Truss uplift or truss lift is when the wood in wooden

truss A truss is an assembly of ''members'' such as beams, connected by ''nodes'', that creates a rigid structure. In engineering, a truss is a structure that "consists of two-force members only, where the members are organized so that the assembl ...

es shrinks, or cures, and the bottom most piece bows upwards, most notably near the middle. Truss lift is an issue in wood-frame construction where non-load bearing walls meet ceilings, as the truss lifts it pulls the ceiling

drywall Drywall (also called plasterboard, dry lining, wallboard, sheet rock, gypsum board, buster board, custard board, and gypsum panel) is a panel made of calcium sulfate dihydrate (gypsum), with or without additives, typically extruded between thic ...

up. This in turn pulls the angle tape out of the corner and can damage the spray texture. One solution is to not fasten the ceiling drywall within two feet of a non-load bearing

wall A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including: * Walls in buildings that form a fundamental part of the sup ...

, and rather use the drywall on the wall as support. This technique will allow the ceiling board to bow down and stay tight to the angle over time as the truss lifts.

References

Roofs Ceilings Fasteners Woodworking {{civil-engineering-stub