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.
semipro
Minister of Fire
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.
www.metalsales.us.com
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.
Learn about thermal expansion and contraction with metal panels
When metal is subjected to a change in temperature, it responds by changing size. For metal panels, it is important to know.
www.metalsales.us.com
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