Beautiful reinforced stained glass window
Restoration - Techniques

Reinforcing Stained Glass

Reinforcing Stained Glass

Stained glass windows are filled with bright colors and beautiful designs. People have treasured them for generations. They make churches and buildings look remarkable. But, because glass can break easily, we have to be careful to make sure they can stand the test of time. This post talks about the best ways to strengthen stained glass art of all sizes, so they can be enjoyed for many years to come. Join me as we learn how to reinforce and add structures to keep things looking good for a long time.

When to Reinforce Stained Glass Windows

Stained glass windows are beautiful but easily damaged. They sometimes need maintenance and care to last longer. In this section, I’ll talk about the signs that point to the need for extra support, when to fix them and how to stop bending or sagging.

Signs that Stained Glass Needs Reinforcing

Bending Windows: If your window bends in or out, the weight of the glass needs more support – before it breaks.

Loose or Missing Parts: Changes in weather, impacts and age can make parts fall out. If pieces are missing or loose, your window needs fixing.

Cracks in the Metal Lines: The lead parts holding the glass can get cracks. If you see more and worsening cracks, it’s time to fix it.

Noisy Windows: If your window makes a creaky sound when touched or when it’s windy, it needs checking.

Old Windows: If your window is very old and hasn’t been fixed in a long time, it’s good to make it strong again before any more problems come up.

Read this post on repairing stained glass for great tips and information (link to post).

Preventing Bending and Sagging of Stained Glass

Check Your Windows Often: Look over your colored glass windows regularly. Fixing little things right away can stop bigger issues like drooping.

Check the Fit: If the window wasn’t set up right, parts of it can get stressed. Make sure it is supported evenly on all sides.

Prevent Outdoor Stress: Use outside glazing or storm windows to keep your colored glass safe from bad weather like hail, wind, and large temperature changes.

Add Supports for Tall Windows: For high windows, add metal bars as supports to stop them from drooping. These help spread the weight of the window.

Stained Glass Rebar Installation

Strengthen Weak Spots: Like we said earlier, adding strength to spots that hold a lot of weight can stop the window from bending.

Stained glass windows are beautiful and lasting, but they do get old. Knowing when they need some love and giving them what they need can keep them shining bright and looking great for many, many years.

Methods for ReinforcingĀ Stained Glass

Stained glass is beautiful art, but sometimes needs extra support to make it last. The trick is to know the different ways to do this and pick the best one. Let’s look at some common ways to get this done:

Strong Line Internal Steel Strips

Strong Line is a thin coppered steel strip used to strengthen your stained glass panel from the inside. They go inside metal channels or are pushed between colored glass pieces before adding solder. Re-strip is another brand made all of copper, but Strong Line steel strips are stronger.

Using Rebar for Support

Rebar is just a strong steel bar we use for big stained glass windows. We put these bars up and down or side to side on the window. This helps spread out the glass’s weight, so it doesn’t sag or break. We attach the bars to the glass with solder or ties and hide them in the frame, so it still looks good.

Reinforce Hinge Points

Some areas of the window can break more easily because of how the weight is distributed. Find these points and make them stronger. Do this by adding heavier leading, using rebar, or adding other support right where it’s needed.

Using Copper Wire

Copper wire is bendable and strong, making it great for giving small stained glass pieces extra hold. Twist or coil the wire and attach it to the glass’s metal lines to help hold it all together.


Re-strip and twisted wires are another way to strengthen stained glass. Both are thin and can be put inside lead strips or between foiled glass pieces before soldering. After they’re set, you can’t really see them, but they give the glass a lot more strength. This way, even very detailed glass pieces can have extra rigidity without changing how they look.

Check details and pricing of Re-strip here on Amazon (link to Amazon)

Small Glass Art Like Suncatchers

Big stained glass is eye-catching, but smaller pieces like suncatchers are pretty too. They’re great for beginners and make nice gifts. But even these small pieces might need some extra support to last longer.

Using Wire or Chains for Edges

Putting a wire or chain around the edge helps hold things together. With pliers, wrap the wire tight and melt metal over it to stick. For chains, add little metal rings to the edges and run the chain through them.

Add Support Wires Inside

For pieces that might bend, adding short wires across weak spots makes them stronger. Pick the thinnest wire that still helps.

Using Jewelry Parts

Things like small rings or pins from jewelry can help hold the glass when melted to the sides. Copper or brass is better than nickel.

Frame Backing

Think about putting a frame made of wood, metal or plastic around small things like suncatchers and ornaments. This helps them last longer and makes hanging them up easier.

Thicker Solder Lines

Put more melted metal on spots that might break. Doing this really well can make pieces stronger on their own.

When making small glass art, think about adding support from the beginning. A spectacular small piece can last a long time if we add things like thin wires or edges to the design. Even small glass art should last a long time. With a little extra help, they can keep shining brightly for many years.

Using Hobby Metal Edges

Hobby came is like a metal frame usually made of lead or zinc. It’s great for giving stained glass extra strength. When put around the edge of stained glass, it holds everything together and makes it stronger. This frame doesn’t just make the glass last longer; it also makes it look even better.

I have an expansive post on using Hobby Came in smaller pieces found here (Link to post)

Step-by-Step Guide to Making Your Stained Glass Stronger

Stained glass, especially the big pieces, can sometimes droop or break over time. But if you make them stronger the right way, they’ll stay solid for a very long time. Here’s how to do it:

Decide if you need extra support:

If your glass piece is bigger than 2-3 feet square, you’ll probably want to make it stronger. If it has lots of straight lines, it might droop and need some help too.

How To Reinforce Stained Glass Using Restrip V293

Pick the right material to make it strong:

Metal strips: These are like strong frames for the glass.
Copper wire: This gets put into the solder lines to help hold things together.
Rebar: This is the big, tough metal bar that you attach to the panel.
Re-strip: These are thin metal pieces that go between the glass.

Plan where to put it:

It’s best to think about this when you first start your glass art. Put the strength where the glass might break or droop.

Get your materials ready:

Cut the wires, metal strips, or bars to the right size for your piece. If you’re using copper, you might need to pre-tin it first. And if you’re using big metal bars, you might need to bend them to fit.

Put the strong stuff in as you go:

As you’re building your glass piece, add in the reinforcing bits. For the big metal bars, attach some copper wires to the glass first for attaching the bars when the piece is done.

Attach everything tightly:

Metal bars, if used, should stick out a bit past the glass edge. Attach or solder the ends to the frame to lock everything in place.

Solder everything together:

Once you’ve got all the reinforcing bits in, just keep going like normal with final soldering.

Making your stained glass stronger helps it last a long, long time. Think about this early on, and with some planning, everything will fit just right and look great!

Making Big Stained Glass Windows Strong

Big stained glass windows are beautiful, but they can be weak because of their size. We need to make sure they don’t bend or break easily.

Problems with Big Windows:

Weight: The bigger the window, the heavier it is. This means more weight pushing down.
Bending: Wide windows can bend if they aren’t made stronger.
Thick strips: Big windows need thick strips to hold them. But these strips can hide details.
Hard to fix: If something breaks in the middle, it’s hard to reach and fix.
Big size: Some art studios are too small for big windows. So, artists might have to work on-site or somewhere else.

Reinforcing Stained Glass Windows with Steel Bars

How to Make Them Stronger:

Metal Frames: Use brass or zinc frames around the window. This makes it strong.
More metal strips: These divide the window and add strength.
Rebar: These are strong metal bars that stop the window from bending.
Copper wire: This wire helps hold the window in place.
Metal strips: These are put into the window to make it stronger.
Thick solder: This is like glue for the window. Making it thicker can help.
Patches: These are like band-aids for weak spots in the window.

With the right steps, big stained glass windows can be beautiful and strong for many years.


Stained glass windows are very beautiful but fragile. Over time, the glass can bend and sag. To keep stained glass looking great for many years requires smart construction methods that include support. Supports can be made of came, foil, rebar, or wire to hold the glass in place. With proper supports, even big and complex stained glass pieces can last for generations.

Our work as caretakers is as important as the original craftsmanship. Together, we can keep the tradition of this stunning artform alive.