Truss Uplift and Ceiling Cracks.Truss Uplift and Ceiling Crack TIPSDEAR TIM Cracks have begun to appear where the walls meet the ceiling in the top floor of my home.These cracks are most prominent along the walls in the center of the house.Ive also noticed that the baseboard has lifted up from the floor in other places.These cracks seem to close up on a seasonal basis.Sturdy, prefabricated wood trusses were used to build my roof.Whats happening What if anything can be done to prevent the unsightly cracks Ben Traverse City, MIDEAR BEN There are a multitude of things that can be causing these cracks.Trusses Move. The first thing that comes to my mind is a phenomenon called truss uplift.Although truss uplift causes approximately 2.I get asked this question all the time.So lets talk about this bc it can be pretty distressing when a crystal cracks.Im excluding weak, easily broken. Manual De Construccion Con Yeso Pdf Download more. Undersized beams, expansive clay soils, wet floor joist lumber that shrinks, and other structural problems also can cause the cracks you see.CLICK HERE to get FREE FAST BIDS from local rough carpenters that can crawl around your attic to fix truss uplift issues.Flat Bottom Chord Curves.Most simple roof trusses consist of a flat horizontal member called a bottom chord.The sloped portions of the truss that form the roof surface are called the top chords.However, the bottom chord can develop an upwards curve as the seasons change.Temperature Humidity Battle.The bottom chord in your house and many others like yours is probably buried in insulation.Because the truss is touching the warm ceiling drywall below and the temperature of the insulation close to the ceiling is far warmer than the attic air temperature, the wood truss is none too happy.Meanwhile, the upper portion of the truss is exposed to cool and drier attic air.Since wood is a hygroscopic material, any of the wood that makes up the truss thats exposed to the air in the attic releases moisture in the winter months.The bottom chord thats buried in the insulation tends to have a higher moisture content because it thinks its much warmer in the attic than it actually is.The head louse Pediculus humanus capitas DeGeer, the body louse Pediculus humanus humanus Linnaeus and the crab louse Pthirus pubis Linnaeus all occur on.B6/data.tumblr.com/tumblr_mc7jigwBRl1qm6vcho1_500.gif' alt='My Head Cracks When I Move It' title='My Head Cracks When I Move It' />
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