Historic
Historic projects required a careful balance between maintaining architectural integrity and meeting modern performance standards. Manko has developed product lines that focus on preserving those character-defining features, while offering improved thermal performance. These products offer “standard” profiles, however when your project requires custom profiles, Manko is experienced and eager to assist.
Special consideration must be taken when replicating historic windows. In many cases, sightlines, profiles, grid alignment, and surrounding window conditions must match existing to a precise degree. Manko has extensive experience designing products to meet these challenges. Manko has successfully completed numerous projects with state and national historic considerations. Manko can supply a variety of glazing products to best achieve the performance and aesthetic desired.
Replicating a historic window and bringing it to current performance standards requires cutting edge design. Manko utilizes polyamide thermal struts and other innovative design features in our high-performance historic windows to help achieve superior thermal values. Manko believes a window should not only be designed for historic aesthetic expectations but perform as a long-lasting energy efficient solution for the building owner.
Manko’s historic window product lines offer many options to meet design profiles and functionality. Whether you’re looking to replicate steel or aluminum sash, or wood hung windows, Manko has a variety of standard and customizable options. In today’s environment, many projects no longer require ventilation, which has led to the popularity of Manko’s simulated hung, and simulated vent window options.
3100i
Manko’s 3100i series window was designed as a high-performance, solution for replacing historically sensitive steel sash windows. This series’ slimmer face sightlines take into consideration National Park Services (NPS) historic profiles, while delivering superior efficiency over traditional systems with its polyamide thermal barrier.
725i
Manko’s 725i series single hung window was designed with historic wood window profile consideration in mind. The 725i has an optional simulated single hung option with matching sightlines to the true single hung. Custom profiles may be available if needed to better match your projects’ existing windows.
3345i
Manko’s 3345i series offset fixed window was designed with consideration of typical National Park Service (NPS) historic perseveration profiles. This fixed window replicates a single hung and incorporates an energy efficient polyamide thermal strut, giving it the ability to meet most energy codes.
Panning & Interior Snap Trim
Historic projects take into consideration the existing surrounding window conditions. Panning designs aid in the ability to replicate historic profiles. Manko offers an extensive line of standard panning options with custom profile design services available. Numerous interior trim options are available for anchoring and aesthetic purposes.
Painted Finishes
Manko offers AAMA 2605 powder coat painted products. This type of paint offers a finish with superior durability, environmentally responsible considerations, and superior chemical resistance. This finish offers historic projects with masonry façade materials a superior solution.
Insulated Glass
Replacing outdated single pane glass with modern, energy efficient IGUs helps to reduce energy consumption and operating costs. By utilizing passive and solar control low-e glass, renovation projects can achieve exceptional solar management while maintaining high levels of natural light.
Magnolia Headquarters | Waco, Texas
3100i Series Windows
2400i Series Bi-Fold Doors
2450 Series Storefront
100 Series Doors
Guardian Clear SNX 51/23
Memorial Hall | Kansas City, Kansas
725 Series Windows
Guardian MC37
Lee Lofts | Salina, Kansas
3100i Series Windows
2450 Series Storefront
150H Series Doors
Guardian Clear SN68
SMU Smith & Perkins Residence Hall | Dallas, Texas
250 Series Curtain Wall
Guardian UltraClear SNX 62/27
3345i Series Windows
150H Series Doors
Lowe & Campbell | Kansas City, Missouri
3100 Series Windows
700 Series Windows
2450 Series Storefront
135 Series Doors
Vitro Clear Solarban 60
Kansas State University - Anderson Hall | Manhattan, Kansas
3345i Series Windows
Guardian Clear SNX 62/27
While commercial clear float glass is often described as colorless, it naturally exhibits a slight green or blue-green tint. For applications requiring maximum color neutrality, low-iron glass should be considered. Many laminated interlayers block ultraviolet light and may also slightly reduce visible light transmission, which can result in a subtle yellow appearance—particularly in thicker laminates or multi-ply constructions. When low-emissivity (low-e) or reflective coatings are incorporated into laminated glass, placing the coating in contact with the interlayer can alter its refractive index, potentially causing a perceived color shift. As a result, a coating may appear differently in a laminated assembly than in an insulated glass unit.
Optical distortion—both reflected and transmitted—may result from heat treatment, glass thickness variability, framing system stresses, and changes in exterior wind or interior building pressures. Laminated glass assemblies often incorporate multiple plies of heat-treated glass to meet performance requirements. Inherent characteristics of heat-treated glass include bow, roll wave, and picture-frame distortion. While fabricators take steps to minimize these effects, they cannot be eliminated. Distortion is further accentuated when reflective coatings or tinted substrates are used. Manko strongly recommends evaluating a full-size mock-up under actual project conditions.
Under certain lighting or viewing conditions, laminated glass may exhibit iridescent patterns or dark shadowing, commonly referred to as strain patterns or anisotropy. These patterns are caused by stresses introduced during the heat-treatment process and are inherent to heat-treated glass. While typically not visible, strain patterns may become more pronounced at extreme viewing angles or under polarized light. Thicker laminated assemblies may increase the visibility of these patterns. This phenomenon is not indicative of discoloration or material inconsistency.
Due to the technical complexity of laminated glazing systems, early collaboration between design professionals, fabricators, and suppliers is essential. Understanding the construction and inherent characteristics of laminated glass is critical to achieving optimal performance in safety, security, hazard resistance, and acoustic applications. As laminate thickness and ply count increases, the potential for optical distortion also increases. Full-size mock-ups are strongly recommended to evaluate appearance under project-specific lighting, environmental, and viewing conditions, particularly in applications involving visual movement behind the glass.
