# steel roofing:

**URL:** <https://forums.speedlife.net/t/steel-roofing/37451>\
**Category:** NYSpeed Off Topic\
**Created:** [October 23, 2007, 6:26am UTC](https://forums.speedlife.net/t/steel-roofing/37451 "2007-10-23T06:26:50Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\
**Post date:** [October 23, 2007, 10:26am UTC](https://forums.speedlife.net/t/steel-roofing/37451/8 "2007-10-23T10:26:27Z")

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This is going onto my parents garage first off.  
The metal sheets do snap together, and the screws/nails go under the snap lid things.  
Why will the fasteners back out, due to thermal expansion of the metal? I don’t see the metal flexing more then a small fraction of an inch over even 100 degrees…what am I missing here that causes the downfall of a metal roof?

This is material only, and not exposed fasteners. I will be doing the labor. Enlighten me to my downfalls!

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