removed some metal T system drop ceilings now I want sheetrock but not sure best way to run ceiling joists across 15' room if I go with 8' 2x4 how do I tie them together towards center of room to prevent slag Edit if room is only like 14' can I just run a 15' 2x4 across span of room or do I have to buy engineered joists even though only weight I'll be making them hold is sheetrock
closed as unclear what you're asking by isherwood, Chris Cudmore, ThreePhaseEel, mmathis, Daniel Griscom Jan 23 '18 at 0:13
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To span 14' or more with a ceiling joist with an uninhabited attic with no storage, you need 2x6s or larger. If you want something smaller, you need an engineeered product rated for the span.