Most of the paper produced today has a life expectancy of less than 50 years. The rate of deterioration is dependent upon several external factors, such as environment, storage conditions and handling procedures. Fluctuations in temperature causes paper to expand or contract as the temperature increases or decreases and causes paper to weaken and break. It is best to store historical materials in an area that has constant temperature control. Avoid areas that only have heating and cooling on weekends.
Attics are awful locations for the storage of valuable material.
Humidity fluctuations combined with temperature fluctuations can weaken paper. An additional result may be the growth of mold which stains, softens and crumbles paper. Basement corners can have high levels of humidity and should be avoided as storage sites. The most effective way to maintain a constant environment is through air conditioning. Air conditioning can be the most important factor in the preservation of collections.