stairs
Hills get cut using the following procedure:
When earth is cut deeply enough, stairs get formed.These stairs, which have front walls and back walls, need to be braced. The obvious choice for a brace is pressure treated wood with rebar running through it and into the earth.
Can composite wood, the wood used for decking, also be used for a brace?
A few options.
1 - Grip/tread tape (easy/cheap but maybe ugly):
2 - Rubber treads (modern/industrial look):
3 - 'tread/grip' additive for paint (easiest to 'blend in' to decor):
3b - DIY 'tread/grip' additive:
There are special screws for squeaky wood floors. You drill a small pilot hole, drive in the special screw and the head of it breaks off. The screw pulls the offending pieces together eliminating the squeak. You will want to try to screw into the stringers for the best result. With the head broken off a small hole remains that can be filled. If you have large gaps between the treads and the risers you may want to get some wood glue in the gap prior to installing the screws.
Best Answer
Composite wood is not usually rated for structural uses. Whether this is structural or not is debatable, but you'd likely need to drive more rebar if you opt for composite boards to prevent buckling.