If you have AC that controls both temperature and humidity, then movement should be less. Humidity and temperature work together to swell and shrink wood. The warmer the air, the more moisture it can hold and the more moisture wood will absorb expanding the cells of the wood. Wood also expands much more across the grain than with the grain. This is why plywood is more stable because the grain of the laminations are perpendicular to each other restraining expansion in the cross grain direction. Ben Trousdale
--- In [email protected], "Bill Lane" <bill@...> wrote: > > I was the one that started the "growing pains" topic. Luckily my baseman > does not vary much in temperature - maybe 10 degrees. Right in the middle of > the basement is a duct vent tied into the main house HVAC zone so that > basement gets whatever the house is getting in air movement. There is > surprisingly not much of a musty spell - ever - so I guess the humidity is > pretty stable. > > > > I think/hope that using the 12 ply birch plywood exclusively for the frames > will help out greatly in wood expansion and contraction issues. > > > > Thank You, > Bill Lane > > Modeling the Mighty Pennsy & PRSL in 1957 in S Scale since 1988 > > See my finished models at: > <http://www.lanestrains.com/> http://www.lanestrains.com > Look at what has been made in PRR in S Scale! > > Custom Train Parts Design > <http://www.lanestrains.com/SolidWorks_Modeling.htm> > http://www.lanestrains.com/SolidWorks_Modeling.htm > > PRR Builders Photos Bought, Sold & Traded > (Trading is MUCH preferred) > <http://www.lanestrains.com/PRRphotos.xls> > http://www.lanestrains.com/PRRphotos.xls > > ***Join the PRR T&HS*** > The other members are not ALL like me! > <http://www.prrths.com/> http://www.prrths.com > <http://www.lanestrains.com/PRRTHS_Application.pdf> > http://www.lanestrains.com/PRRTHS_Application.pdf > > Join the Pennsylvania Reading Seashore Lines Historical Society > It's FREE to join! <http://www.prslhs.com/> http://www.prslhs.com > Preserving The Memory Of The PRSL > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
