RetroWAL Interior Curtainwall Retrofit System

RetroWAL™: the World's First Do-It-Yourself Commercial Window Retrofit System

Made in the USA, RetroWAL™ is the single most affordable and effective solution for improving energy performance in curtain wall, storefront and window wall buildings. Unlike traditional re¬placement windows, RetroWAL™ installs quickly and easily on the interior of a building’s existing windows, creating an insulating dead air space. The existing glass stays in place, eliminating the need for costly scaffolding or intrusive downtime. Available in both Silver and Gold Series, RetroWAL™ reduces a building’s energy consumption by an average of 20%. The Silver Series uses monolithic low-e glass to convert single pane windows to double pane, while the Gold Series upgrades a single pane window to triple pane with low-e, argon-filled glass. Both the Silver and Gold Series improve building insulation, reduce solar heat gain and air infiltration, and provide effective sound control buildings.



Everyone wants to cut energy costs, but most energy system upgrades don’t provide an attractive ROI. RetroWAL™ is an interior window retrofit that makes improving your building’s energy performance financially viable.>READ MORE
Efficiency Retrowal


One of the greatest contributors to energy consumption in curtainwall buildings - especially those with large window-to-wall ratios - is poor insulation. Studies show that glass contributes to 50% of the total building load in cold climates.>READ MORE
Comfort RetroWAL


RetroWAL™ not only significantly improves energy performance, but also increases comfort for tenants and building occupants. Older glass façade buildings often have laboring HVAC systems and leaky windows, which results in hot and cold spots. >READ MORE


The National Park Service sets the guidelines for historic buildings. RetroWAL™ easily meets all historic preservation guidelines, which can be one of the biggest challenges when it comes to improving the energy efficiency of historic buildings. >READ MORE

About RetroWAL™

Curtainwall, storefront and window wall systems have been utilized since the 1950s. They consist of non structural tubular aluminum and have non protective glazings. Most all systems built before 1975 have non insulating frames and single pane glass, making buildings perform at less than an R=1 for the exterior. Try building a home today with this insulation value and it wouldn’t be allowed, yet more than 53% of all commercial building windows today perform at this low level. New energy and security requirements necessitate the need for upgrades to these structures, but it has been too expensive to change the glass exteriors of many of these buildings - until now. RetroWAL™ utilizes a “Window Attachment Lite” or WAL®, which is attached to the existing window frame from the interior, thereby creating an insulating airgap and replicating the performance of a new curtainwall. It will triple the energy performance of the window insulation, reduce air infiltration and limit solar heat gain- all for a fraction of the cost of a replacement curtainwall. Buildings

Types of Buildings that Benefit the Most from RetroWAL™

RetroWAL for High Rises


In many cases of buildings from the Mid-Modern Era, 1958-1973, insulated glass and thermally broken curtain wall is too heavy to be hung on the existing structure so the “modern” glazing option is not possible. RetroWAL™ places another glass lite beh
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RetroWAL for Offices


Office building owners typically never consider a window replacement a very good investment simply because of the high cost to replace – especially in large cities.  Not only are modern, insulated glass windows expensive but the labor to install thes
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RetroWAL for Hotels


Behind labor, utilities represent the largest variable cost to the hotel operator. The cost of replacing older, inefficient windows can be out of the budget and can change the architectural integrity of the building. Reduction of noise from street tr
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RetroWAL for Apartment Conversions

Apartment Conversions

Today, many downtown areas are being rejuvenated with new restaurants and cool urban atmosphere but the problem is limited condominiums and apartments.  Older office buildings that have been downsized are being redeveloped into homes but the window s
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How Architects, Contractors, Building Owners and ESCOs Benefit from RetroWAL™

RetroWAL for Architects


We are specified in situations where historic tax credits are important and in situations where budget, weight, tenant movement and security are issues. We are well known by leading architects in New York, Chicago, and Washington, DC and will provide
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RetroWAL for Owners


Once building owners find out about the RetroWAL™ option, see the pricing and see the product in their building- they buy it. We understand that this product is difficult to conceptualize so we begin our discussion with owners on price, Return on Inv
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RetroWAL for Contractors


In many cases where new security curtainwall is specified, RetroWAL™ solves the problem faster and typically 50% under budget.  General contractors use the product when budgets become an issue and where Value Engineering options are considered.
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RetroWAL for ESCOs


We work with many of the largest Energy Service Contractors in the world by helping them modernizing both federal and private building envelopes. It is not unusual to have 5,000 or more windows on a single and be part of a project to save over 50% of
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