Can You Make Your Own Double Pane Window? The Ultimate DIY Guide

Double pane windows can greatly enhance your home‘s energy efficiency and comfort. The air trapped between the two panes of glass acts as insulation, reducing heating and cooling costs. While professional installation is ideal, it is possible to make your own double pane windows with the right materials and techniques. This comprehensive DIY guide will provide everything you need to know to create effective homemade double pane windows.

Benefits of Double Pane Windows

Double pane windows offer homeowners a variety of benefits:

• Improved insulation – The air gap between panes reduces conductive heat transfer, keeping interior air temperate. This helps keep your home warmer in winter and cooler in summer. According to the Department of Energy, double pane windows can reduce heat loss by up to 50% compared to single pane windows.

• Reduced noise – The air cavity between windows dampens outside noise like traffic or noisy neighbors. This can make a significant difference in noisy areas near busy roads. Double pane windows can lower outside noise by up to 50 decibels.

• Energy savings – Less heat loss means lower heating bills in cold weather. High efficiency windows also reduce the need for air conditioning in summer. Double pane windows can reduce heating and cooling costs by 10-15% per year.

• Reduced condensation – Insulated windows prevent interior air from cooling enough to form condensation or frost on the interior pane. This also improves window durability.

• Enhanced durability – Multiple panes protect against damage and provide better insulation against weather elements like wind, rain, and hail.

Overview of the DIY Double Pane Window Process

Making your own double pane windows involves careful measuring, assembly, sealing, and installation. Follow these general steps:

• Measure window openings precisely to size glass.

• Purchase all necessary materials like glass, glazing compound, putty, etc.

• Carefully cut glass panes to measured sizes if needed.

• Apply glazing compound to seal two panes together into one insulated unit.

• Seal edges completely with glazing putty for an airtight seal.

• Install insulated glass unit securely into window frame.

• Consider low-E coatings or gas fills to further enhance efficiency.

How to Make DIY Double Pane Windows

Follow these more detailed steps to successfully construct and install your own homemade double pane windows.

Measure Window Opening Carefully

Precise measurements are crucial for proper fitting double pane windows:

• Remove existing window if simply replacing the glass.

• Measure height and width precisely from inside edge to inside edge of window frame. Use a high quality metal tape measure for accuracy.

• Account for the window frame thickness on all sides when measuring. Frames commonly range from 1 to 3 inches thick.

• It‘s better to have glass cut slightly small than to be too big. Aim for a gap of 1/8 inch or less for easy sealing.

• For larger windows, take several height and width measurements to account for out-of-square openings.

• Note the measurements for the window shop who will cut the glass.

Purchase Necessary Window Materials

You‘ll need the following materials:

• Glass sheets – Select quality annealed float glass. Get the right thickness for your project – 3/16 to 1/4 inches is common. Tempered glass works for enhanced safety.

• Glazing compound – Used to seal glass panes together into an airtight insulating unit. Look for high quality brands like DAP or OSI. Silicone or latex based compounds work well.

• Glazing points or clips – These small clips secure the two panes together while the glazing compound dries. Brass clips offer high durability.

• Glazing putty tape – The putty tape creates an airtight seal around glass unit edges. Get the right thickness to match your window depth.

• Window trim – Interior wood trim gives a smooth finished look. Pine, poplar, or oak pieces work well.

• Silicone caulk and sealant – Use premium brands like GE for long lasting flexibility and adhesion.

Carefully Cut Glass to Size

Having the glass shop cut your glass is easiest, but you can cut it yourself:

• Score the glass with a specialty cutter applying firm, even pressure along a straight edge.

• Position the scored line just over the edge of a sturdy work table.

• Firmly run a pair of breaking pliers or a dowel along the score line to split the glass cleanly.

• Carefully sand the freshly cut glass edge completely smooth with fine grit sandpaper.

• Wear thick work gloves, long sleeves, and eye protection when cutting glass. Work slowly and gently for safety.

Apply Glazing Compound Between Panes

Let‘s assemble the glass panes into an insulating unit:

• Thoroughly clean and dry both glass sheets first for best glazing compound adhesion.

• Apply a consistent 1/8" bead of glazing compound around the entire inner edge of one glass pane. Keep the bead smooth and uniform.

• Carefully lower the second pane atop the first, gently pressing together sandwiching the glazing compound between.

• Use glazing points or metal clips evenly spaced around the edge to hold glass together tightly while glazing compound dries.

• Allow the compound to fully cure overnight before installing in window frame.

Seal Edges with Glazing Putty

Next, seal the edges for an airtight unit:

• Once glazing compound has dried, run a rope of glazing putty tape all the way around the glass unit edge.

• Press putty into any gaps, smoothing with a putty knife for a seamless seal.

• After putty dries per manufacturer instructions, trim any excess with a sharp utility knife for a tidy finish.

• The putty tape provides insulation and prevents air leaks, moisture, and dirt from entering.

Secure New Glass Unit in Window Frame

Now we‘re ready to install the glass unit into the window frame:

• Check that window frame is clean, in good repair, and ready for new double pane unit. Make any repairs needed to existing frame and sash.

• Apply bead of silicone around the rear edge of the frame where glass will contact.

• Insert the glass unit and gently press into silicone for continuous seal around perimeter.

• Consider adding insulation like fiberglass between glass unit and frame for added efficiency.

• Install interior wood trim pieces with finishing nails for a smooth professional appearance.

• Caulk the exterior seam between glass unit and frame with quality silicone to fully weatherproof.

Optional Enhancements

For even greater efficiency and performance, consider these added steps:

• Gas filled windows – Filling air space with argon or krypton gas improves insulation. Authorized pros can fill on site.

• Low-E coatings – Special microscopic coatings reduce UV light and heat transfer. I recommend DIY film kits from 3M.

• Window films – Apply DIY insulating and reflective films to existing window glass.

• Interior storm windows – Add secondary glazing layer for improved weatherproofing.

Tips for an Effective Airtight Seal

Achieving an airtight, insulated seal is crucial for homemade double pane windows to perform properly. Follow these pro tips:

• Use only fresh, high quality glazing compounds within their shelf life. Old product won‘t cure properly.

• Ensure glass unit edges are completely clean before applying compounds or putty.

• Apply glazing materials in a smooth, consistent layer without gaps or pinholes.

• Use sufficient compound/putty to fill any cracks or spaces completely. More is better!

• Hold window panes together very tightly while glazing compounds fully cure. I use ratchet straps for maximum pressure.

• Inspect perimeter seal and re-apply caulk or putty if any cracking appears over time.

Pros and Cons of DIY vs Professional Installation

DIY Pros:

• Significant cost savings on materials and labor

• Customization and choice of materials

• Great project for skilled DIYers

DIY Cons:

• Achieving professional-grade seal and insulation is difficult

• Improper installation can lead to early failure

• Potential safety risks working with glass

Professional Pros:

• Expert installation for optimal insulation and efficiency

• Access to specialized materials and window technology

• Warranties against defects and workmanship errors

Professional Cons:

• Higher upfront installation costs

• Less customization of materials/styles

Here is a cost comparison between DIY and professionally installed double pane windows:

Window Type	Cost per Window
DIY	$150
Professional Install	$250

Alternative Window Materials

Instead of traditional glass, you can make double pane windows using these materials:

• Acrylic sheets – Shatter-resistant but easier to scratch. Good for basement or garage windows.

• Polycarbonate – Extremely impact resistant. Used for bulletproof windows. Best for high security areas.

• Vinyl – Cheaper option that can mimic the look of glass. Easy to work with and insulate.

• Laminated glass – Glass panes bonded together with a plastic interlayer. Increased security but harder to cut.

• Tempered glass – Treated for increased strength but prone to shattering if broken. Not recommended for DIY projects.

Consider the characteristics of each material before selecting the right one for your DIY project. For most homes, I recommend acrylic or polycarbonate sheets for their durability and easy handling.

Safety Tips When Working With Glass

Glass work poses risks of cuts and injury. Follow these tips to stay safe:

• Wear thick work gloves and long sleeves when carrying glass. Sturdy boots protect feet from dropped panes.

• Use clear eye protection like safety goggles when scoring, cutting, or snapping glass.

• Work slowly and gently when cutting glass to avoid breaking unexpectedly. Rushing leads to accidents.

• Have a helper for moving large glass pieces. Lift together and communicate clearly.

• Keep hands clear of closing windows and use caution around sharp edges.

• Properly contain and dispose of any broken glass shards, which can cause nasty cuts.

Cost Comparison of DIY vs New Double Pane Windows

Here is a cost breakdown for a DIY project with 10 standard 24" x 48" double pane windows:

DIY:

• Glass – 10 panes x $75 per pane = $750
• Glazing materials – $200
• Window trim – $400
• Caulk/sealants – $150
• Total: $1500

New Double Pane Windows:

• 10 windows at $250 per window installed = $2500

As you can see, making your own double pane windows can save over 40% compared to installing brand new windows. Your costs may vary based on your specific project requirements.

Maintenance Tips for Homemade Double Pane Windows

Regular maintenance keeps your DIY windows looking and performing like new:

• Inspect seals annually and re-caulk/putty any gaps or cracks that appear.

• Clean glass 2-3 times per year using a mild dish soap and water solution with soft cloth. Avoid abrasive cleaners.

• Check that window frames are properly painted or sealed to prevent damage from moisture.

• Make sure exterior caulking remains flexible and waterproof. Re-apply fresh bead every 2-3 years.

• Watch for any fogging or condensation between panes, indicating a failed seal that should be repaired.

With the right techniques and high quality materials, you can achieve long-lasting, highly efficient homemade double pane windows. Follow the steps in this guide to enhance your home‘s weatherproofing, comfort, and energy savings through upgraded windows. Let me know if you have any other questions!