Tips on Lead Came for Stained Glass
Stained Glass Lead Came Made Easy
Stained glass lead came comes in 6ft lengths sold in single lengths or boxes or in spools which have to be unwound and stretched before use.
There are many different widths and depths and a bewildering array of profiles or ‘sections’ – for example, the most commonly used round, flat, H and C to the specialist Colonial.
Traditionally, 1/2″ (12mm) flat lead is used for the edges of leaded stained glass windows, as it gives you 3/16 ” (5mm) leeway on each side for any errors in the measuring/fitting process.
Getting to Grips with Came Sizes
It’s very easy to get confused with all the different measurements – the width, the channel, the heart – they are all equally important but mean distinctly different things. This diagram is of an Flat ‘H’ profile on its side, as this is how we use it in stained glass. It will help you understand which bit is which and will give you the confidence to be able to order lead for your project.
- A = The Height. This is the total thickness of the section from top to bottom
- B = The Leaf, the Flange or the Face. This is what you see as the ‘lead lines’ when you look at a stained glass panel
- C = Leaf, Flange or Face thickness. This is can be rounded or shaped, depending on the profile.
- D = The Heart or the Channel. This is where the glass slots in. If you have very thick or fused glass you might need a high heart lead.
- E = The Heart Thickness. This goes in between the glass pieces and determines how strong the lead is. If you want to strengthen your panel you might want the heart to contain a steel core.
Stained Glass Lead Came Tips
- Remember that the main reason for choosing a particular lead is the best one – how it will look in your stained glass window design.
- Stained glass lead came with a round profile is better for leading curved shapes, as it doesn’t pucker up like the flat lead does.
- Wide heart lead is higher than standard came, and useful for plated glass (two pieces leaded together on top of each other) and for antique sheet glass that is irregular in thickness.
It’s also useful if you’ve slumped your piece and it’s a bit uneven. I’ve also used wide heart lead when I wanted to increase the strength of the panel, as you can cram in more cement.
- Biased lead is used to join two parts of a large panel together. The heart of this came is not centered. You put the wider came at the bottom, to increase its ability to keep out the weather.
- Steel cored lead is used for strengthening stained glass panels, and can accommodate slight curves.
- Alternatively, if your design has deeper curves that you want to strengthen, you can buy separate hardened steel wire that is placed next to the heart of the lead when you’re leading your stained glass panel. You can buy it singly or by the kilo (approximately 12 lengths).
To Stretch or Not to Stretch?
I always stretch came but the lead I buy is very pliable and would be impossible to work with if I didn’t. If you buy hard lead you won’t be able to stretch it much and if you buy pre-stretched lead you won’t need to stretch it. So it’s not simple!
Technically, you’re not actually stretching the lead, as stretching can actually weaken the lead came. Stretching (or straightening) the came out gives it rigidity and therefore makes it easier to work with. This increases the stability of the came during the leading process.
It won’t, however, give it any more strength so it’s not essential in a structural sense.
Stretching helps untangle all the kinks that invariably happen how ever hard you try to stop them! This results in more pleasing lines in your leaded panel. But more importantly, if you don’t stretch it before you use it, it will stretch in your project, and you don’t want that.
I often get asked about lead poisoning and can honestly say that none of my blood tests have ever shown any dodgy levels in my system. Having said that, it is recommended that you wear latex gloves when leading, and that you seek medical advice if you are pregnant.
Always read the manufacturers advice before using lead.
To see how to cut and shape lead came when making a stained glass window, go here.
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