03-09-2020 Agenda Packet - Laserfiche WebLink

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in the wall cavities.While the original siding may have the ability to be repaired and made impermeable,it likely will not withstand removal to clean the wall cavities and reinstallation.Staff accepts that the original siding is deteriorated beyond repair. Group B Standards discourage the covering or alteration of original materials with additional siding.If the historic material cannot be repaired because of the extent of deterioration or damage,the preferred treatment is replacement in kind with the same material,wood shiplap in this case.Because this approach is not always feasible,provisions are made in Group B Standards to consider the use of a substitute material if it is of the same material as the original,in the same size and texture. The Standard does provide for an alternative material if it duplicates the original,however,the proposed PVC wood simulated siding is not of the same material as the original,is not in the same size(width of the clapboards is scaled up without a shiplap edge)or texture(embossed wood graining,intended to simulate the texture of wood,is not characteristic of real wood siding and is visually inappropriate).The proposed PVC product is not a familiar replacement product;this may in fact be the first application before this Commission.There is precedent for engineered wood products such as HardiePlank and LP SmartSide, as well as traditional vinyl siding,all having a shiplap style option. Applicants have submitted comparison quotes for Celect,cedar siding,vinyl siding,original siding repair,and another for new wood.Below is a summary of the costs for the materials and for painting(where applicable). Celect PVC siding cedar siding vinyl siding–Big C repair original siding tongue&groove Kimmel siding-Mastercraft 11,230 60,970 2,796.55 23,000 16,170 Staff has requested more detail about the plan to repair/replace the trim around the windows and at the roof gable to"closely match the original"–specifically which architectural details and what the material will be. The National Park Service Preservation Brief#8 Aluminum and Vinyl Siding on Historic Buildings:The Appropriateness of Substitute Materials for Resurfacing Historic Wood Frame Buildings was consulted for this staff report. SITE VISIT REPORT:N/A STANDARDS AND GUIDELINES:Group B The Commission has the authority to determine the architectural merits and the extent of any proposed treatment, renovation,or addition to a historic landmark. The commission will require drawings,plans,specifications,and/or samples where appropriate. A. Maintenance The maintenance of any historical structure or site shall in no way involve any direct physical change except for the general cleaning and upkeep of the landmark. The Commission shall encourage the proper maintenance of all structure or sites. B.Treatment Treatment shall be defined as any change of surface materials that will not alter the style or original form. Such improvements include re-roofing,glazing,or landscaping lawns and may involve a change that can potentially enhance or detract from the character of the landmark. A treatment change of any surface whether on the landmark or in its environment may require a Certificate of Appropriateness if it significantly alters the appearance of the landmark. Although these kinds of changes may not require a Building Permit,a Certificate of Appropriateness may be necessary. The commission should review the proposed treatment for character and style consistency with the original surfaces. C.Renovation and Additions Renovation is the modification of a structure,which does not alter the general massing while an addition,is a change in mass. A modification,which involves the removal of a part of the landmark,should be considered under demolition(see demolition). Additions to landmarks should not detract from the original form and unity of the landmark and should not cover singular examples of architectural detail. Additions to landmarks should be added in a manner that does not disrupt the visible unity of overall appearance of the site. The proportions,materials and ratios of the existing structures should be carried through in the additions. Care should be taken not to change or alter the following: 1.Structure—Necessary structural improvements,where safety demands should be accomplished in such a way as to cause minimal visual change to the original style and construction. 2.Material—Additions and improvements involving any new material in the landmark should be of the same material as the original. It should be the same size and texture. An alternative material may be allowed if it duplicates the original. a.wood—all wood trim should conform with existing trim in shape and size. b.siding materials—the Commission discourages the covering or alteration of original materials with additional siding.Structures already sided with incompatible materials should be returned to a siding similar to the original when renovation is considered. D.Demolition Historic landmarks shall not be demolished. When a landmark poses a threat to the public safety,and demolition is the only alternative,documentation by way of photographs,measured drawings,or other descriptive methods should be made of both the