Glass expansion - all depends on what sort of seal you need, compliance of materials, temperature extremes and differences.
The coefficient of thermal expansion (CTE) is a critical parameter for glass seals since they must expand and contract at the same rate as other materials.
mo-sci.com
To seal pins in a vacuum tube, a glass frit seal is used, and the metal is Inconel. Seal rings on packages are Kovar.
I broke a car windshield by just aiming water stream from a garden hose on it.
Windows of buildings are installed in aluminum frames with silicone.
PV panels have silicone holding glass to aluminum frame, which can then wobble on its base. I always keep a slight spacing between frames.
If trying to use tempered glass PV laminates as roofing material, you need to place multiple panels in a way that sheds water and allow their expansion/contraction relative to structure underneath. Don't tile them side by side without any gap between the glass of each.
"An increase of temperature by100°C causes an expansion of approx. 1,0 mm/m"
That is 10 ppm/degree.
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Aluminum is about 20 ppm/degree.
If glass was mounted edge touching edge in hot weather then taken cold, the panels would get shoved together a fraction of a millimeter, could buckle or break. Putting them down 1mm apart on top of 1mm silicone might be good. (of course the bottom of the laminate is Tedlar or similar.) Overlapping about 1 cm would be better for shedding water even if a split developed in the seal, so you don't rely on silicone to keep the house dry.
