If you are referring to the type of stairs that pull down, here is one way to do it.:
In addition to what you see in the video, I have flexible weather stripping all along the bottom edge and I use velcro straps to hold it down tight.
Are they pull down stairs? This will help: https://www.youtube.com/watch?v=4mGCZNpkQ3w
How to Insulate and Air-Seal Pull-Down Attic Stairs
There is some good information here:
Here's a diy guide for you:
Hello, hope this helps you out,
If the are pull-down stairs, you can build a box to go over the opening and line it with foam insulation.
Hi! We bought a cover like this. It works great!
Hi this is Peggy. I hope this helps you insulate your attic stairs. How do you insulate attic stairs?
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There are kits available. You could build a cover that lifts away and still has room for the ladder to fold up. Us the rigid foam insulation, cut pieces to size, and glue together with a tube of construction adhesive. I have never had stairs. My garage access was an access hole with a piece of sheetrock that fit in. I attached insulation directly on the panel top side.
Here's a post that might help - https://www.greenbuildingadvisor.com/article/how-to-insulate-and-air-seal-pull-down-attic-stairs
Hi Ladder Hunt: One Christmas my kids got me attic pull down stairs. I love them! What I put on them for insulation is that foam that you can cut. It's about 18" wide and 4' long, so you have to do a bit of piecing. It's not as heavy or as messy as that fibreglass insulation, and comes in different thicknesses. I really like it:) You can either glue it down or use double sided tape. I glued mine, I used regular Elmers white school glue and a paint brush. It's been up there for about 25 years, so I think that worked :) Good luck
I used a spray insulation
I don't know if you have the pull down kind or not, but here is a nice video tutorial for you: https://www.youtube.com/watch?v=ohNci5wUv74
You can either use spray insulation, or put insulation batts up. Then cover it with poly and tape your seams