In this video, This Old House general contractor Tom Silva helps a homeowner replace a cracked piece of glass, restoring her window’s looks and energy efficiency.

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Tom Silva works with a glass specialist to repair a cracked double pane window. Tom travels to the glass manufacturer to see how the replacement glass is produced.

Difficulty: ⅖ 
Cost: Around $75 (excluding the cost of the replacement pane)
Time: 4 hours

Where to find it?
Tom works with a glass specialist to repair a cracked double pane window. Tom travels to
the glass manufacturer to see how the replacement glass is produced.

To get started the specialist measures the width and length of the glass with a tape measure [https://homedepot.sjv.io/rQEBXy].

An insulating glass caliper [https://homedepot.sjv.io/QyWneo] is used to measure the thickness of the glass. Measurements are sent to a glass manufacturer.

To replace the broken glass, start by removing the sash and lay it out on a flat surface. To
loosen up the trim use a sharp scraper blade [https://homedepot.sjv.io/g1LKRr] and remove with a pry bar [https://homedepot.sjv.io/oqGvRg] and rubber mallet [https://homedepot.sjv.io/y2E3Oy].

To remove the glass from the frame, use a sharp blade [https://homedepot.sjv.io/g1LKRr] to cut the silicone seal.

Once the glass is removed, apply a new layer of silicone [https://homedepot.sjv.io/jrByan] to set in the new glass pane. Use a small rubber mallet to tap the trim back in place, sealing in the glass.

Wear safety glasses [https://homedepot.sjv.io/EKWeAX] and work gloves [https://homedepot.sjv.io/Y90nKO] whenever working with glass.

Assistance and materials provided by Banner Glass Shellmar [https://www.bannerglassshelmar.com/], and Thermal Seal Insulating Glass Inc., Uxbridge, MA.

Looking for more step by step guidance on how to complete projects around the house? Join This Old House Insider to stream over 1,000 episodes commercial-free: https://bit.ly/2GPiYbH

Materials:
Silicone caulk [https://homedepot.sjv.io/jrByan]

Tools:
Cut resistant gloves [https://homedepot.sjv.io/Y90nKO]
Tape measure [https://homedepot.sjv.io/rQEBXy]
Digital calipers [https://homedepot.sjv.io/QyWneo]
Safety glasses [https://homedepot.sjv.io/EKWeAX]
Utility knife [https://homedepot.sjv.io/g1LKRr]
Caulking gun [https://homedepot.sjv.io/GmqMd9]
Small pry bar [https://homedepot.sjv.io/oqGvRg]
Rubber mallet [https://homedepot.sjv.io/y2E3Oy]

Plus, download our FREE app for full-episode streaming to your connected TV, phone or tablet: https://www.thisoldhouse.com/pages/st...

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From the makers of This Old House, America’s first and most trusted home improvement show, Ask This Old House answers the steady stream of home improvement questions asked by viewers across the United States. Covering topics from landscaping to electrical to HVAC and plumbing to painting and more. Ask This Old House features the experts from This Old House, including general contractor Tom Silva, plumbing and heating expert Richard Trethewey, landscape contractor Jenn Nawada, master carpenter Norm Abram, and host Kevin O’Connor. ASK This Old House helps you protect and preserve your greatest investment—your home.

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How to Repair a Double Pane Window | Ask This Old House
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