Floor live load of 40 psf between the kneewalls.
Decorative wood between floor joists ceiling.
Ceiling board allows you to heat your room far more efficiently.
You would be able to check if this is the case in your home by going up into the attic.
Bonus room floor joist selection guide.
In general floor planks should be installed perpendicular to the ceiling joists although the presence of a plywood sub ceiling or a layer of perpendicular furring strips will allow you to install parallel to the joists.
Adjustable galvanized steel joist hanger tab 6 piece per box.
For other conditions including holes use fastbeam software or call georgia pacific at 877 437 9759.
Attic and floor dead load of 10 psf.
For finished ceilings first disconnect the electricity and remove all light fixtures and other obstacles.
Floor covering is the aptest description since everything below the substrate can be considered the real floor in terms of structure and permanence.
Straight gable roof framing is assumed for selection table.
Floor joists and ceiling joists serve similar purposes.
Unless you have a finished attic the ceiling joists are typically exposed.
Ceiling drywall hides the unpainted unfinished wood of joists beams or the floorboards supported by the beams plus a lot of other junk detailed below.
Generally floor or ceiling joists run parallel to the rafters.
You may need to lift insulation or plywood to see the joists.