I believe it's still in tact because the key hole is allowing the water to come through so the pressure isn't entirely on the glass door. Anyone else what to chime in??
I disagree. Imagine you have a balloon with a pinprick in it before it was inflated (it won't "pop" ever, but it can rupture further because of a weak point). You get an air blower device and start pumping air into the balloon. The air escapes from the hole yes, but air enters at a much faster rate causing the balloon to expand (more pressure), and eventually the balloon will tear at the weak point and just open up into a rubber flab over a compressor nozzle.
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I don't know the physics of glass or how it can be treated (because I spend more time internetting about steels instead) so I have no other explanation.
The glass is reinforced and the door itself is likely either aluminum or steel which can both withstand a good bit of pressure before failing. But I would be nowhere near that door when it does fail which is probably very shortly.
Water pressure get higher as the depth of the water increases i.e. the bottom of the door has a much higher pressure than the middle of the door. Water leaking through the door does not help with relieving water pressure. I guess the reason why the door can hold up well is because you have to push to open. What surprises me is actually how "waterproof" it is.
I think it's still intact because the water is still and there are no currents against the door, so the pressure against it is not strong enough to break the door.
The water hasn't flooded in yet because of the door and the glass. The door is a aluminum patio door. There are very wide and very thick. It disperses the force being pushed against it. Number 2 what floor construction if you look the door sits lower than the floor. Which means the door has something bracing it. Number 3 those doors are not Harl hollow. There are actually two solid pieces join together. The glass is not normal glass. It's tempered glass and also it's not just one sheet it's too. The other thing about the two pieces is they are not touching. And there is a bit of space between them. This is allowing the glass to move a little bit when the temperature changes. Lastly there's multiple layers of weather stripping in the door and in between the doors. It's designed to keep out moisture and to prevent air flow. Oh and before I forget both doors are taking the pressure from the water pushing against it so it's nicely dispersed. I have installed these type of doors.
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I don't know the physics of glass or how it can be treated (because I spend more time internetting about steels instead) so I have no other explanation.
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