Routine maintenance is post construction activity which is required to be attended for up-keeping of the building to resist its early decay causing severe damage to it and saving it from becoming non-functional. There are various items of work which fall under routine maintenance and are expected to be attended regularly for up-keeping of the building some of the items need be attended daily, some weekly, while some at regular interval. Routine maintenance includes cleaning, servicing, oiling, greasing, renewal of plastering, painting walls, painting woodworks, etc. Now, if the timber is left without maintenance, i.e., without renewal of surface painting, the timber member would show signs of decay early and its strength after 5 decades would be much less than was assumed. With this assumption, timber is considered to lose 40 % of its strength in 5 decades. For instance, a timber member is assumed to be painted at regular intervals. While designing, the life of the members is assumed with normal maintenance. These are all susceptible to natural decay due to ageing. A building is made of different parts in different locations and made of different materials. Routine maintenance of the structure is essential to keep it functional and protect it against early decay.
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