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Uncontrolled moisture is the most prevalent cause of deterioration in older and historic buildings. It leads to erosion, corrosion, rot, and ultimately the destruction of materials, finishes, and eventually structural components. Ever-present in our environment, moisture can be controlled to provide the differing levels of moisture necessary for human comfort as well as the longevity of historic building materials, furnishings, and museum collections. The challenge to building owners and preservation professionals alike is to understand the patterns of moisture movement in order to better manage it--not to try to eliminate it. There is never a single answer to a moisture problem. Diagnosis and treatment will always differ depending on where the building is located, climatic and soil conditions, ground water effects, and local traditions in building construction.
Do you even know what one is? If so, the Illinois Historic Preservation Agency wants too know! They are conducting and extensive, nationwide search to locate and identify so-called Mesker buildings. These buildings have ornate, sheet-metal facades and were built mainly in the late-1800s to early-1900s. They are a product of two companies – the Mesker Brothers Iron Works of St. Louis, Mo., and the George L. Mesker Company of Evansville, Ind. Although owned by brothers, the two companies operated independently. Producing similar products with architectural motifs rooted in the Classical Revival style, the companies are distinguished through subtle identifying characteristics. These companies specialized in storefront columns and cornices to entire facades made of the galvanized steel and cast iron construction.

The windows on many historic buildings are an important aspect of the architectural character of those buildings. Their design, craftsmanship, or other qualities may make them worthy of preservation. This is self-evident for ornamental windows, but it can be equally true for warehouses or factories where the windows may be the most dominant visual element of an otherwise plain building. Evaluating the significance of these windows and planning for their repair or replacement can be a complex process involving both objective and subjective considerations. The Secretary of the Interior's Standards for Rehabilitation and the accompanying guidelines, call for respecting the significance of original materials and features, repairing and retaining them wherever possible, and when necessary, replacing them in kind. This Brief is based on the issues of significance and repair which are implicit in the standards, but the primary emphasis is on the technical issues of planning for the repair of windows including evaluation of their physical condition, techniques of repair, and design considerations when replacement is necessary.