How is the glass actually attached??

[Davidw]

I'm about to put up the glass in my wooden greenhouse. I've been pondering for a long time how to keep them from sliding down, but those I've asked haven't been able to answer. Of course, I could put in a couple of screws or similar as a stop at the bottom, but I'd prefer if it wasn't visible. Like the attached pictures. Does anyone know how to fasten glass here? Is the pressure from the strip enough? They can't have glued and held them still, that doesn't seem period-appropriate either.
Grateful for any help!

 

[Davidw]

My greenhouse will mostly resemble the lower image, I have also attached a metal sheet (glued, preferably not screwed) over the wall plate as that image also shows.

 

[Davidw]

Found another picture, here too no "pins" are visible holding the glass at the bottom.

 

[justusandersson]

Sealing strips both above and below do the job. Glass must not be held clamped, as it will crack immediately.

 

[Davidw]

Sealing strips both above and below fix the job. Glass must not be held under tension, as it will crack immediately.

Do you mean rubber strips? And then they are pressed tight when you screw the strips in place?

Any specific type of strip you can recommend? My dad thought I should just use silicone underneath.

 

[Davidw]

The images that should have been included. Note how on the airing vent there doesn't seem to be any strip pressing on the glass in any place. Glued?

 

[justusandersson]

Common rubber sealing strips with a rectangular cross-section and adhesive on the back. No O-profiles or similar. Glass is quite sensitive to stresses and needs to be able to move freely. Silicone certainly works, but it becomes troublesome when you need to replace a glass pane. All factory-made greenhouses I have seen have some form of rubber strip that the glass rests on. Metal never has direct contact with glass.

 

[Davidw]

Found this u-rubber strip. Might be the best option. A bit worried that silicone creates tensions (removing them I'm not super worried about) when it's completely rigidly glued to wood that fluctuates over the seasons.
What risks do you see in that?

 

[justusandersson]

If you can place such a strip around the entire glass edge, it must be perfect. The difference in movements between glass and, for example, wood, is significant and a source of problems. My parents-in-law had a greenhouse where the glass on one side was held in place with a metal clip. Over the years, I probably had to replace every pane at least 2 times. So a rubber strip (or two) that holds the glass in place with the help of friction is the safest.