After your purchase, you will receive access to video tutorials of the installation process. In the order file in your customer portal you will also find the sales contract, warranty information and an installation index.  You can use to match up the different delivered components to your different window types.

How To Properly Measure Your Windows for a SLIP™

The first step in ordering the Slim Line Insulating Pane(SLIP™) system is providing us with an accurate measurement. This is potentially the most important step in the SLIP™ process.  It allows us to build and provide you with a properly fitted product.  It will look and perform optimally for many years.

NOTICE: You only Need to Measure for SLIPs if you intend to Install yourself

‘Daylight Size’

The measurement required is what we call the “Daylight Size”. It is essentially the overall measurement of the width and height of where the glass meets the wood, both width and height. We understand that there are many types of vintage sash with a variety of glass configurations; However, the process for obtaining the daylight measurement is identical regardless of the sash/glass setup.

Butt your tape measure to the edge of the sash where it meets the far outside edge of the outermost glass pane (for multilight configurations).  Or where the profile edge of the sash meets the outside edge of a single light sash configuration. While holding the tape measure end to this point, drag the tape measure all glass panes for multi-light configuration.  Or across the entire pain for single light configurations and read the measurement at the same point on the opposite side of the sash. For the majority of vintage sash, this measurement ends with the fraction 5/8”, but this is not always the case. The same process is repeated for the daylight height. It is essential that the first measurement we receive is width, followed by height. These measurements ultimately decide the shape and size of each SLIP™ as well as the hidden balance type for double hungs.

For Double Hung windows, this process needs to be repeated for both top and bottom sash.  They are not always the same size. Repeat this process for all windows you wish to order and install the SLIP™.


NOTE(out of square/sagging windows):

Sometimes windows or sash may out of square. SLIPs can still be installed on an out of square sash. When the sash is out of square you’ll notice that the daylight will be different measurements at different sections of the sash. You must take the largest measurement you get from the daylight in order for your SLIP to fit over the entirety of the glazing. If you requested weatherstripping, we use 1/8″ weatherstripping. The weatherstripping wont be as effective if a 1/8″ gap around the sash  and the frame doesn’t exist.

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