Use 3-inch deck screws for this part of the job, two screws per board per joist.
From the sfgate.com
The wood will support the subfloor, preventing it from moving down to the joist.
From the thenewstribune.com
It was one wooden joist that caught fire when it was overheated by a steam pipe.
From the en.wikipedia.org
Every lath should be nailed at each end and wherever it crosses a joist or stud.
From the en.wikipedia.org
However, I noticed some floor and joist movement when people walk in this area.
From the dailyherald.com
Do not attempt to raise the old joist or to take the sag out of a support beam.
From the dailyherald.com
If you didn't get the joist the first time, leave the screw there, as a marker.
From the stltoday.com
If the old framing was replaced with a standard joist system, mold may form on it.
From the dailyherald.com
Locate the squeaks in the same way, and then renail the subfloor to the joist.
From the philly.com
More examples
Beam used to support floors or roofs
A joist, in architecture and engineering, is one of the horizontal supporting members that run from wall to wall, wall to beam, or beam to beam to support a ceiling, roof, or floor. It may be made of wood, steel, or concrete. ...
A piece of timber laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed; -- called, according to its position or use, binding joist, bridging joist, ceiling joist, trimming joist, etc; To fit or furnish with joists
(Joists) Parallel beams of timber, concrete or steel for supporting floors or ceilings, etc.
(JOISTS) Horizontal beams laid on edge to support flooring or a ceiling.
(Joists) The main floor framing members of a house.
(JOISTS) The horizontal support for a roof, ceiling, or floor that runs from one wall to another. Larger joists are often known as beams.
(Joists) A small beam. Timbers carrying floors and ceilings.
(Joists) Dimensional lumber set parallel to each other that creates the actual deck structure and rests on beams.