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Effects Of Temperature Change On Wood...

Posted by Dodgeman on January 3rd, 2002 01:06 PM
In reply to Truss Heave by Dan on January 2nd, 2002 08:11 PM [Go to top of thread]

Wood, (I'll use pine as an example) expands or contracts along the direction of the grain approximately 0.000003 inches per inch for every degree F temperature change. The bottom chord of a roof truss is usually about the same temperature as the inside of the house because the insulation is over the top of it. The top chords of the truss cool to near outside temperatures. Calculations show that a difference in temperature of 100 degrees would result in the top chords pulling the edges of the ceiling apart approximately 1/8 inch for a 30 foot span. Moisture content of the wood also has an effect. I don't know of any cure for this. It's a matter of physics.
Good luck!

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