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As they were initially developed, some historic roofs were failures from the beginning, dependent on use of substances. Research on a construction may reveal an inadequately designed or an extremely combustible roof was replaced first in its history, and so restoration of a later roof material would have a valid precedent.
Ease and cost of care may dictate that the substitution of a substance from the original in appearance. The practical problems (wind, weather, and roof pitch) ought to be weighed against the historical thought of scale, texture, and colour. Sometimes the material's consequence will be minimal. But on roofs with a high degree of visibility and patterning or feel, the substitution can seriously change the architectural character of this building.
A simple covering of outside plywood or roll roof might offer adequate security, however any covering ought to be implemented with care. An individual ought to be careful not to overload the roof structure, or to harm or destroy historic signs or cloth that may be integrated into a brand new roof at a subsequent date.
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Precautions return to top The architect or contractor should warn the owner of some precautions to be removed from the dangers in installing the roofing material. Soldering of sheet plastics, for example, could be a fire danger, either by the open flame or from overheating and unnoticed smoldering of their wooden substrate substances.
Consideration should begin with the placement of modern plumbing on the inside of the building, otherwise a string of vent stacks may pierce the roofing membrane at various areas creating maintenance problems as well as aesthetic ones. Air handling units placed in the attic space will require vents that, consequently, require sensitive layout.
The additions should be produced as swiftly as possible, perhaps by painting them out with a color compatible with the local wall whenever downspouts and gutters are needed that weren't on the construction or trim. Return to exceptional problems inherent in the plan of a historic roof could be controlled through routine maintenance.
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Even though a brand new roof may be an object of beauty, it won't be protective for long without appropriate maintenance. At least the roof ought to be scrutinized against an inventory. All changes must be recorded and reported. Guidelines should be set.
To get someslate, asbestos, and clay tilea ladder may be hung over the ridge of the roof, or boards may be spanned across the roofing surface. Such things should be designed and kept in a storage space. Use caution to guarantee that the anchors put on, metal roof shingles or don't penetrate, break flashing, gutters, or the roof if exterior work requires hanging scaffolding.
Certain items must be checked at specific times. By way of instance, gutters have a tendency to collect leaves and debris during the spring and autumn and after rain. Hidden gutter screening both in downspouts and over the duration of the gutter could help keep them fresh. The surface stuff will require checking following a storm.
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Damage from water or ice is not as likely to a roof which has great flashing on the exterior and can be well insulated and ventilated on the interior. Instructions to the maintenance of the roofing materials should be accessible in the architect or contractor. Summary and References return to top The crucial components for replacing and maintaining a historical roof are: Understanding the historic nature of the building and being sympathetic to it.
Consideration of the historic craftsmanship and find local roofing contractors detailing and implementing these in the renewal observable. Supervision of the roofers or maintenance staff detailing of this undertaking and to guarantee comprehension of the extent and preservation of historical fabric. Consideration of alternative materials in which the first cannot be utilized. Cyclical maintenance software to assure that the staff knows how to look after the roof and of this trouble spots to safeguard.
This Preservation Brief was written by Sarah M Sweetser, Technical Preservation Services Division, Architectural Historian. A lot of the technical advice was based upon an unpublished report prepared under contract because of this office by John G. and Diana S. Waite.
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This publication was prepared pursuant to the National Historic Preservation Act of 1966, as amended, which directs the Secretary of the Interior to develop and make available information concerning historic properties. Technical Preservation Services (TPS), National Park Service prepares standards, guidelines, and other educational materials on responsible historic preservation treatments for a broad public.
New York: John Wiley and Sons, Inc., 1970. (Modern roofing types and detailing) Briggs, Martin S. A Short History of the Construction Crafts. London: Oxford University Press. (Descriptions of historic square deal roofing roofing materials) The Association for Preservation Technology Bulletin. Vol. 2 (nos. 12) 1970. (Entirely on roofing) Holstrom, Ingmar; and Sandstrom, Christina.