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> Windshield Installation:, Things to Note
bbrock
post Oct 28 2022, 07:48 AM
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QUOTE(nivekdodge @ Oct 28 2022, 07:38 AM) *

I’ve been been reading a lot of these glass install posts. Non of them give a reason for using butyl other than “that’s the way we’ve always done it”. Does anyone have a concrete reason why you would use 50 year old tech?


Surprised you didn't come across this in other threads as it comes up quite a bit, but the reason is because our cars flex and urethane doesn't. Quite a few reports of people having their windshields crack after installing with urethane.
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914werke
post Oct 28 2022, 10:32 AM
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(IMG:style_emoticons/default/agree.gif) These cars were flexi-flyers when new (especially with the top off) 50 yrs later & untold # of miles on their chassis's... that is even more so.
Butyl was designed to never harden completely. So it always provides a bit of give to accommodate cowl shake & body twist.
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mepstein
post Oct 28 2022, 02:22 PM
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Yea. People want to modernize the install and the glass cracks and then they blame the glass.
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nivekdodge
post Oct 28 2022, 02:51 PM
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Thanks guys

Kevin
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Robarabian
post Oct 28 2022, 07:21 PM
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It flexes. The urethane of today's cars is very rigid. The 914 is a very flexible car so the butyl allows the windshield to have some give when the car flexes. There are stories that with urethane, the windshield is more prone to cracking.

That being said, there are members on here who have used urethane and not had a break.




QUOTE(nivekdodge @ Oct 28 2022, 06:38 AM) *

I’ve been been reading a lot of these glass install posts. Non of them give a reason for using butyl other than “that’s the way we’ve always done it”. Does anyone have a concrete reason why you would use 50 year old tech?
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bkrantz
post Oct 28 2022, 08:04 PM
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QUOTE(nivekdodge @ Oct 28 2022, 07:38 AM) *

I’ve been been reading a lot of these glass install posts. Non of them give a reason for using butyl other than “that’s the way we’ve always done it”. Does anyone have a concrete reason why you would use 50 year old tech?


The common explanation is that butyl tape provides a bit more give, so as the windshield frame flexes, the glass is less likely to crack.
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930cabman
post Nov 2 2022, 05:07 AM
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QUOTE(bkrantz @ Oct 28 2022, 08:04 PM) *

QUOTE(nivekdodge @ Oct 28 2022, 07:38 AM) *

I’ve been been reading a lot of these glass install posts. Non of them give a reason for using butyl other than “that’s the way we’ve always done it”. Does anyone have a concrete reason why you would use 50 year old tech?


The common explanation is that butyl tape provides a bit more give, so as the windshield frame flexes, the glass is less likely to crack.


exactly, something like cement mortar vs lime mortar in masonry construction. The more "flexible" lime mortar wins out everytime in historic buildings.

Rigid is not always a good thing
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VaccaRabite
post Nov 2 2022, 06:00 AM
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I've had my windshield glued in with urethane now for over a decade, no cracks. I think that problem is likely overstated.

Zach
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930cabman
post Nov 2 2022, 06:25 AM
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QUOTE(VaccaRabite @ Nov 2 2022, 06:00 AM) *

I've had my windshield glued in with urethane now for over a decade, no cracks. I think that problem is likely overstated.

Zach


Yes, but it is glass and 3mm or so in thickness, two lites of course
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