Business Management

Author: Haroon Khalil

  • Sources of Dampness

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    Haroon Khalil
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    Dampness in a building may be caused due to natural causes or structural causes. 1. Natural Causes Natural causes may be due to: (i) Penetration of Rain Rain may penetrate a building through the top of the walls, through the surface of the walls and through the roof. Rain may penetrate the unprotected parapet walls…

  • DAMP PREVENTION

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    Haroon Khalil
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    Presence of hydroscopic moisture on a surface is called dampness. In general dampness causes unhygienic conditions, affects the health and comfort of inhabitants. Further, it deteriorates the stability of the damped surface. Thus, it is an essential feature in construction to prevent dampness.

  • Methods of Termite-Proofing

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    Haroon Khalil
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    Termite-proofing methods may be grouped under the following two categories: 1. Soil Treatment with Chemicals (i) Chemicals for Treatment Following are the emulsifiable chemicals recommended in BIS code: Chloropyrifos has been widely used. They are available with agrochemical agencies which are used to control termites in crops. This chemical with 1% concentration is mixed in…

  • Principles of Termite-Proofing

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    Haroon Khalil
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    While making a building termite-proof, the following points have to be observed:

  • ANTI-TERMITE TREATMENT

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    Haroon Khalil
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    Termites Termites, popularly known as white ants, are found in groups in tropical and sub-tropical countries. They are very fast in eating wood and other cellulosic materials as food. They also damage non-cellulosic materials like plastics, leather, etc. The term termite-proofing is used to indicate the treatment which is given to a building. This is…

  • INTRODUCTION

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    Haroon Khalil
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    Although buildings are constructed based on the space requirement and safety needs, they are also to be protected from natural calamities such as action of termites, dampness, fire, lightening, earthquake, etc. Steps taken during construction itself to protect the buildings from the above calamities the durability and life of the building will be increased. Termites…

  • Quilts and Mats

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    Haroon Khalil
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    These materials are made out of mineral wool or glass wool. The coefficient of absorption varies which depend on the thickness of the board or mat, density, perforations, mode of fixing and frequency of sound.

  • Perforated Boards

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    Haroon Khalil
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    The material can be formed by combination of mineral wool and cement asbestos or with mineral wool and hard board. The coefficient of absorption for the first combination is about 0.95 and for the latter is 0.20. Such boards are generally suspended from trusses.

  • Porous Boards

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    Haroon Khalil
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    Straw boards, pulp boards and compressed fibre boards have varied coefficient of absorption. These boards can be fixed by ordinary panelling. The thickness is about 17 cm and coefficient of absorption varies from 0.17 to 0.50.

  • Acoustic Tiles

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    Haroon Khalil
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    These are commercially available materials with adequate absorbent qualities. The absorption of sound is uniform and most suitable for small rooms. But it is costly compared to other acoustical materials.