When I was resealing the storm collar on my steel chimney recently, I noticed that it was held to the roof flashing with 2 screws. I was wondering, do chimneys expand vertically when they heat up? If so, should the storm collar be able to move upward w the chimney? Maybe those 2 screws shouldn’t be there. Thanks for your input.
Do chimneys expand vertically?
- Thread starter Bryce250
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Normally the storm collar is not screwed. It is held in place with a bead of good-quality silicone.
Steel expands in all directions when heated but you'd notice it the most along the longest dimension.
It's easy to calculate if you know the temp change. I think you'd get pretty close if you used the average temp over the length of pipe.
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It's easy to calculate if you know the temp change. I think you'd get pretty close if you used the average temp over the length of pipe.
(broken link removed to https://www.metalsales.us.com/thermal-expansion/#:~:text=Each%20metal%20has%20its%20own,steel%20is%200.0000065%20%2F%20%C2%B0F)
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