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5.9 Roof Technical Guidelines

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5.9 Roof Technical Guidelines 5.9 Roof Technical Guidelines 5.9.1 INTRODUCTION should be understood. Then a complete internal and external inspection of the roof should be planned to determine all the causes of failure and to identify the alternatives for repair or replacement of the roofing. The essential ingredients for maintaining and replacing a historic roof are: A weather-tight roof is basic in the preservation of a structure, regardless of its age, size, or 1) understanding the historic character of the design. In the system that allows a building to building and being sympathetic to it, work as a shelter, the roof sheds the rain, shades 2) careful examination and recording of the from the harsh sun, and buffers the weather. existing roof and any evidence of earlier roofs, During some periods in the history of 3) consideration of the historic craftsmanship architecture, the roof imparts much of the and detailing and implementing them in the architectural character. It defines the style and renewal wherever visible, contributes to the building's aesthetics. The 4) supervision of the roofers or maintenance hipped roofs of Georgian architecture, the turrets personnel to assure preservation of historic of Queen Anne and the graceful slopes of the fabric and proper understanding of the scope Bungalow designs are examples of the use of and detailing of the project, roofing as a major design feature. 5) consideration of alternative materials where the original cannot be used, But no matter how decorative the patterning or 6) regular maintenance program to assure that how compelling the form, the roof is a highly the building owner or staff understands how vulnerable element of a shelter that will to take care of the roof and of the particular inevitably fail. A poor or unmaintained roof will trouble spots to safeguard. permit the accelerated deterioration of historic interior building materials - masonry, wood, With these points in mind, it will be possible to plaster, paint - and will cause general preserve the architectural character and maintain disintegration of the basic structure. the physical integrity of the roofing on a historic Furthermore, there is an urgency involved in building. repairing a leaky roof since such repair costs will quickly become prohibitive. Although such action is desirable as soon as a failure is 5.9.2 PHYSICAL EVALUATION discovered, temporary patching methods should An important step to maintaining the roof of a be carefully chosen to prevent inadvertent commercial or residential building is the damage to sound or historic roofing materials identification and evaluation of existing roof’s and related features. construction type, structural stability of the roof structure, architectural features and roof Before any repair work is performed, the materials. historic value of the materials used on the roof Grapevine Design Guidelines – Roof Technical Guidelines 5.9 - 1 Roof failures may be categorized into two can collect debris and thus back up, perhaps groups – those that require routine maintenance leaking water into the surrounding walls. or replacement of roofing materials, and those Exterior downspouts may fill with water, which that are more complex and require professional in cold weather may freeze and crack the pipes. assistance. Conduits from the built-in gutter to the exterior Routine maintenance roof repairs or replacement downspout may also leak water into the may include damaged roof shingles, a roof surrounding roof structure or walls. shingle that has fallen from its location, or replacement of the roof due to its age. Failure of the roof flashing is usually a major cause of roof deterioration. Flashing should be If the roof problem is more complex than this, it carefully inspected for failure caused by either may be necessary to contact a professional, poor workmanship, thermal stress, or metal either an architect, a reputable roofing deterioration (both of flashing material itself and contractor, or a craftsman familiar with the of the fasteners). With many roofing materials, inherent characteristics of the particular roofing the replacement of flashing on an existing roof system involved. These professionals may be is a major operation, which may require taking able to advise on immediate patching procedures up large sections of the roof surface. Therefore, and help plan more permanent repairs. the installation of top quality flashing material on a new or replaced roof should be a primary A thorough examination of the roof should start consideration. Remember, some roofing and with an appraisal of the existing condition and flashing materials are not compatible. quality of the roofing material itself. Particular attention should be given to any southern slope because year-round exposure to direct sun may 5.9.3 REPLACING THE HISTORIC cause it to break down first. ROOFING MATERIAL With some exceptions, most historic roofing Support Systems Evaluation: Once the materials are available today. If not, an architect condition of the roofing material has been or preservation group who has previously determined, the related features and support worked with the same type material may be able systems should be examined on the exterior and to recommend suppliers. Special roofing on the interior of the roof. The gutters and materials, such as tile or embossed metal downspouts need periodic cleaning and shingles, can be produced by manufacturers of maintenance since a variety of debris fill them, related products that are commonly used causing water to back up and seep under roofing elsewhere, either on the exterior or interior of a units. Water will eventually cause fasteners, structure. With some creative thinking and sheathing, and roofing structure to deteriorate. research, the historic materials usually can be Although unlikely in north Texas, the daily found. freeze-thaw cycles in winter can cause ice floes to develop under the roof surface. The pressure Replacing Historic Wood Shingles: Wood from these ice floes will dislodge the roofing shingle roofs are important elements of many material, especially slates, shingles, or tiles. historic buildings. The special visual qualities imparted by both the historic shingles and the Many commercial buildings have built-in gutters installation patterns should be preserved when a set within the perimeter of the roof. The wooden shingle roof is replaced. This requires downspouts for these gutters may run within the an understanding of the size, shape, and walls of the building, or drainage may be detailing of the historic shingle and the method through the roof surface or through a parapet to of fabrication and installation. These combined exterior downspouts. These systems can be to create roofs expressive of particular effective if properly maintained; however, if the architectural styles, which were often influenced roof slope is inadequate for good runoff, or if by regional craft practices. the traps are allowed to clog, rainwater will form pools on the roof surface. Interior downspouts Grapevine Design Guidelines – Roof Technical Guidelines 5.9 - 2 Wood shingle roofs need periodic replacement. of the materials, in which case an appropriate They can last from 15 to over 60 years, but the alternative will have to be found. In a shingles should be replaced before there is rehabilitation project, there may be valid reasons deterioration of other wooden components of the for replacing the roof with a material other than building. Appropriate replacement shingles are the original. The historic roofing may no longer available, but careful research, design, be available, or the cost of obtaining specially specifications, and the selection of a skilled fabricated materials may be prohibitive. But the roofer are necessary to assure a job that will decision to use an alternative material should be both preserve the appearance of the historic weighed carefully against the primary concern to building and extend the useful life of the keep the historic character of the building. replacement roof. Commercially available modern shingles and shakes are for the most part If the roof is flat and is not visible from any machine-made. elevation of the building, and if there are advantages to substituting a modern built-up Replacement roofs must comply with local composition roof for what might have been a codes which may require, for example, the use flat metal roof, then it may make better of shingles treated with chemicals or pressure- economic and construction sense to use a impregnated salts to retard fire. These modern roofing method. But if the roof is requirements can usually be met without long- readily visible, the alternative material should term visual effects on the appearance of the match as closely as possible the scale, texture, replacement roof. and coloration of the historic roofing material. Method of manufacture: While commercially Fire-retardant, treated wood shingles are available shakes are promoted by the industry as currently available. The treated wood tends, handsplit, most are split by machine (this however, to be brittle, and may require extra reduces the high cost of hand labor). care (and expense) to install. In some instances, shingles laid with an interlay of fire-retardant Coatings and Treatments: Shingles may be building paper may be an acceptable alternative. treated to obtain a fire-retardant rating; to add a As an alternate, asphalt shingles or ceramic tiles fungicide preservative (generally toxic); to are common substitute materials intended to revitalize the wood with a penetrating stain (oil duplicate the appearance of wood shingles, as well as water based); and to give color. slates, or tiles. Penetrating stains and water repellent sealers are Lead-coated copper, terne-coated steel, and sometimes recommended to revitalize wood aluminum/zinc-coated steel can successfully shingles subject to damage by ultraviolet rays. replace tin, terne plate, zinc, or lead. Copper- Some treatments are oil-borne, some are coated steel is a less expensive (and less waterborne, and some are combined with a durable) substitute for sheet copper.
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