You potentially compromise too many of the rafter cross ties by doing that.
Installing attic stairs perpendicular to joists.
Use a reciprocating saw to cut joists and nails holding any joists that must be removed.
Ladder we use the floor and reinstall the stairs if this video from bunnings warehouse will have a qualified professional if the joists are perpendicular to be used to the opening lenght framed with single headers installation.
Determine the area where you want to place your stairs.
When you find it remove the insulation from the area and determine.
If the room has no ceiling.
Snap a chalk line between the two nails image 2.
Next using an electric drill pop a screw up through the drywall in the ceiling.
Measure 54 inches and tap the second nail next to the same joist image 1.
The middle of the load that it is any cut and people walk on the rafters or level to the joists even a good rule of the rope on those joists you want to simply be very heavy you may include items.
Instead you should place the cutout opening inline with the ceiling joists rafter ties.
Using a carpenter s square line it up from the point of the nail and draw out 22 1 2 inches.
Cutting and bracing a new hole.
Installing attic ladder perpendicular to joists.
Do this on both sides image 3.
Cut 2 joist sized boards long enough to span two joists on each side of your chosen.
That is a narrow hallway but the ladder would need to be installed perpendicular to joists.
Standard joist spacing for the installation of attic flooring materials is 16 inches on center oc meaning the distance from the center of one joist to the center of the next joist is 16 inches.
Mark rough opening of new fold down staircase on the ceiling joists in the attic.
Werner s easy access attic ladder 5 cut ceiling joists step 1 mark.
Learn how to install this attic ladder with a complete installa.
It is an old house 1899.
Cut around ceiling trim with a utility knife.
Step 2 cut joist support boards.
If the room has a ceiling and you have cut the required hole go to step 2.
Once you re in the attic locate the screw.
I only have one area in old house on the 3rd floor where i can put a pull down attic ladder.
I would not put the attic stairs ladder assembly opening at right angles to the ceiling joists.
This way you only need to cut one of them to make the room for the rough framing opening.