Full size attic ladders usually need an opening in the ceiling that is at least 22 1 2 x 54 inches.
How to build a wooden attic ladder.
Basic space requirements for an attic ladder.
Homemade attic ladder with 4 sections.
Cut one of the halves again but this time divide it up so that you have 2 3 of the ladder in one piece and a smaller piece.
Easy steps diy staircase.
You can build the ladder in two or three pieces and put it together afterward or cut it after it has been built.
Measure the width of the attic frame piece to tap another nail by the same joist in the ceiling.
How to build stairs.
Fit the ends of the 18 inch two by fours into one of the notched two by fours to form half the ladder.
Build the ladder on its side.
Place the notched pieces face up across two sawhorses.
Also make sure there is a suitable landing space in the attic so you can safely mount and dismount the ladder while carrying items.
Apply wood glue to the notches.
Go up to the attic and with a hammer tap a nail through the ceiling by the joist as a starting place to cut your rough opening.