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    To reach more people with this great product, we now sell ready-to-install custom SLIP contractor kits.

    These kits are great for installation by the contractor or handyman of your choice. For home owners with exceptional carpentry skills and the appropriate tools, you may be able to install SLIP kits yourself. Installing SLIPs on your windows can be a great DIY home improvement project to increase the comfort and performance of your house. We recommend that you review the step-by-step video that explains installation on multiple window types with your contractor to confirm that SLIPs are the best option for your home. Once we receive measurements, we cut, label and pack the materials needed for your home and then ship the custom installation kits directly to your contractor or your home.

    We are only quoting and selling to contractors at this time. Unfortunately, we do not yet have a network of installers, you must find a contractor in your area who can install for you. The best installers are:

    • Window Restoration contractors
    • Glaziers
    • Remodelers
    • Carpenters
    • Handyman

    Are your windows right for SLIPs?

    SLIPs are a great product for square/rectangular wood windows. SLIPs are designed to cover the whole surface of the original window glass, which works best with the straight lines of square / rectangular windows.

    If you wish to install SLIPs on the interior, CLICK HERE and search the Insallation FAQs.

    Do You Have The Skills?

    Woodworking and technical skills are needed to take on this project successfully. Installing SLIPs on a fixed window is relatively simple. Installing SLIPs on a single-hung or double-hung window is a lot more complex and requires more steps. While we recommend that you select a contractor or installer to assist with the installation of SLIPs, if you have top-notch construction or carpentry skills, it is possible to install SLIPs as a DIY project.

    Fixed Windows – Installing a SLIP™ on a fixed window is a relatively simple job and involves cleaning and prepping the window before installing the SLIP.


    • Operating Casement Windows (French Casements, Awnings, Hoppers, etc.) – If weatherstripping is not needed, this will be similar to the fixed window install. We recommend weatherstripping to benefit the whole SLIP system by using our provided kerf in weatherstripping. Doing this involves removing the sash and kerfing four sides of the operating window. The process may also involve measuring and planing the sides of the sash.
    • Double- / Single-Hung Windows These are the most complex and have the most steps for a successful installation. Installing this type of window requires the removal of the window sash and reassembling. Adjusting the counterbalance weight will also be necessary to account for the additional weight on the sash; spring balances or ropes/weights can be used. Yes, you can use ropes! We offer balances when ordering the SLIP™ Kit because there are more unknown variables to calculate when using ropes. Also, shipping dense lead weights increase shipping costs dramatically.



    All components are ordered, made, and assembled to the custom sizes provided by the customer and calculated weights.

    • SLIPs
    • Hidden balances
    • Weatherstripping (vinyl & bulb)
    • Screws & tabs


    If you feel like you’re equipped with the necessary skill set and tools, follow these steps! For most, this process will require the assistance of a contractor or installer to complete properly.


    1) Measurements
    Get the daylight measurement of your windows. All materials are custom-made to your declared specifications. Therefore, they must be precise.

    Click Here to learn how too measure.

    2) Request a Quote
    Click Here to fill out the quote form with your window specifications. 

    3) Review
    Receive the quote, and review it to make sure everything is accurate and accounted for. We recommend that you review the quote with your contractor or installer.

    4) Ordering
    Order the SLIP™ Kit through our online customer portal. When you place your order, 50% of the estimate is required. The remaining 50% is required when the order is ready to ship.

    5) Make Room
    SLIP™ kits arrive in crates. Depending on the order, crates can be heavy and large. Crates will be bigger than the largest height and width given in your measurements. Crates are shipped less than truckload (LTL) and space available to unload and store the kits on delivery.

    6) Wait in Anticipation
    All products are custom-made. We will give you an estimated arrival date for your shipment. SLIPs can take approximately 4-6 weeks to arrive after the order is placed.


    Reach out & we’ll answer any questions you have to help you get started.

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