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close this book Prevention and treatment of mold in library collections with an emphasis on tropical climates: A RAMP study
close this folder 4. Prevention
close this folder 4.1 Building design and modification
View the document 4.1.1 Location
View the document 4.1.2 Structural considerations in environmental modification

4.1.1 Location

The various climatic zones discussed in the introduction are important in determining the requirements of a new building, or the best methods for modifying the enviroment in existing structures. Fry and Drew3 provide additional information on the particular variations between continental and island locations which will be helpful in modifying the environment. Only general guidelines can be included here.

In the tropical rainforest climate (Af) where conditions are relatively uniform year round, temperatures are seldom extremely high (usually less than 90 F), and winds are light or non-existent, the major effort should be concentrated on improving circulation and lowering the relative humidity.

In the monsoon climate (Am) the stronger prevailing winds may be used to advantage for improved ventilation and circulation and more resources can be devoted to lowering the relative humidity, especially during the rainy months.

In the tropical savanna (As or Aw), with three distinct climatic seasons, more elaborate systems may be required. During the dry, hot seasons, dust and dirt will be a particular problem. The building must be capable of being closed against dust during this period, while maintaining adequate ventilation in order to prevent the build up of heat in the interior of the building. The problems associated with extremely high temperatures, dust and desiccation may make air conditioning the most important factor in maintaining collections in these conditions. Because there are two dry seasons and a relatively short wet season, mold may be a problem for only a small portion of the year, or not at all. Every effort should be made to prevent extreme fluctuations in RH between seasons. The utilization of natural ventilation in savanna climates varies from that in the Af and Am climates. Okley4 provides several useful diagrams suggesting possibilities for natural ventilation in As and Aw climates.