less heat inside. A correctly ventilated tropical building with light colour/white double sided enamel cladding will feel comfortable, and may be better than providing insulation. If you can afford the slight price difference, Armocor outer surface with white enamel inside is recommended.