Climate and Health in Hot Countries and the Outlines of Tropical Climatology / A Popular Treatise on Personal Hygiene in the Hotter Parts of the World, and on the Climates That Will Be Met Within Them.

by George Michael James Giles

It is needless to say that the reverse is actually the case, and that other things being equal, upper storey rooms are necessarily cooler and more healthy, on account of their better exposure to the breeze and their being to a great extent raised above dust and other more subtle emanations from the soil. The reason for this misapprehension is that, outside the Presidency towns, upper rooms are almost universally makeshift additions, with no proper verandah protection, and often flimsy roofs. Now it is obvious that to gain the full advantage of an upper storey, all verandahs should be carried right up, so that except in being elevated above the soil, the upper rooms are exact reproductions of those below them. I cannot recall, however, a single instance of a properly planned two-storied house “up-country,” and it is absurd to expect that a room with thin brick walls, exposed directly to the sun’s rays, can be as comfortable as one with massive walls and broad verandahs. It may be admitted that during the day, when the doors are shut to keep out the heat, the upper rooms of a two-storied house will be hotter than the lower ones, because one has but a single roof overhead in place of two, but they will be cooler than the lower ones would be, assuming the upper story to be removed.

It is also extremely desirable that the plan of the house should include a stair giving access to the roof, as during the hot dry season, there can be no doubt that it is by far the healthiest plan to sleep there.

A small area of thatched roof supported on four pillars should be erected on the roof to protect the sleeper from dew, and to prevent his being worried by the glare of the moon, which to say the least of it makes it very difficult to sleep. Whether there is any truth in the belief that exposure to the moon’s rays may cause blindness or not, I cannot say, but I certainly have met with a number of cases of temporary blindness for which it was, to say the least of it, extremely difficult to find any plausible explanation other than the popular one. Moreover, as we are quite in the dark as to the modus operandi of true sunstroke, it seems unscientific to deny that over-stimulation of the retina by the moon’s rays can be capable of producing the symptoms in question, and at any rate it is preferable to act on the assumption that “moon-blindness” may be a possible contingency.

It is, further, a matter of great importance that the upper limits of the air-space included within a room should be ventilated by means of openings placed close up to the ceiling, as otherwise a stratum of impure, heated air will lodge there, which can only be removed by the slow action of diffusion. In one-storied houses this is usually effected by means of small windows, and in order to admit of a sufficient number of these being provided, it is a common expedient to carry the walls of rooms situated in the interior of the house above those of the lateral rooms, as shown in [fig. 4]. There should, however, be no necessity for doing this, as no room should be ever built with no external wall; and though upper openings on more sides than one may be desirable, this is not so essential as to warrant the large increase of cost involved in building in this way. Where a house has an upper storey, the top ventilation of the lower rooms is usually effected by openings into the verandahs; but this is by no means a satisfactory outlet, and it would be far preferable to effect the purpose by means of shafts carried up in the thickness of the walls to the roof, the long column of air within which would favour the production of a good current.

In certain parts of the East, subterranean chambers (taikhana) are used as a refuge during periods of extreme heat, and are occasionally to be met with in very old European bungalows, though I have never seen one in actual use. Good examples are to be seen in the ruins of the historical Residency at Lucknow; and it was within them that many of the women and children were sheltered during the memorable siege. They can, of course, be ventilated only from above; but there can be no doubt that they are cooler than rooms above ground, and it is possible that the principle might be adopted with advantage under certain extreme climatic conditions.

The materials appropriate for house-building necessarily vary according to the character of the climate, but it is desirable to consider briefly the advantages and disadvantages of those in most common use. Taking first the structure of the walls, it may be noted that in rainy climates near the coast, where very high temperatures are seldom registered, the materials can hardly be too flimsy and permeable; but as one recedes from the coast and meets with the extreme climates characteristic of the interior of continents, it will be found that the buildings become progressively more massive; so that while the Bengali or Malay inhabits a shanty formed of thatch and matting, the peasant of the Punjab shelters himself within mud halls some two feet thick. These differences in domestic architecture are the necessary outcome of differing environment, and to be comfortable, European houses must be built of very much the same materials as those of the natives around them.

In dry climates, sun-dried bricks make an excellent wall, which resists heat even better than one of burnt brick, and provided it be protected from rain, it is wonderfully permanent and much stronger than would be expected; so that heavy, terraced roofs are easily carried by a two-feet thickness of this material, and they are even quite adequate to sustain a second story of lighter materials. The great drawback of the material is that it forms a favourite haunt for white ants, which tunnel it in all directions; but this can easily be obviated by introducing, just at the floor level, a single course of some damp and insect-proof material, such as burnt brick, laid on cement and tarred. Owing to its extreme cheapness a large house can be built for the same expenditure as a small one of burned brick, and as air space is of the greatest importance in hot climates, it is unfortunate that this material is not more utilised in Government buildings.

Flooring.

—The most suitable material is stone flagging, marble, of course, being preferable. After these come hard tiles, brick on edge, and cement, in order of desirability. Besides these there are, of course, various special modern inventions, but they hardly come into practical consideration, outside large seaports. Wooden floors should be generally avoided, as owing to decay and the attacks of insects, they are apt to become dangerous, and may give way unexpectedly at any time. For upper floors, by far the most suitable material is the narrow brick arch supported on steel girders, which are now so generally obtainable and cheap, that they can be economically substituted for wooden beams in any locality tolerably accessible from a railway.

One great advantage of this form of construction of flooring and terraced roofs, is the entire absence of nooks and crannies which can harbour vermin, for even the equally massive roofs of concrete, laid on flat tiles supported by a system of beams and battens, afford most dangerous refuges for disagreeable intruders, and I well remember an inmate of my house being put to intense suffering on two successive nights by vermin that fell from such a roof; the first disturber of our rest being an enormous centipede, and the second a hornet. For the same reason, all cornices and similar architectural adornments are distinctly to be deprecated.