I noticed a strange occurrence today, one that I have never observed or heard of before.
We’re framing and using OSB wall sheathing. After breaking the bunk apart and using the top few panels, the OSB was noticeably hot to the touch near the center of the panels.
I did not have my thermometer today, but I would guess the temperature was north of 90°. It was not too hot to touch, but it was definitely warm, warmer than I think I have ever felt wood even when a piece has been in 100° heat and directly in the sun.
The stamp on the panels said 10-21-09, so it’s almost a week old. The weather has not been too cold here recently, but we haven’t seen 80° in the past week and it has dipped down to almost freezing at times during the nights.
Has anyone ever noticed this? I’m wondering if it could still be warm from production? Or maybe there’s some formerly latent chemical reaction occurring?
Any thoughts?
Replies
It's a microwave/radio freq. cured glue, I suspect it's just really fresh. It doesn't continue to cure AFAIK. You just ahve latent heat. At about 1 R per inch, the center can take awhile to cool.
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Back when the local Champion Int. ply mill was open here it was common to get bunks of ply that would feel warm to the touch.
Fresh off the press.
Not OSB but I've had lifts of toasty warm drywall. At least I knew it wasn't from China.
When the Empire State Building was built the steel arrived on site from the mill on such a precise schedule (each truckload had a 15 minute delivery window) that some of it was still warm from the mill in Pittsburgh.
wow were you there ?
Piffen was the foreman"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
LOL!
Man, we could get things done then, huh? What - like 18 months to build it? Less?
Forrest
I wasn't there, but I read a lot about history of technology.
Yes, it was 18 months from the start of design until the first tennant moved in on one of the lower floors.
Being built during the Depression the building lost money for a long time and was not fully occupied until the 1940s.
Living here in the land of OSB plants, I've found that hot OSB is fairly common. It's not the kind of product that sits around in warehouses. It comes hot off the presses onto trucks and out to suppliers. So yeah, it's remnant heat.