Make Your Own Snap-On Window Curtain Panels

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A common problem for anyone living aboard a boat is keeping the heat out during the summer and keeping the heat in during the winter. The problem grows exponentially with larger windows, like those found on trawlers and houseboats that seem to have a built-in convection draft that sucks air right out of the boat. Scroll down to watch remaining videos.
Materials List:
  • Drapery or Shade Fabric
  • Insulation Material (foam packing material or Thermozite)
  • YKK® SNAD® (Plastic on flat surfaces, silicone on curved or uneven surfaces.)
  • Snap Fastener Buttons
  • Snap Fastener Sockets
  • Thread
  • Sunbrella Binding (optional)
Tools List:
  • Marking Tool
  • Measuring Tool
  • Binding Attachment
  • Sewing Machine
  • Snap Fastener Installation Tool

Introduction

Note: This blog was written by Dan Smith, a former Sailrite employee.

Finding the Perfect Insulation Solution

Make Your Own Snap on Window Curtain Panels Video 2

As a liveaboard myself, I've observed several different methods for insulating a window over the years, but none seemed to offer an optimal solution. Standard curtains or drapes provide some relief but are not sufficient on really cold or windy days. Thin cushions, made from 1/2" EnsoLite® foam and sized to fit into the windows, cut down the draft but kill any light coming into the boat and require drilling holes in the interior of the boat for the mechanical fasteners needed to hold cushions in place.

While helping a fellow liveaboard and Sailrite customer, I came up with an effective (and creative!) solution using sheets of random fiber expanded foam packing material (found at any post office). This translucent foam material is a great insulator and is only about 1/16" to 1/8" thick, allowing for more light and less bulk. Watch this video for step-by-step instructions on how to make these window covers.

Step-by-Step Instructions

Use the foam material as a liner between (or behind) panels of drapery or shade fabric (preferably light colors). Covering the panels with fabric on just one side will let more light through, but the window will not have as finished a look when viewed from the outside. Fold the outer edges over twice and sew to create a rubbed seam or bind with a 1" premade binding to finish the edges.

Hang the window panels with adhesive-backed YKK® SNAD® fasteners. A SNAD is a low-profile nylon molded snap component held in place by a high-tech 3M™ adhesive. Install a button snap in all four corners of each panel. Then attach a SNAD stud to each button. Pull the paper backing off the SNADs and adhere directly to a glass, smooth fiberglass or varnished wood surface.

The result is an attractive window cover that provides both insulation and privacy while still letting in quite a bit of light. Your neighbors will be impressed and probably want to know where you got them!

Summer Alternatives

A summer alternative to the foam material is Sailrite's Thermozite material. Thermozite is a very good insulator and also reflects sunlight to keep the heat out when installed with the shiny side facing the window. The obvious drawback is that Thermozite is opaque and will block all light. Use SNADs and snap sockets as described above to hold the panels in place. See this video for instructions on how to make Thermozite Window Covers:

If I were refurbishing my boat, I would create window covers using drapery/shade fabric and create ceiling panels with Thermozite insulation. (Boater lingo is a bit funny as "ceiling" panels refer to the vertical sides on the inside of the hull and "overhead" to the horizontal surface above your head.) Adding Thermozite Insulation to the inside of the hull will help keep the heat in or out when oftentimes the only thing between you and the elements is less than 1/2" of fiberglass.

This clever energy-saving project is simple, and the concept could be applied to window covers and sun shades for homes, RVs and cars.

Thanks, Dan, for coming up with such a great idea!

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