Loading...
HomeMy WebLinkAbout+Design Guideline Worksheet WHO District City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION Commission WAREHOUSE HISTORIC DISTRICT DESIGN STANDARDS GENERAL DESIGN GUIDELINES MEETS DOES NOT COMMENTS PRIMARY FACADES MEET Many of the Warehouse Historic District’s buildings possess components traditionally seen on industrial buildings. The repetition of these standard elements creates a visual unity at the street that should be preserved. 3.1 For a warehouse building, a rehabilitation project should preserve these character-defining elements:  Man-door: A small door for use by people entering the building. These can be similar in character to a storefront on a retail building. They often include a transom.  Windows: Windows located at the street level. These often are larger and display a similar pattern to the upper story windows.  Upper-story windows: Windows located above the street level. These usually have a vertical orientation.  Cornice molding: A decorative band at the top of the building.  Cultural and civic structures are allowed to have ‘pride of place’ with setbacks and form differences, while maintaining compatible human scale. elements at street level.  Loading dock: A raised landing for handling goods; some project from the facade while others are inset behind the building plane.  Loading bay doorway: A large opening at the landing dock. Typically, these are rectangular, although sometimes arched. Rolling overhead or horizontal sliding doors were used in these openings. Singular and multiple openings were found on walls.  Canopy: A metal structure usually sheltering the loading dock. Some were horizontal and others were sloped. They were supported on metal and heavy timber supports that were wall mounted. 3.2 Preserve the historic character of the building facade.  Preserve loading docks, loading bay openings, windows and door frames.  If the glass is intact, it should be preserved. 3.3 If the facade is altered, restoring it to the original design is preferred.  If evidence of an original design component is missing, use a simplified interpretation of similar components in the area. City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission MEETS DOES NOT COMMENTS PRIMARY FACADES MEET Historic photographs of Twin Falls and its industrial buildings are available and should be used when determining the original character of the facade. 3.4 Alternative designs that are contemporary interpretations of traditional industrial buildings may be considered where the historic façade is missing and no evidence of it exists.  Where the original is missing and no evidence of its character exists, a new design that uses the traditional elements may be considered. However, the new design should continue to convey the character of typical facades in the area, including the repetitive window patterns and openings seen along the building fronts. 3.5 Preserve the character of the cornice line.  Most historic commercial buildings have cornices to cap their facades. Their repetition along the street contributes to the visual continuity on the block.  Many cornices are made of sheet metal, which is fairly lightweight and easy to repair. Areas that have rusted through can be patched with pieces of new metal. 3.6 Reconstruct a missing cornice when historic evidence is available.  Use historic photographs to determine design details of the original cornice.  Replacement elements should match the original in every detail, especially in overall size and profile. Keep sheet metal ornamentation well painted.  The substitution of a new cornice for the original may be considered, provided that the substitute is similar to the original.  3.7 A simplified interpretation is also appropriate for a replacement cornice if evidence of the original is missing.  Appropriate materials include stone, brick and stamped metal. 3.8 Retain the original shape of the transom glass in existing openings  Transoms, the upper glass band on door openings, introduced light and air circulation into the depths of the building, saving on light and cooling costs. These bands should not be removed or enclosed. MEETS DOES NOT COMMENTS PRIMARY FACADES MEET  The shape of the transom is important to the City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission proportion of the opening, and it should be preserved in its historic configuration  If the transom must be blocked out, be certain to retain the original proportions. One option might be to use it as a sign panel or decorative band. 3.9 A parapet wall should not be altered, especially those on primary elevations or highly visible walls.  When a parapet wall becomes deteriorated, there is sometimes a temptation to lower or remove it. Avoid doing this because the flashing for the roof is often tied into the parapet, and disturbing it can cause moisture problems  Inspect parapets on a regular basis. They are exposed to the weather more than other parts of the building, so watch for deterioration such as missing mortar or excessive moisture retention.  Avoid waterproofing treatments which can interfere with the parapet’s natural ability to dry out quickly when it gets wet.  A parapet wall should not be altered, especially those on primary elevations or highly visible walls. MEETS DOES NOT COMMENTS ARCHETECTURAL DETAILS MEET Architectural details contribute to the character of a structure. Specific types of details are associated with specific architectural styles. Select an appropriate treatment that will provide for proper preservation of significant features. The method that requires the least intervention is preferred. See Chapter II for information on identifying key features of specific styles, and for determining appropriate treatment strategies for them. 3.10 Preserve significant stylistic and architectural features.  Doors, windows, cornices, loading docks, loading bay doorways, and canopies are examples of architectural features that should be preserved.  Employ preventive maintenance measures such as rust removal, caulking and repainting.  Do not remove or alter architectural details that are in good condition or that can be repaired. 3.11 Repair deteriorated features.  Patch, piece-in, splice, consolidate or otherwise upgrade existing materials, using recognized preservation methods  Isolated areas of damage may be stabilized or fixed using consolidates. Epoxies and resins may be considered for wood repair. MEETS DOES NOT COMMENTS  ARCHETECTURAL DETAILS MEET  Removing a damaged feature that can be City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission repaired is not appropriate.  Protect significant features that are adjacent to the area being worked on. 3.12 When disassembly of a historic element is necessary for its repair, use methods that minimize damage to it.  When removing a historic feature, document its location so it may be repositioned accurately. 3.13 Use technical procedures for cleaning, refinishing and repairing an architectural detail that will maintain the original finish.  Use the gentlest means possible that will achieve the desired results  Employ treatments such as rust removal, caulking, limited paint removal and reapplication of paint or stain where appropriate. 3.14 When reconstructing an element is impossible, develop a new design that is a compatible interpretation of it.  The new element should be similar to comparable features in general size, shape, texture, material and finish. 3.15 Replace an architectural element accurately.  The design should be substantiated by physical or pictorial evidence to avoid creating a misrepresentation of the building’s history.  The design should be substantiated by physical or pictorial evidence to avoid creating a misrepresentation of the building’s history.  Use the same kind of material as the original when feasible. However, a substitute material may be acceptable if the size, shape, texture and finish conveys the visual appearance of the original. Alternative materials are usually more acceptable in locations that are remote from view or direct contact.  Restore altered window openings on primary walls to their original configuration, when feasible. 3.16 Avoid adding details that were not part of the original building.  For example, decorative millwork should not be added to a building if it was not an original feature. Doing so would convey a false history and would not be appropriate for the traditionally simple character of most warehouse buildings. MEETS DOES NOT COMMENTS MATERIALS & FINISHES MEET Primary historic building materials should be preserved in place whenever feasible. If the material is damaged, then limited replacement which matches the original should be considered. These materials should never be covered or subjected to harsh City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission cleaning treatments. Preserving original building materials and limiting replacement to only pieces which are deteriorated beyond repair reduces the demand for, and environmental impacts from, the production of new materials and thus is sound sustainability policy. Primary historic building materials found in Twin Falls include wood, stone, brick, metal, stucco, plaster and concrete. These guidelines apply to all such materials: 3.17 Preserve original building materials.  Avoid removing original materials that are in good condition.  Remove only those materials which are deteriorated, and must be replaced.  Masonry features that define the overall historic character, such as walls, cornices, pediments, steps and foundations, should be preserved.  Avoid rebuilding a major portion of exterior masonry walls that could be repaired. 3.18 Repair deteriorated primary building materials.  Repair by patching, piecing-in, consolidating or otherwise reinforcing the material. 3.19 When replacing materials on primary surfaces, match the original material in composition, scale and finish.  If the original material is wood clapboard, for example, then the replacement material should be wood as well. It should match the original in size, the amount of exposed lap and in finish.  Replace only the amount required. If a few boards are damaged beyond repair, then only they should be replaced, not the entire wall  If a wood porch or deck floor needs replacement because of significant deterioration, a substitute material may be considered in this case. Recycled materials may be an appropriate replacement material to consider. 3.20 Do not use synthetic materials, such as aluminum, vinyl or panelized brick, as replacements for primary building materials.  Primary building materials, such as wood siding and masonry, should not be replaced with synthetic materials.  Modular materials should not be used as replacement materials. Synthetic stucco and panelized brick, for example, are inappropriate.  In some instances, substitute materials may be used for replacing architectural details. If a new material is used, its style and detail should match the historic model. MEETS DOES NOT COMMENTS MATERIALS & FINISHES MEET City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission  Green building materials, such as those made with renewable and local resources, may be considered for replacement materials where they are compatible with the historic building and context. 3.21 Covering original building materials with new materials is inappropriate.  Vinyl siding, aluminum siding and new stucco are generally inappropriate on historic buildings. Other imitation materials that are designed to look like wood or masonry siding, fabricated from other materials, are also inappropriate.  If a property already has a non-historic building material covering the original, it is not appropriate to add another layer of new material, which would further obscure the original. 3.22 Consider removing later covering materials that have not achieved historic significance.  Once the non-historic siding is removed, repair the original, underlying material.  If a structure has a stucco finish, removing the covering may be difficult, and may not be desirable. Test the stucco to assure that the original material underneath will not be damaged. MEETS DOES NOT COMMENTS PAINT MEET Historically, most wood surfaces on the exterior of a building were painted to protect them from weathering. Concrete and stucco structures also were sometimes painted. 3.30 Plan repainting carefully.  Always prepare a good substrate. Prior to painting, remove damaged or deteriorated paint only to the next intact layer, using the gentlest means possible.  Use compatible paints. Some latex paints will not bond well to earlier oil-based paints without a primer coat. 3.31 Using the historic color scheme is encouraged.  Paint scrapping in shaded areas result in accurate historic color samples.  If the historic scheme is not known, then an interpretation of schemes on similar historic buildings is appropriate.  Generally, one muted color is used as a background, which unifies the composition  One or two other colors are usually used for accent to highlight details and trim.  Brilliant luminescent and day-glow colors are inappropriate. City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission  High gloss paints and finishes are inappropriate. TREATMENT OF INDIVIDUAL BUILDING FEATURES MEETS DOES NOT COMMENTS DOORS MEET The character-defining features of a historic door and its distinct materials and placement should be preserved. This includes both a man-door and a loading bay door. When a new door is needed, it should be in character with the building. This is especially important on primary facades. 3.32 Preserve the decorative and functional features of a primary entrance.  These include the door, door frame, threshold, glass panes, paneling, hardware, detailing, transoms and flanking sidelights.  Avoid changing the position of an original front door. 3.33 Preserve a loading bay door.  Avoid changing the position of an original loading bay door. 3.33 Preserve a loading bay door.  Avoid changing the position of an original loading bay door.  Where replacement is needed, the design should have an appearance similar to the original, and be in character with the building  Maintain the proportions of the original opening and door(s). 3.34 Maintain the original proportions of a historically significant door.  Altering the original size and shape of a historic door is inappropriate. 3.35 When a historic door is damaged, repair it and maintain its general historic appearance. 3.36 When replacing a door, use materials that appear similar to that of the original. 3.37 When replacing a door, use a design that has an appearance similar to the original door, or a door associated with the building style or type. MEETS DOES NOT COMMENTS WINDOWS MEET The character-defining features of a historic window, its distinct materials and its location should be preserved. When necessary, a replacement window should be in character with the historic building. 3.38 Preserve the functional and decorative features of a historic window.  Features important to the character of a window include its frame, sash, muntins, mullions, glazing, sills, heads, jambs, moldings, operation and groupings of windows. See the diagrams for an illustration of window features.  Repair frames and sashes rather than replacing them, whenever possible. City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission  Window awnings may be used and should be compatible with the building. 3.39 Preserve the position, number and arrangement of historic windows in a building wall.  On primary facades, enclosing a historic window opening is inappropriate, as is adding a new window opening. 3.40 Preserve the historic ratio of window openings to solid wall on a primary facade.  Significantly increasing the amount of glass on a character-defining facade will negatively affect the integrity of the structure. MEETS DOES NOT COMMENTS WINDOWS MEET 3.41 Preserve the size and proportion of a historic window opening.  Reducing an original opening to accommodate a smaller window or increasing it to receive a larger window is inappropriate. 3.42 Match a replacement window to the original in its design.  If the original is double-hung, then the replacement window should also be double- hung or appear to be so. Match the replacement also in the number and position of glass panes  Matching the original design is particularly important on key character-defining walls. 3.43 In a replacement window, use materials that appear similar to the original.  New glazing should convey the visual appearance of historic glazing.  Using the same material as the original is preferred, especially on character-defining walls. However, a substitute material may be considered if the appearance of the window components will match those of the original in dimension, profile and finish.  Transparent low-e type glass is appropriate  Vinyl and unfinished metals are inappropriate window materials. 3.44 Match, as closely as possible, the profile of the sash and its components to that of the original window.  A historic wood window usually has a complex profile. Within the window’s casing, the sash steps back to the plane of the glazing (glass) in several increments. These are important details. 3.45 Convey as closely as possible the character of historic sash divisions in a new window.  Muntin’s that divide a window into smaller panes of glass should be genuine on key walls City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission and other highly visible places.  Strips of material located between panes of glass to simulate muntins are inappropriate. MEETS DOES NOT COMMENTS ROOFS MEET The character of a historic roof should be preserved, including its form and materials, whenever feasible. 3.47 Preserve the original roof form of a historic structure.  Avoid altering the angle of a historic roof. Instead, maintain the perceived line and orientation of the roof as seen from the street. 3.48 Preserve the original eave depth of a roof.  The shadows created by traditional overhangs contribute to one’s perception of the building’s historic scale and therefore, these overhangs should be preserved. Cutting back roof rafters and soffits or in other ways altering the traditional roof overhang is inappropriate. 3.49 Preserve original roof materials.  Avoid removing historic roofing material that is in good condition.  Also preserve decorative elements, including crests and chimneys.  Retain and repair roof detailing, including gutters and downspouts. 3.50 New roof materials should convey a scale and texture similar to those used traditionally.  When choosing a roof replacement material, the architectural style of the structure should be considered.  Composition shingle roofs are generally appropriate replacements for wood shingles. They should have a color similar to the original, or of the material in weathered condition.  Shingles that contain embedded photovoltaic systems are also appropriate in dark colors. MEETS DOES NOT COMMENTS ROOFS MEET  Specialty materials such as tiles should be replaced with a matching material. 3.51 If metal roof materials are to be used, they should be applied and de tailed in a manner compatible with the historic character.  Metal roof materials should have a matte, non- reflective finish.  Seams should be of a low profile  The edges of the roofing material should be finished similar to those seen historically. 3.52 Avoid using conjectural features on a roof.  Adding a widow’s walk (an ornate railing around City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission the roof ridge) on a house where there is no evidence one existed creates a false impression of the home’s original appearance, and is inappropriate. 3.53 Minimize the visual impacts of skylights and other rooftop devices.  A skylight that is flush with the roof plane may be considered where it remains visually subordinate.  Skylights should not interrupt the plane of the historic roof, and should be located below the ridgeline.  Locate electronic data transmission and receiving devices to minimize impacts to the extent feasible.  See page 85 for guidance related to roof- mounted solar panels. MEETS DOES NOT COMMENTS AWNINGS MEET Traditionally, fabric awnings were noteworthy features on residential, commercial and industrial buildings in the district, and their continued use is encouraged. These were simple in detail, and reflected the character of the building to which they were attached. Operable awnings helped to moderate building temperatures and light conditions. Continue the use of awnings within the district. They should be compatible with the building type and style, and be located appropriately on the building. 3.54 A fabric awning is encouraged.  Historically, fabric awnings were most commonly found on commercial buildings.  Operable awnings are encouraged, but rigid frame types may also be considered.  Installing an operable awning is preferred because it can be an energy efficient mechanism for managing interior light and air. (See the illustration at the right.)  3.55 An awning should be in character with the building.  Mount an awning to accentuate character- defining features. In most cases, the awning should fit within the opening of the window or door.  Use colors that are compatible with the overall color scheme of the facade. Solid colors are encouraged  Simple shed shapes are appropriate for rectangular openings. Odd shapes, bullnose awnings and bubble awnings are inappropriate  Internal illumination of an awning is inappropriate  An awning should remain a subordinate feature on the facade. MEETS DOES NOT MEET COMMENTS COLOR Traditionally in the Warehouse Historic District materials were left exposed, and color schemes were relatively muted. A single City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission base color was applied to the primary wall plane. Then, one or two accent colors were used to highlight ornamental features, as well as trim around doors and windows. Since many of the structures were brick, the natural color of the masonry became the background color. Sometimes a contrasting masonry was used for window sills and moldings. As a result, the contrast between the base color and trim was relatively subtle. These traditions of using exposed materials, limited numbers of colors, and muted ones, should be continued. These guidelines do not specify which colors should be selected, but rather how they should be used. 4.37 The facade should “read” as a single composition.  Employ color schemes that are simple in character.  Using one base color for the building walls and another for the roof is preferred.  Using one to three accent colors for trim elements is also preferred.  4.38 Base or background colors should be muted.  Building features should be muted, while trim accents can be either a contrasting color or a harmonizing color.  An accent color should not contrast so strongly as to not read as part of the composition.  Bright high-intensity colors are not permitted.  Use matte or low luster finishes instead of glossy ones.  Generally, non-reflective, muted finishes on all features is preferred. 4.39 Building elements should be finished in a manner similar to that seen traditionally. The following are recommended treatments:  Brick and stone: unpainted, natural color  Window frames and sash, doors and frame and storefronts: painted wood; anodized metal or baked color.  Wood siding: painted  In most cases, highly reflective materials, weathered wood and clear finishes are inappropriate on large surfaces. A clear finish is appropriate on a wood entry door. MEETS DOES NOT MEET COMMENTS BUILDING LIGHTING The character and level of lighting that is used on a building is of special concern. Traditionally, exterior lights were simple in character and were used to highlight signs, entrances, and first floor details. Most fixtures had incandescent lamps that cast a color similar to daylight, were relatively low intensity and were shielded with simple shade devices. Although new lamp types may be considered, the overall effect of modest, focused, building light should be continued. When installing architectural lighting on a historic building, use existing documentation as a basis for the new design. If no documentation exists, use a contemporary light fixture. Building lighting should be installed in a manner so as not to damage the historic fabric of the building and should be reversible. Most historic lighting was subdued and directed at signs, entrances and building features. 4.43 Use lighting to accent:  Building entrances  Signs 4.44 Minimize the visual impacts of architectural lighting.  Use exterior light sources with a low level of City of Twin Falls Historic CERTIFICATE OF APPRORIATENESS ACTION SHEET Preservation APPLICATION PZ19-00## Commission luminescence  Use white lights that cast a similar color to daylight.  Do not wash an entire building facade in light.  Use lighting fixtures that are appropriate to the building and its surroundings in terms of style, scale and intensity of illumination. 4.45 Use shielded and focused light sources to prevent glare.  Provide shielded and focused light sources that direct light downward.  Do not use high intensity light sources or cast light directly upward.  Shield lighting associated with services areas, parking lots and parking structures.