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metal roofing question

R

Ray IN

Member
If you install long sheets of metal on a shed when its cold out, it there any problem with it expanding too much next
summer in the hot? Just never build much in winter before.
 
How cold is cold to you . It was -20f last night here. No body around here was doing roofing as the wind alone made it impossible. Since you are asking questions like this you must be in Kentucky or Tennessee. If you are using screws and putting them in the ridges [high spots} I don't foresee any problems --- as cold to you would be around the freezing mark .
 
(quoted from post at 14:52:10 12/24/17) If you install long sheets of metal on a shed when its cold out, it there any problem with it expanding too much next
summer in the hot? Just never build much in winter before.
Click to expand...
bout the same as a 'contraction problem', during the winter , if installed during heat of summer. i.e., none expected.
 
Yes you are very close--southern Indiana. And its starting to snow now, so I cant do anymore today.
 
If your annual temperature swings are from 0 to 100 then 50 would be a neutral temperature. 40 or 30 are not far off.

However you are worrying about an unnecessary problem.
 
Here in E SD we put the screws next to the ridges. Seems the contracting of the ridges would loosen the screws and esp. lead head nails. Still screw the ridges if next to the roof edge so wind doesn't lift them.
 
I had part of my house reroofed with metal. Got to save some money to finish the job. The installers would not put the screws in the ridge like I wanted. After they finished, they told me screws in the flats were not a problem if replaced every 15 years. I was furious.
The rest of the house will be in the ridges.
Richard
 
Biggest concern is slipping and falling -- sounds dumb -- but falling off a roof could end you life or change it dramatically . Using a safty harness is a pain but just consider what would happen if you slid on a icy patch not only to you but your family. Wearing snow boots and working with gloves is awkward at best. I would consider a scaffolding with a platform at the roof edge so that at least in your mind you cannot really fall any where.
 
I have wondered about that too, on the really big sheds do they put one piece steel on each side of the roof? I think some big sheds are 48 feet wide so that roof steel would have to be about 26 feet. On our cabin in N MN we put one piece 24 foot sheets horizontal on the N side, I should loosen some screws next summer and see if the holes are slotting. It goes from -40 to +100 F there! I tried to find out how much steel shrinks but I can't find a simple chart, but with a 100 foot tape you have to add about an inch at -30. I remember doing carpenter work outside when it was -30 F!
 
What are you calling long? What is on top of the trusses or rafters (is it sheeted solid or are you using purlins)?
 
I don?t think there are any issues, many steel roofs put on in all kinds of climates and I have nevert heard of that being an issue. I think the screws or nails allow just enough movement to keep it from buckleing. Where is George from TH? He would straighten this out, Lol! My apologies come on back we miss you!
 
(quoted from post at 13:52:10 12/24/17) If you install long sheets of metal on a shed when its cold out, it there any problem with it expanding too much next
summer in the hot? Just never build much in winter before.
Click to expand...

A 50 foot piece of steel will expand .456 inches with a 100* F temperature rise,
 
I think the ridges formed into the flat sheet at time of manufacture are your temp compensators, just like the new easy open cans of veggies and fruits (no can opener needed) have corrugated sides for the same reason. I have a 1981 Morton Building that has never leaked to this day put up with rubber gasketed roofing nails.
 
You are exactly right. The ridges help with expansion. This is why many builders have gone from putting the screws on the ridge, to on the flat. With the ridge "working" with thermal expansion, it could (and will) loosen the nails/screws.
 
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