Wood Window Energy Solution!


Drafty Windows? Lack of Energy Efficiency? Loss of Operation? Update your windows to modern standards with this reliable long term solution.

Introducing the Slim Line Insulating Pane | SLIP™

Over 20 years of experience restoring wood windows has made this update come to life. Winterize Windows and make your home more comfortable, with the SLIP™ (Slim Line Insulating Pane). This update is an innovative and cost-effective way to retain your original wood Windows, while making them more efficient, saving you money, and enhancing the comfort of your living space. SLIPs are designed to update single-pane wood windows to modern standards of efficiency and operation. We have made it possible to add an additional TEMPERED pane directly to each sash overlaying your current glass setup. This simple solution can rejuvenate Single hung, double hung, casements, picture windows and more. When SLIPs are added to operating windows, the sash are kerfed and weatherstripped. The weatherstripping helps eliminate drafty windows and also tightens up loose sash in the opening. When we add all these collective updates We call it, the SLIP™ System.  This modernization is a long term solution that does not seasonally need to be reinstalled.

A SLIP™ will dramatically boost insulation power in your windows and will bring great savings to your month to month energy bills.  In terms of insulation power, SLIPs have been tested and are comparable with insulated glass conversions. However, unlike glass conversions, SLIPs will not succumb to seal failure and require periodic glass replacement, meaning lower future maintenance costs.

SLIPs are highly effective, well designed and well-priced, giving you superior value when compared to alternatives. Modern storm windows can be big, bulky and a hassle. SLIPs have a sleek look and feel with a low profile that blend into the sash; you’ll hardly know they are there. Another key aspect is that SLIPs will ensure your window sash remains fully operable, without the need to open two sets of windows as you sometimes get with storm windows. You’ll retain FULL functionality without having to alter your vintage glass.

Some of the benefits of the SLIP:

  • Increased energy efficiency
  • Sound reduction
  • Less expensive than a window replacement!
  • Maintains original window glass
  • Windows can stay historically accurate and functional
  • Solid, well-designed construction and material
  • Interior or exterior install
  • Options of Clear, Obscure, or Low-e
  • Tested and proven product (Click to check out Large Projects)
  • Extremely low future maintenance cost

We understand windows are an extremely rich aspect of a buildings overall feel and character, and the view to the outside world. Our goal is to improve upon this by updating the windows efficiency while keeping the windows true to the look and feel of the building. Learn how the window upgrade products can increase comfort, save money, and provide a positive return on investment by following the link.
Click Here

When attaching the product directly to the sash, it gives the window insulating properties without replacing or altering the original glass. Not only do we believe that SLIPs are a better alternative to the traditional storm window or inserts, we think in many cases they are a favored alternative to insulated glass conversions.

Awning window with SLIP
Vintage Window Weatherstripping


Modern Storms: Unlike modern storms, The SLIP™ fastens to the face of the sash and will act as a permanent fixture/upgrade; with the option of removal if desired. The product attaches to the sash and therefore functions with the sash, no opening two sets of windows to get air; it’s very discreet. To seal around the sash, the SLIP™ system comes with kerf-in weatherstripping. The weatherstripping also helps tighten up the sash in the opening for smoother operation. Since the SLIP™ is not fastened or caulked to the frame, you do you wouldn’t need to have a messy caulking removal, that may rip up siding if you remove.

Inserts: the SLIP™ is fastened to the sash and functions with the sash. No need for installation and removal when you want to open windows. The SLIP™ comes with heat strengthened tempered glass that can act as a security blanket for your windows. When installed on the exterior, the SLIP™ will protect your original glazing from the elements.

Window Replacement:  Replacing your original windows will bring loss in the look of your building and the loss of valuable materials. The green choice is to upgradeTo see all the reasons.. Click Here

Overall…. Upgrading your windows with an insulation product rather than replacement will bring you greater value

“Based on the energy modeling that we did for the building, including live mock ups, the study showed that the SLIPS were very close to the energy performance of the IGU option, and given the lower cost the decision was made to go with the SLIP” -George Bleekman, Owner’s Representative, Capital Design & Facilities Management

Testing performed by Energy Studies in Building Laboratory, Department of Architecture- University of Oregon

Residential Homes

Over 20 years of working with homeowners with vintage windows and encountering problems has motivated us come up with this product. We have listened to vintage homeowners’ problems and concerns with their windows and we took action. Our mission was to create a quality product that would resolve issues such as insulation, noise, functionality and protection all while being aesthetically pleasing at a reasonable price.

There are a couple ways to get SLIPs on your windows-

  1. Buy directly from us for self-install..  CLICK HERE

  2. Have a handyman, window or carpentry contractor install for you

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Historical Preservation

Wood windows and their functional and decorative features are of utmost importance in defining a building’s overall historic character. Our product’s mission is to never jeopardize that, but to improve upon it. Old wood windows are the most valued in the market today and easily outlast modern manufactured wood windows. Vintage windows can have problems such as drafts, low insulation power, and little protection from outside elements. Our SLIP™ product can take care of these issues, while still maintaining your windows’ historical integrity

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Commercial Buildings

SLIPs have successfully been put to use in many commercial buildings and results have been outstanding. Building occupants noticed how much warmer the building is and how much smoother windows operate when letting fresh air in. Building owners will definitely notice the month to month savings in energy bills.

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